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34063
Description
The MC34063A Series is a monolithic control circuit containing the primary functions required for DC-to-DC converters. These devices consist of an internal temperature compensated reference, comparator, controlled duty cycle oscillator with an active current limit circuit, driver and high current output switch. This series was specifically designed to be incorporated in Step-Down and Step-Up and Voltage-Inverting applications with a minimum number of external components.
Features
* * * * * * * Operation from 3.0 V to 40 V Input Low Standby Current Current Limiting Output Switch Current to 1.5 A Output Voltage Adjustable Frequency Operation to 100 kHz Precision 2% Reference
Plastic Package
Pin Connections
Internal Block Digram
Driver Collector 1 S R Ipk Sense Ipk Oscillator Comparator 1.25 V Reference 4 Gnd CT 7 100 2 3 VCC Comparator Inverting Input 6 Switch Emitter Timing Capacitor Q Q2 Q1
8
Switch Collector
5
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34063
Absolute Maximum Ratings
Symbol VCC VIR VC(switch) VE(switch) VCE(switch) VC(driver) IC(driver) ISW TJ TA Tstg Power Supply Voltage Comparator Input Voltage Range Switch Collector Voltage Switch Emitter Voltage (V PIN1 = 40 V) Switch Collector to Emitter Voltage Driver Collector Voltage Driver Collector Current (Note 1) Switch Current Operating Junction Temperature Operating Ambient Temperature Range Storage Temperature Range Parameter Maximum 40 -0.3 to +40 40 40 40 40 100 1.5 +150 0 to +70 -65 to +150 Units Vdc Vdc Vdc Vdc Vdc Vdc mA A C C C
Electrical Characteristics
(Vcc=5.0V, Ta=Tlow specified) to Thigh , unless otherwise
Symbol fOSC Ichg Idischg Idischg / Ichg Vipk(sence) VCE(sat) VCE(sat) hFE IC(off) Vth 1.225 1.25 1.21 - - 1.4 - -20 1.275 1.29 5.0 -400 Min 24 24 140 5.2 250 - - 50 - Typ 33 35 220 6.5 300 1.0 0.45 75 40 Max 42 42 260 7.5 350 1.3 0.7 - 100 Units kHz A A - mV V V - A V
Characteristics OSCILLATOR Frequency (Vpin5 = 0V, CT = 1.0 nF, TA = 25 C) Charge Current(VCC = 5.0V to 40V, TA = 25 C) Discharge Current (V CC = 5.0V to 40V, TA = 25 C) Discharge to Charge Current Ratio (Pin 7 to V CC, TA = 25 C) Current Limit Sense Voltage (I chg = Idischg, TA = 25 C) OUTPUT SWITCH (NOTE 2) Saturation Voltage, Darlington Connection (I SW = 1.0 A, Pins 1, 8 connected) Saturation Voltage, Darlington Connection (I SW = 1.0 A, Rpin 8 = 82 to VCC , Forced 20) DC Current Gain (ISW = 1.0 A, VCE = 5.0 V, TA = 25 C) Collector Off-State Current (V CE = 40 V) COMPARATOR Threshold Voltage (TA=25 C) (TA =Tlow to Thigh) Threshold Voltage Line Regulation (Vcc=3.0 V to 40 V) Input Bias Current (Vin=0 V) TOTAL DEVICE Supply Current (Vcc = 5.0 V to 40 V, CT = 1.0 nF, Pin 7 = V CC, Vpin 5 > Vth, Pin 2 = Gnd, remaining pins open)
Regline IIB
mV nA
ICC
-
-
4.0
mA
NOTES : 1.Maximum package power dissipation limits must be observed.
2.Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient temperature as possible
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34063
Typical Performance Characteristics
Figure 1. Output Switch On-Off Time versus Oscillator Timing Capacitor Figure 2. Timing Capacitor Waveform
A
Figure 3. Emitter Follower Configuration Output Saturation Voltage versus Emitter Current versus
Figure 4. Common Emitter Configuration Output Switch Saturation Voltage Collector Current
Figure 5. Current Limit Sense Voltage versus Temperature
Figure 6. Standby Supply Current versus Supply Voltage
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34063
Typical Applications Circuit
Figure 1. Step-Up Converte . r
Note: R to 0 for constant Vin
Figure 2a. External NPN Switch. Figure 2. External Current Boost Connections for I P
Figure 2b. External NPN Saturated Switch. eak Greater than 1.5 A .
BEIJING ESTEK ELECTRONICS CO.,LTD
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34063
Figure 3. Step-Down Converte . r
Figure 4a. External NPN Switch. Figure 4. External Current Boost Connections for I P
Figure 4b. External PNP Suturated Switch. eak Greater than 1.5 A .
BEIJING ESTEK ELECTRONICS CO.,LTD
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34063
Figure 5. Voltage Inverting Converte . r
Figure 6a. External NPN Switch. Figure 6. External Current Boost Connections for I P
Figure 6b. External PNP Saturated Switch. eak Greater than 1.5 A .
BEIJING ESTEK ELECTRONICS CO.,LTD
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34063
Design Formula Table
Calculation Step-Up Step-Down
in
Voltage-Inverting
ton/toff
+ VV in -
out
-
(min) sat
V
in (min) out
+ VF -Vsat -
1
V
1
V
V
+VF V +V in sat V 1
out
min
(ton+toff)max CT lpk(switch) RSC L(min)

f
+ 1
- t on(max)
f 4.0 x 10-5
t 2 I
(max)
ton
f 4.0x10-5
2I out(max)
ton
4.0 x 10-5
2I on t
0.3/lpk(switch)
V -sat xt on (max) V I pk ( switch )
in
on
+ 1
0.3/lpk(switch)
Vin (min) V sat V - out xon(max) I pk ( switch )
0.3/lpk(switch)
Vin(min) V sat I pk ( switch)
CO
9
I out ton Vripple ( pp )
I pk ( switch ) ( t 8V
ripple ( pp )
+ t
)
9
tI Vripple ( pp )
TERMS AND DEFINITIONS Vsat Saturation voltage of the output switch. VF Forward voltage drop of the output rectifier. The following power supply characteristics must be chosen: R Vout = . 5 1+ 12 R 1 Vin Nominal input voltage. Vout Desired output voltage, Iout Desired output current. fmin Minimum desired output switching frequency at the selected values of V in and IO. Vripple(p-p) -Desired peack-to-peack output ripple voltage. In practice, the calculated capacitor value will need to be increased due to its equivalent series resistance and board layout. The ripple voltage should be kept to a low value since it will directly affect the line and load regulation.
Ordering Information
O RDERING NUM BER 34063A P ACK AGE SOP-8 /DIP-8 6A06--6A07 Rm 6A07,Changyin Office Building ,No.88,Yong Ding Road,Hai Dian District ,Beijing Postalcode:100039 Tel: 86-010-58895780 / 81 / 82 / 83 / 84 Http://www.estek.com.cn Email:sales@estek.com.cn REV No:01-060810
BEIJING ESTEK ELECTRONICS CO.,LTD
M ARKING MC34063A
Address :
Fax : 010-58895793
7

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