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19-3317; Rev 1; 1/05
MAX5940B Evaluation Kit
General Description
The MAX5940B evaluation kit (EV kit) is a fully assembled and tested surface-mount circuit board featuring an Ethernet port, network powered device (PD) interface controller circuit for -48V supply systems. The EV kit uses the MAX5940B IEEE 802.3af-compliant network PD interface controller in an 8-pin SO package. The MAX5940B EV kit can also evaluate the MAX5940D rated for an absolute maximum input voltage of 90V. The MAX5940B features an internal isolation switch that limits inrush current. The MAX5940B is used in powerover-LAN applications requiring DC power from an Ethernet network port for PDs such as IP phones, wireless access nodes, and security cameras. The MAX5940B EV kit receives power from an IEEE 802.3af-compliant power sourcing equipment (PSE). See the MAX5922 and MAX5935* data sheets for PSE controllers. The PSE provides the required -44V to -57V DC power over an unshielded twisted-pair Ethernet network cable to the EV kit's RJ-45 jack. The EV kit features a 10/100BASE-TX Voice-over-IP (VoIP) magnetic module and two diode bridges for separating the DC power provided by an endspan or midspan Ethernet system. The EV kit demonstrates the full functionality of the MAX5940B such as the PD detection signature, configurable PD classification signature, programmable inrush current, and undervoltage lockout (UVLO). All of these features are configurable on the EV kit and additional test points for voltage probing and interfacing have been provided for the PD interface. The MAX5940B EV kit also features a galvanically isolated 6W, 275kHz switching frequency flyback DC-DC converter, which uses the MAX5014 current-mode PWM controller. The MAX5940B's -48V output provides power for the converter circuit. The DC-DC converter is configured for an output voltage of 4.25V and provides up to 1.4A at the output. High efficiency up to 82.2% is achieved using a single transistor flyback DC-DC converter topology. The surface-mount transformer provides 1500V galvanic isolation for the output. UVLO, soft-start, and thermal shutdown provide a robust 6W isolated power supply. The EV kit can be reconfigured for interfacing to an external DC-DC converter for an additional 7W of output power.
*Future product--Contact factory for availability.
Warning: The MAX5940B EV kit operates with high voltages. Dangerous voltages are present on this EV kit and on equipment connected to it. Users who power up this EV kit or power the sources connected to it must be careful to follow safety procedures appropriate to working with high-voltage electrical equipment. Under severe fault or failure conditions, this EV kit may dissipate large amounts of power, which could result in the mechanical ejection of a component or of component debris at high velocity. Operate this EV kit with care to avoid possible personal injury.
Evaluates: MAX5940B/MAX5940D
Features
IEEE 802.3af-Compliant PD Interface Circuit PD Detection and Configurable Classification Signatures Programmable Inrush Current Limit Programmable UVLO Isolated 6W Flyback DC-DC Converter -36V to -60V Input Range Isolated 4.25V Output at 1.4A Evaluates Endspan and Midspan Ethernet Systems Interface to an External DC-DC Converter Local Power Inputs (Wall Cube) Also Evaluates MAX5940D (IC Replacement Required) Fully Assembled and Tested
Ordering Information
PART MAX5940BEVKIT TEMP RANGE 0C to +70C IC-PACKAGE 8 SO
________________________________________________________________ Maxim Integrated Products
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For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
MAX5940B Evaluation Kit Evaluates: MAX5940B/MAX5940D
Component List
DESIGNATION C1 QTY 1 DESCRIPTION 0.068F 10%, 100V X7R ceramic capacitor (1210) Murata GRM32NR72A683K 6800pF 10%, 100V X7R ceramic capacitor (0805) Murata GRM219R72A682K 47F 20%, 100V electrolytic capacitor (12.5mm x 13.5mm) Sanyo 100CV47FS 1000pF 10%, 250VAC X7R UL ceramic capacitor (2010) Murata GA352QR7GF102KW01L 330F 10%, 10V tantalum capacitors (X) Kemet T494X337K010AS 1.0F 10%, 50V X7R ceramic capacitors (1206) TDK C3216X7R1H105K 0.1F 10%, 16V X7R ceramic capacitors (0603) Murata GRM188R71C104K 1F 10%, 10V X5R ceramic capacitor (0603) Murata 188R61A105K 0.033F 10%, 50V X7R ceramic capacitor (0805) Murata GRM219R71H333K 4700pF 250VAC X7R ceramic capacitor (2220) Murata GA355DR7GC472KY02 22F 20%, 35V tantalum capacitor (D) Kemet T494D226M035AS D10 C13 1 0.1F 10%, 50V X7R ceramic capacitor (0805) Murata GRM21BR71H104K 0.22F 10%, 10V X7R ceramic capacitor (0603) Murata GRM188R71A224K D11 1 0 DESIGNATION C17 QTY 1 DESCRIPTION 10F 10%, 25V tantalum capacitor (C) Vishay 293D106X9025C2 1000pF 10%, 50V X7R ceramic capacitor (0603) Murata GRM188R71H102K 0.01F 10%, 100V X7R ceramic capacitors (0805) Murata GRM21BR72A103K 0.68F 20%, 100V X7R ceramic capacitor (1210) TDK C3225X7R2A684M 56.7V 600W zener overvoltage transient suppressor (SMB) Vishay SMBJ51A 3A 40V Schottky diode (SMC) Diodes Incorporated B340 1A 200V super-fast rectifiers (SMB) Diodes Incorporated MURS120 51V 5% 3W zener diode (SMB) Vishay BZG05C51 300mA 75V high-speed diode (SOD-123) Diodes Incorporated 1N4148W 1A 200V standard recovery power rectifiers (DFS case) Vishay DF02SA 1A 100V standard recovery power rectifier (SMA) Diodes Incorporated S1B Not installed, 1A 100V standard recovery power rectifier (SMA) Diodes Incorporated, S1B recommended 30V 500mW zener diode (SOD123) Diodes Incorporated BZT52C30
C2
1
C18
1
C3
1
C19, C20
2
C4
1
C21
1
C5, C6
2
D1
1
C7, C15
2
D2
1
D3, D4
2
C8, C16
2
D5 C9 1
1
D6
1
C10
1
D7, D8
2
C11
1
D9
1
C12
1
C14
1
2
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MAX5940B Evaluation Kit
Component List (continued)
DESIGNATION J1 JU1 JU2 N1 QTY 1 1 1 1 DESCRIPTION RJ-45 black through-hole connector, 8P-8C 3-pin header 5-pin header 150V, 4.3A n-channel MOSFET (D-PAK) Fairchild FQD5N15TM 60V, 200mA NPN transistors (SOT-23) Central Semiconductor CMPT3904 Not installed, resistor (1206) Not installed, resistor (0805) 25.5k 1% resistor (1206) 10k 1% 100ppm thick-film resistor (0805) Panasonic ERJ6ENF1002V 732 1% 100ppm thick-film resistor (1206) Panasonic ERJ8ENF7320V 392 1% 100ppm thick-film resistor (1206) Panasonic ERJ8ENF3920V 255 1% 100ppm thick-film resistor (1206) Panasonic ERJ8ENF2550V 178 1% 100ppm thick-film resistor (1812) Panasonic ERJ12NF1780U 470 5% resistor (0805) 10k 1% resistor (0805) 2.1k 1% resistor (0805) 221 1% resistor (0805) 100 5% resistor (0805) 0.68 1% resistor (1206) Panasonic ERJ8RQFR68V T2 TP1, TP2, TP3 TP0 U1 U2 1 3 1 1 1 DESIGNATION R15 R16 R17 R18, R19 R20 R21 R22 R23 R24 T1 QTY 1 1 1 2 1 1 1 1 1 1 DESCRIPTION 10 5% resistor (0805) 1M 5% resistor (0805) 24.3k 1% resistor (0805) 75 5% resistors (0805) Not installed, resistor (0805) 2k 1% resistor (0805) 100k 1% resistor (0805) 0 5% resistor (0805) 150 5% resistor (1210) 10/100BASE-TX voice-over-IP magnetic module Pulse Engineering H2005A 6W 200H transformer (12-pin Gull Wing) Cooper-Coiltronics CTX03-16649 PC test points, red PC test point, black MAX5940BESA (8-pin SO) Current-mode PWM controller (8-pin SO) Maxim MAX5014CSA High-isolation voltage photocoupler (SOP-4) CEL/NEC PS2703-1 1.24V precision shunt regulator (SOT-23-5L) Texas Instruments TLV431AIDBVR High-isolation voltage photocoupler (SOD-4) CEL/NEC PS2701A-1 Shunts (JU1, JU2) Rubber bumpers MAX5940B PC board
Evaluates: MAX5940B/MAX5940D
Q1, Q2 R1 R2 R3 R4
2 0 0 1 1
R5
1
R6
1
U3
1
R7
1
U4
1
R8 R9 R10 R11 R12 R13 R14
1 1 1 1 1 1 1
U5 None None None
1 2 4 1
Quick Start
The MAX5940B EV kit is fully assembled and tested. Follow these steps to verify board operation. Do not turn on the power supply until all connections are completed.
Required Equipment: An IEEE 802.3af-compliant PSE and a Category 5 or 5e Ethernet network cable or: * One 48V, 1A-capable DC power supply * MAX5940B EV kit * One voltmeter
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MAX5940B Evaluation Kit Evaluates: MAX5940B/MAX5940D
Component Suppliers
SUPPLIER CEL/NEC; California Eastern Laboratories Cooper-Coiltronics Diodes Incorporated Fairchild IRC Kemet Murata Panasonic Pulse Engineering Sanyo Electronic Device TDK Vishay PHONE 800-997-5227 561-752-5000 805-446-4800 888-522-5372 361-992-7900 864-963-6300 770-436-1300 714-373-7366 858-674-8100 619-661-6835 847-803-6100 -- FAX 408-588-2213 561-742-1178 805-446-4850 -- 361-992-3377 864-963-6322 770-436-3030 714-737-7323 858-674-8262 619-661-1055 847-390-4405 -- WEBSITE www.cel.com www.cooperet.com www.diodes.com www.fairchildsemi.com www.irctt.com www.kemet.com www.murata.com www.panasonic.com www.pulseeng.com www.sanyodevices.com www.component.tdk.com www.vishay.com
Note: Indicate that you are using the MAX5940B when contacting these component suppliers.
Hardware Connections
1) Verify that a shunt is installed on pins 1 and 2 of jumpers JU1 (Class 1-4) and JU2 (Class 1). 2) Use one of the following methods to power the MAX5940B EV kit: If network connectivity is required: connect a Category 5 Ethernet network cable from the MAX5940B EV kit input port RJ-45 (J1) connector to the corresponding PSE Ethernet LAN connection, which provides power to the EV kit. Test points TP4-TP9 provide the ethernet data signals. If network connectivity is not required: connect a 48V DC power supply to the GND and -48V pads on the MAX5940B EV kit. 3) Activate the PSE power supply or turn on the external DC power supply. 4) Using a voltmeter, verify that the EV kit provides +4.25V across the VOUT and PGND pads. PGND is galvanically isolated from the EV kit's input GND and output GND2 pads. 5) Observe desired signals with an oscilloscope or voltage meter on test point TP1 (U1 PGOOD pin), TP2 (U1 PGOOD), TP3 (U1 GATE), and TP0 (-48V) pads provided on the PC board.
Detailed Description of Hardware
The MAX5940B EV kit features an Ethernet-port network PD interface controller circuit for -48V supply rail systems. The MAX5940B IEEE 802.3af-compliant network PD interface controller in an 8-pin SO package. The MAX5940B has an internal isolation switch that also limits inrush current from the PSE. The MAX5940B is used in power-over-LAN applications for powering PDs from an unshielded twisted-pair (UTP) Ethernet Category 5 or 5e network cable and PSE port using endspan or midspan Ethernet systems. The MAX5940B EV kit receives power (12.95W, max) from an IEEE 802.3af-compliant PSE and a UTP cable connected to the EV kit's RJ-45 connector J1. It uses a 10/100BASE-TX VoIP magnetic module (T1) and two diode-bridge power rectifiers (D7, D8) to separate the -48V DC power sent by the PSE. The MAX5940B EV kit can accept power from an endspan or midspan PSE network configuration. Diode D8 provides the midspan power and diode D7 provides the endspan power. Test points TP4-TP9 pick off the Ethernet data signals from the IP magnetic module T1. Magnetic module T1 is a dual module; however, only a single module is required.
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MAX5940B Evaluation Kit
The EV kit demonstrates the full functionality of the MAX5940B such as PD detection signature, configurable PD classification signature, programmable inrush current, and programmable UVLO. Resistor R3 sets the PD detection signature. A smaller value resistor should be used to compensate for diode bridges with higher resistance. Resistors R4-R8 determine the PD classification signature and appropriately configured jumpers JU1 and JU2. A single resistor is required to determine the classification. Gate capacitor C2 sets the inrush current. To utilize the UVLO feature of the MAX5940B, PC board pads are provided to install resistors R1 and R2. Resistors R1 and R2 set the UVLO threshold voltage and also determine the PD detection signature. For reconfiguring the EV kit for UVLO operation, see the UVLO Configuration section. Also, for proper operation, set the UVLO voltage to a minimum of 12V. Test points TP0 (-48V), TP1 (PGOOD), TP2 (PGOOD), and TP3 (GATE) provide for voltage probing and/or interfacing with an external DC-DC converter. The MAX5940B EV kit's galvanically isolated, 6W flyback DC-DC converter uses a MAX5014 current-mode PWM controller. The MAX5940B's VOUT and GND2 pins (-32V to -60V DC) provide power for the DC-DC converter input circuit. The flyback DC-DC converter is configured for an output voltage of +4.25V and provides up to 1.4A at the output while achieving up to 82.2% efficiency. Minimal component count is obtained by using a singletransistor (N1) flyback DC-DC converter topology. The surface-mount transformer T2 provides 1500V galvanic isolation for the output. Current-sense resistor R14 limits the peak current through transistor N1 and primary of transformer T2 to 1.5A. Isolated feedback voltage is achieved by using optical coupler U3 and shunt regulator U4. Voltage feedback resistors R10 and R17 set the output voltage. Diodes D4 and D5 limit the voltage at the primary windings of T2 during switching. Resistor R15 and capacitor C18 form a snubber network that suppresses transient overvoltage ringing at diode D2 caused by transformer T2 leakage inductance and the junction capacitance of diode D2. Soft-start capacitor C14 enables the voltage at VOUT to ramp up in a controlled manner without any voltage overshoot. Internal UVLO and thermal shutdown within the MAX5014 provide for a robust 6W isolated powersupply design. The MAX5014 PWM controller operates at 275kHz and the duty cycle is limited to 85% maximum. Refer to the MAX5014 data sheet for more information on this controller. The EV kit can easily be reconfigured to interface with an external DC-DC converter for an additional 7W of output power using the provided -48VOUT and GND2 PC board pads and test points TP0, TP1, and TP2. Additionally, the EV kit can also be reconfigured for stand-alone operation with an external DC-DC converter rated for up to 12.95W. The MAX5940B EV kit also provides a circuit for powering the EV kit from a wall adapter or "local input" DC power source. Apply the local DC power source (36V to 44V) to the local input power (+) and local input power (-) PC board pads. Once the local input voltage is above 36V, optical coupler U4 turns off the MAX5940B internal MOSFET by pulling the GATE voltage low. Transistor Q1 turns off transistor Q3, which enables the DC-DC converter to run. Diode D3 prevents the PSE supply from back-driving the local power source. See the Local Input Power Source section for more information on using a wall adapter or "local input" DC power source. Caution: The -48VOUT is not isolated from the power coming from the RJ-45 jack J1.
Evaluates: MAX5940B/MAX5940D
Jumper Selection
The MAX5940B EV kit features several jumpers to reconfigure the EV kit's PD classification and external DC-DC converter operation. PD Classification Signature Selection The MAX5940B EV kit has two jumpers that set the desired PD classification signature to a PSE connected to the EV kit's input port J1 connector. The 3-pin jumper JU1 and 5-pin jumper JU2 configure the classification signature. Table 1 lists the jumper options.
Table 1. PD Classification Signature Selection
CLASS Class 0 Class 1 Class 2 Class 3 Class 4 JU1 SHUNT 2-3 1, 2 1, 2 1, 2 1, 2 JU2 SHUNT Don't care 1, 2 1, 3 1, 4 1, 5
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MAX5940B Evaluation Kit Evaluates: MAX5940B/MAX5940D
External DC-DC Converter or Stand-Alone Operation The MAX5940B EV kit features PC board pads and test points to interface directly with an external DC-DC converter. The GND2 and -48VOUT PC board pads provide power to the external -48V DC-DC converter. TP1 (PGOOD) and TP2 (PGOOD) provide interfacing with the external converter. TP0 is an additional -48V test point connection. Gate capacitor C2 must be replaced and depends on the total input capacitance of both DC-DC converters (EV kit and external). For stand-alone operation without the EV kit's 6W flyback DC-DC converter, remove several components. Short the PC board pads across capacitor C14 to disable the EV kit's on-board 6W flyback DC-DC converter. Also remove bulk capacitor C3. Additionally, replace gate capacitor C2, which depends upon the external DC-DC converter input capacitance. See the Gate Capacitor Selection section for selecting capacitor C2. The maximum power available at the GND2 and -48VOUT pads depends on the classification settings of jumpers JU1 and JU2. To reconfigure the MAX5940B EV kit for either method of operation, see Table 2. Local Input Power Source Opticoupler U5; transistors Q1 and Q2; and resistors R21, R22, and R23 along with diodes D9, D11, and the PC board pads for diode D10 enable the MAX5940B EV kit to be configured for various configurations using a local input power source with the PSE source. Use the Local Input Power (+) and Local Input Power (-) PC board pads to connect the local input power supply. The local input power-supply operating voltage range must be within 36V to 44V for the EV kit. This voltage range can be changed with proper selection of diode D11 and resistor R21. When the local input power source is above 36V, it will always take precedence over the PSE source. In this case, U5 turns off the MAX5940B internal MOSFET by pulling the GATE voltage low and the local power is supplied directly to the GND2 and -48VOUT pads. Once taking over, the local power source pollutes the discovery and classification signatures of the MAX5940B EV kit and prevents the PSE from powering up the EV kit until the local power has dropped to 0V. If the local input power source is below 32V and if the PSE power comes up first, the PSE will provide power through the MAX5940B IC VOUT pin. Diode D9 will prevent the PSE from back-driving the local input power source when it is below 32V. As an option when configuring the MAX5940B EV kit for a local input power source, cut open the PC board trace, shorting the diode D10 PC board pads, and install the recommended diode. D10 prevents the local input power source from polluting the discovery and classification signatures of the MAX5940B EV kit. In this configuration, the PSE power source can continuously detect the EV kit and provide power right away after the local power source voltage has dropped below 32V.
UVLO Configuration, Gate Capacitor Selection, and Ethernet Data-Signal Interfacing
Programmable UVLO Configuration The MAX5940B EV kit features a UVLO circuit that prevents operation below the programmed input-supply start voltage. Resistors R1 and R2 set the input voltage
Table 2. External Converter or Stand-Alone Operation
EV KIT OPERATION On-Board and External DC-DC Converters REMOVE EV KIT MODIFICATIONS * Calculate new C2 value, using C3 and external DC-DC converter total input capacitance. * Use TP0, TP1, TP2 to interface with an external DC-DC converter. * Use GND2 and -48VOUT pads to power an external converter.
None
Stand-Alone
* Calculate new C2 value, using an external DC-DC converter total input capacitance. Resistor R20 * Short capacitor C14 PC board pads. Capacitor C3 * Use TP0, TP1, TP2 to interface with an external DC-DC converter. * Use GND2 and -48VOUT pads to power an external converter.
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MAX5940B Evaluation Kit
turn-on and UVLO of the MAX5940B. To evaluate the programmable UVLO feature, remove resistor R3 and then install surface-mount resistors R1 (1206 case) and R2 (0805 case). Using the desired startup voltage, calculate resistors R1 and R2 using the following equations: VREF R2 = x 25.5k VINSTARTUP R1 = 25.5k - R2 where VIN STARTUP is the desired startup voltage (+12V) at which the EV kit starts and VREF is typically 2.47V. Additionally, the total series resistance of R1 and R2 must equate to 25.5k. Resistors R1 and R2 provide the PD detection signature's resistive component when using the UVLO feature. For proper operation, the R1/R2 divider voltage of the UVLO pin of the MAX5940B must not exceed 7.5V at the maximum input voltage. Gate Capacitor Selection The MAX5940B gate capacitor value depends upon the total capacitance connected to the MAX5940B IC -48VOUT and GND2 pins. Typically, this is the sum of any DC-DC converter input capacitance (including C3 and C21, if used) and any connected bulk capacitance. Gate capacitor C2 is a 0805 surface-mount PC board footprint and is chosen using the following equation: C x 10A C2 = IN IINRUSH Where I INRUSH is the desired inrush current (set to 100mA for this EV kit) and CIN is the total input capacitance connected to the MAX5940B -48VOUT and GND2 pins (only C3 as configured). When reconfiguring the EV kit for powering an external DC-DC converter, see the External DC-DC Converter or Stand-Alone Operation section for removing certain components. Ethernet Data Signal Interfacing The EV kit features several test points to interface with the Ethernet data signals. Test points TP4, TP5, and TP8 provide for interfacing with the Ethernet data receive signals. Test points TP6, TP7, and TP9 provide interfacing with the Ethernet data transmit signals. All trace lengths to/from module T1 have been matched to within 3mils in length. The data sheet for module T1, a 10/100BASE-TX VoIP magnetic module, should be consulted prior to interfacing with the EV kit's test point Ethernet data signals. The 10/100BASE-TX VoIP magnetic module (T1) can be replaced with a module rated for 1000BASE-TX for evaluation on Ethernet systems operating at 1000Mbps. The MAX5940B EV kit has not been verified under actual network operating conditions. A dual magnetic module is used for T1; however, only a single module is required.
Evaluates: MAX5940B/MAX5940D
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Evaluates: MAX5940B/MAX5940D
GND
MAX5940B Evaluation Kit
Figure 1. MAX5940B EV Kit Schematic (PD Main Circuit)
R1 OPEN GND 1 UVLO U1 TP1 7 PGOOD R20 OPEN TP2 4 VEE PGOOD -48VOUT C2 6800pF 100V -48VOUT 3 GATE OUT 5 PGOOD TP3 6 SS_SHDN SHORT (PC TRACE) GND 8 D10 GND2 GND2 C1 0.068F 100V R3* 25.5k 1% RCLASS 2 RCLASS PGOOD
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MAX5940B
R2 SHORT (PC TRACE) TP0 GATE GND2 GND2 PGOOD R23 0 R22 100k SS_SHDN 3 1 Q2 2 Q1 2 TP6 TD1+ TD1TP7 -48V 10 12 CLASS1 CLASS2 CLASS3 CLASS4 7 9 TP8 TP9 4 5 2 5 8 11 6 4 TP5 RD13 RX1TX1+ TP4 RD1+ 1 RX1+ 24 22 21 R21 2.0k 1% 3 1 1 2 D9 D11 U5 J1 RJ-45 8-PIN CONNECTOR J1-3 J1-6 J1-1 J1-2 J1-4 J1-5 J1-7 J1-8 D8 1 + 4 AC 3 AC -48V 2 D7 1 + 4 AC R19 75 3 AC -48V 2 R18 75 C19 0.01F C20 0.01F C4 1000pF 250VAC CHASSIS_GND R5 732 1% 3 R6 392 1% R7 255 1% R8 178 1% 3 2 JU1 1 JU2 2 1 19 T1 TX1H2005A 23 RXCT1 RD2+ 20 TXCT1 RD215 RX2+ TD2+ 13 RX2TD218 TX2+ RCT1 16 TX2TCT1 14 RXCT2 TCT2 17 TXCT2 RCT2
GND
D1
-48V
-48V
LOCAL INPUT POWER (+)
GATE
4
-48V
3
-48VOUT
LOCAL INPUT POWER (-)
CLASS0
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R4 10k 1%
RCLASS
NOTE: RESISTOR R4-R8 TCR IS 100ppm.
*A SMALLER VALUE RESISTOR SHOULD BE USED TO COMPENSATE FOR DIODE BRIDGES WITH HIGHER RESISTANCE.
-48VOUT -48VOUT C18 1000pF R15 10 VOUT D2 9 C7 1.0F C8 0.1F 1 8 -48VOUT 11 5 D3 6 -48VOUT 10 7 12 C5 330F 10V C6 330F 10V VOUT GND2 GND2 C21 0.68F 100V T2 3 C3 47F 100V
D5 D4 4 7 3 5 R13 100 VDD 2 C13 0.1F VOUT R9 470 C10 0.033F 2 3 U4 5 4 R10 10k 1% C9 1F R17 24.3k 1% R16 1M D6 C11 4700pF 250VAC R14 0.68 1% 1 N1
-48VOUT 6 GND U2 C14 0.22F
1 V+
R24 150 PGND
MAX5014 NDRV
4 SS_SHDN CS VCC 8
C17 -48VOUT 10F 25V
SS_SHDN
C16 0.1F R11 2.1k 1% 3 OPTO C12 22F 35V
Figure 2. MAX5940B EV Kit Schematic (6W 4.25V Isolated Power-Supply Circuit)
4 U3 1 3
Evaluates: MAX5940B/MAX5940D
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C15 1.0F
R12 221 1%
MAX5940B Evaluation Kit
9
MAX5940B Evaluation Kit Evaluates: MAX5940B/MAX5940D
Figure 3. MAX5940B EV Kit Component Placement Guide-- Component Side
Figure 4. MAX5940B EV Kit PC Board Layout--Component Side
Figure 5. MAX5940B EV Kit PC Board Layout--VCC Layer 2
Figure 6. MAX5940B EV Kit PC Board Layout--GND Layer 3
Figure 7. MAX5940B EV Kit PC Board Layout--Solder Side
Figure 8. MAX5940B EV Kit Component Placement Guide-- Solder Side
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
10 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2005 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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