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IP431A Series
TOP VIEW
CATHODE NC NC NC
1 2 3 4 8 7 6 5
REF NC ANODE NC
PROGRAMMABLE PRECISION REFERENCE
FEATURES
* VOLTAGE REFERENCE TOLERANCE 1% * PROGRAMMABLE OUTPUT VOLTAGE TO 36V * EQUIVALENT FULL RANGE TEMPERATURE COEFFICIENT OF 30ppm/C TYPICAL
J Package - 8 Pin Ceramic DIP N Package - 8 Pin Plastic DIP TOP VIEW
CATHODE
1 2 8 7
REF
* TEMPERATURE COMPENSATED FOR OPERATION OVER FULL RATED OPERATING TEMPERATURE RANGE * SINK CURRENT CAPABILITY 1 TO 100 mA * FAST TURN-ON RESPONSE * LOW DYNAMIC OUTPUT IMPEDANCE (0.2 typical) * LOW OUTPUT NOISE VOLTAGE * ALSO AVAILABLE IN TO-92 PACKAGE
ANODE
3 6 5
ANODE
NC
4
NC
D Package - 8 Pin Plastic (150) SOIC
* Note that the SOIC package used for the IP431A has a modified lead frame to increase power dissipation capability when appropriately mounted on a PCB.
Part Number IP431AM IP431AI IP431AC
J-Pack 8 Pin
N-Pack 8 Pin
D-Pack 8 Pin
Amb. Temp. Note: Range -55 to +125C To order, add the package identifier to the part number. IP431AMJ -40 to +85C eg. IP431ACD 0 to +70C
ABSOLUTE MAXIMUM RATINGS (Tcase = 25C unless otherwise stated)
VKA IK IREF PD Cathode To Anode Voltage Cathode Current Range Reference Input Current Range Power Dissipation @ TA = 25C D Package N Package J Package D Package N Package J Package 37V -100 to +150mA -0.05 to +10mA 0.70W 1.10W 1.25W 6mW/C 1.5W 3W 3.3W 150C See Table Above -65 to 150C
Prelim. 2/95
Derate Above 25C PD Power Dissipation @ TC = 25C
TJ TA TSTG
Maximum Operating Junction Temperature Operating Ambient Temperature Range Storage Temperature Range
Telephone (01455) 556565. Telex: 341927. Fax (01455) 552612.
Semelab plc.
IP431A Series
DESCRIPTION
The IP431A circuit is a monolithic three terminal programmable shunt regulator diode. The voltage reference operates as a low temperature coefficient zener which is programmable between VREF (2.5V) and 36 volts using two external resistors. The device has a wide operating current range of 1 mA to 100mA and a typical dynamic impedance of 0.2. Active output circuitry provides a very sharp turn-on characteristic making these devices excellent replacements for zener diodes in many applications. Being a shunt regulator it can be used as either a positive or negative voltage reference.
BLOCK DIAGRAM
CATHODE REF
2.5 V REF
ANODE
RECOMMENDED OPERATING CONDITIONS
VKA IK Cathode To Anode Voltage Cathode Current Range VREF to 36V 1.0 to 100mA
ELECTRICAL CHARACTERISTICS (TA = 25 C unless otherwise stated)
Parameter
VREF VREF VREF VKA IREF IREF IMIN IOFF |Zka| Reference Input Voltage Reference Input Voltage Over Temperature Range
1
Test Conditions
(Figure 1) VKA = VREF IK = 10mA VKA = VREF (Figure 1) IK = 10mA IK = 10mA R1 = 10k IK = 10mA R1 = 10k TA = -55 to +125C * VKA = 10V to VREF VKA = 36V to 10V R2 = TA = -55 to +125C * R2 = TA = -55 to +125C * TA = -55 to +125C *
Min.
2.47 2.426
IP431AM Typ.
2.495
Max.
2.52 2.564
Units
V
15 -1.5 -0.7 1
44 -2.7
mV
Ratio of Reference Voltage Change to Change in Cathode to Anode Voltage (Figure 2) Reference Input Current (Figure 2)
mV/V -2 4 7 1 3 A A
Reference Input Current Deviation Over Temperature Range Minimum Cathode Current For Regulation Off-State Cathode Current Dynamic Impedance 2 (Figure 1)
(Figure 2) IK = 10mA VKA = VREF
0.5 VREF = 0 f 1kHz 3 0.2
1 1000 0.5
mA nA
(Figure 3) VKA = 36V (Figure 1) VKA = VREF
IK = 1mA to 100mA
* This test is not applicable to surface mount (D Package) devices.
Semelab plc.
Telephone (01455) 556565. Telex: 341927. Fax (01455) 552612.
Prelim. 2/95
IP431A Series
ELECTRICAL CHARACTERISTICS (TA = 25 C unless otherwise stated)
Parameter
VREF VREF VREF VKA IREF IREF IMIN IOFF |Zka| Reference Input Voltage Reference Input Voltage Over Temperature Range 1 (Figure 1)
Test Conditions
VKA = VREF IK = 10mA VKA = VREF (Figure 1) IK = 10mA IK = 10mA R1 = 10k IK = 10mA R1 = 10k TA = -40 to +85C * VKA = 10V to VREF VKA = 36V to 10V R2 = TA = -40 to +85C * R2 = TA = -40 to +85C * TA = -40 to +85C *
Min.
2.47 2.44
IP431AI Typ.
2.495
Max.
2.52 2.55
Units
V
7 -1.5 -0.7 1
30 -2.7
mV
Ratio of Reference Voltage Change to Change in Cathode to Anode Voltage (Figure 2) Reference Input Current (Figure 2)
mV/V -2 4 6.5 0.8 2.5 A A
Reference Input Current Deviation Over Temperature Range Minimum Cathode Current For Regulation Off-State Cathode Current Dynamic Impedance 2 (Figure 1)
(Figure 2) IK = 10mA VKA = VREF
0.5 VREF = 0 f 1kHz 3 0.2
1 1000 0.5
mA nA
(Figure 3) VKA = 36V (Figure 1) VKA = VREF
IK = 1mA to 100mA
Parameter
VREF VREF VREF VKA IREF IREF IMIN IOFF |Zka| Reference Input Voltage Reference Input Voltage Over Temperature Range
1
Test Conditions
(Figure 1) VKA = VREF IK = 10mA VKA = VREF (Figure 1) IK = 10mA IK = 10mA R1 = 10k IK = 10mA R1 = 10k TA = 0 to +70C * VKA = 10V to VREF VKA = 36V to 10V R2 = TA = 0 to +70C * R2 = TA = 0 to +70C * TA = 0 to +70C *
Min.
2.47 2.453
IP431AC Typ.
2.495
Max.
2.52 2.537
Units
V
3 -1.5 -0.7 1
17 -2.7
mV
Ratio of Reference Voltage Change to Change in Cathode to Anode Voltage (Figure 2) Reference Input Current (Figure 2)
mV/V -2 4 5.2 0.4 1.2 A A
Reference Input Current Deviation Over Temperature Range Minimum Cathode Current For Regulation Off-State Cathode Current Dynamic Impedance 2 (Figure 1)
(Figure 2) IK = 10mA VKA = VREF
0.5 VREF = 0 f 1kHz 3 0.2
1 1000 0.5
mA nA
(Figure 3) VKA = 36V (Figure 1) VKA = VREF
IK = 1mA to 100mA
* This test is not applicable to surface mount (D Package) devices.
Semelab plc.
Telephone (01455) 556565. Telex: 341927. Fax (01455) 552612.
Prelim. 2/95
IP431A Series
FIGURE 1 TEST CIRCUIT FOR VKA = VREF
Input IK V KA
NOTE 1
The deviation parameter VREF is defined as the differences between the maximum and minimum values obtained over the full operating ambient temperature range that applies.
V REF
V REF Max
VREF = VREF Max VREF Min
V REF Min
TA = T2 - T1
T1 T2 AMBIENT TEMPERATURE
FIGURE 2 TEST CIRCUIT FOR VKA > VREF
Input IK I REF V REF V KA
The average temperature coefficient of the reference input voltage, VREF is defined as: VREF 6 ppm VREF @ 25C x 10 VREF x 106 VREF = = = C TA TA (VREF @ 25C)
(
)
VREF can be positive or negative depending on whether VREF Min or VREF Max occurs at the lower ambient temperature. VKA = VREF 1+ R1 R2
(
)+I
REF
x R1
Example:
VREF = 8.0 mV and slope is positive, VREF @ 25C = 2.495V, TA = 70C VREF = 0.008 x 106 = 45.8 ppm/C = 45.8 ppm/C 70 (2.495)
FIGURE 3 TEST CIRCUIT FOR Ioff
NOTE 2
Input I off V KA
The dynamic impedance Zka is defined as: VKA |Zka| = IK When the device is programmed with two external resistors, R1 and R2, (refer to Figure 2) the total dynamic impedance of the circuit is defined as: |Zka| |Zka| 1+ R1 R2
(
)
Semelab plc.
Telephone (01455) 556565. Telex: 341927. Fax (01455) 552612.
Prelim. 2/95
IP431A Series
TYPICAL APPLICATIONS
CONSTANT CURRENT SOURCE CONSTANT CURRENT SINK
V+ V+ RCL I OUT I SINK = VREF RCL VREF RS I SINK
I OUT =
RS
SHUNT REGULATOR
V+ R1 VOUT
HIGH CURRENT SHUNT REGULATOR
V+ VOUT
R1 R2 R2 R1 R2 R1 R2
VOUT = 1+
VREF
VOUT = 1+
VREF
OUTPUT CONTROL OF A THREE-TERMINAL FIXED REGULATOR
IP7805
SERIES PASS REGULATOR
V+
IN COMMON
OUT
VOUT
V+
VOUT
R1
R1
R2
R2
VOUT = 1+
R1 R2
VREF
VOUT = 1+
R1 R2
VREF
VOUT(min) = VREF + 5V
VOUT(min) = VREF + VBE
Semelab plc.
Telephone (01455) 556565. Telex: 341927. Fax (01455) 552612.
Prelim. 2/95
IP431A Series
TYPICAL APPLICATIONS
TRIAC CROWBAR
V+ R1 VOUT V+ R1
THYRISTOR CROWBAR
VOUT
R2 R1 R2 R1 R2
R2
VOUT(trip) = 1+
VREF
VOUT(trip) = 1+
VREF
VOLTAGE MONITOR
V+ R1 R3 VOUT
SINGLE SUPPLY COMPARATOR WITH TEMPERATURE COMPENSATED THRESHOLD
V+
VOUT VIN R2 R4
LED is `on' when V+ is between the upper and lower limits. Lower Limit = Upper Limit = 1+ R1 VREF R2
VTH = V REF
VIN < V REF
VOUT V+
> V REF = 2.0 V
R3 VREF 1+ R4
THERMAL CHARACTERISTICS
RJA Thermal Resistance, Junction - Ambient D Package N Package J Package D Package N Package J Package 178C/W 114C/W 100C/W 83C/W 41C/W 38C/W
RJC
Thermal Resistance, Junction - Case
Semelab plc.
Telephone (01455) 556565. Telex: 341927. Fax (01455) 552612.
Prelim. 2/95
IP431A Series
TYPICAL PERFORMANCE CHARACTERISTICS
CATHODE CURRENT vs CATHODE VOLTAGE
150
VK A = VR E F TA = 25 C
CATHODE CURRENT vs CATHODE VOLTAGE
800
VK A = VR E F TA = 25 C
I K CATHODE CURRENT (m A)
100
INPUT
IK
VK A
I K CA THODE CURRENT (A)
600
INPUT
IK
VK A
50
400
0
200
-50
0
-100 -2 -1 0 1 2 3
VKA CATHODE VOLTAGE (V)
-200 -1 0 1 2 3
VKA CATHODE VOLTAGE (V)
REFERENCE INPUT VOLTAGE vs AMBIENT TEMPERATURE
2600 2580 2560
V REF REFERE NCE INP UT VO LTAGE (m V)
VK A = VR EF IK = 10mA INPUT IK VK A
REFERENCE INPUT CURRENT vs AMBIENT TEMPERATURE
1.50 1.25
V REF REFERE NCE INP UT VO LTAGE (m V)
2540 2520 2500 2480 2460 2440 2420 2400 -55 -25
TA
VR E F
1.00 0.75
IKK= 10mA I = 10mA
0.50 0.25 0.00 -55
INPUT
10 k
VK A IK IR E F
0
25
50
75
100
125
-25
TA
0
25
50
75
100
125
AMBIENT TEMPERATURE (C)
AMBIENT TEMPERATURE (C)
CHANGE IN REFERENCE INPUT VOLTAGE vs AMBIENT TEMPERATURE
0 -4
V REF R EFERENCE INPUT VO LTAGE (m V)
I K = 10mA TA = 25 C
OFF -STATE CATHODE CURRENT vs AMBIENT TEMPERATURE
1000
VK A = 36V VR E F = 0
I OFF OFF-STA TE CATHODE CURRE NT (nA)
INPUT
VK A IK
100
INPUT
-8
R1
IO F F
VK A
IR E F
VR E F
-12 -16 -20 -24 -28 -32
R2
10
1
0.1
0
10
20
30
40
0.01 -55
-25
TA
0
25
50
75
100
125
VKA CATHODE VOLTAGE (V)
AMBIENT TEMPERATURE (C)
Semelab plc.
Telephone (01455) 556565. Telex: 341927. Fax (01455) 552612.
Prelim. 2/95

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