PJ432/PJ432A/PJ432B
Adjustable Precision Shunt
1-8
2003/01.ver.A
he PJ432 is a three-terminal adjustable shunt regulator
with specified thermal stability. The output voltage may
be set to any value between Vref (approximately 1.24V) and
18V with two external resistors. The PJ432 has a typical
output impedance
o
f 0.15 . Active output circuitry
provides a very sharp turn-on characteristic, making the
PJ432 excellent replacement for zener diode in many
applications.
Equivalent Full-Range Temperature Coefficient 50 ppm/
Temperature Compensated for Operation over Full Rated
Operating Temperature Range
Adjustable Output Voltage
Fast Turn-On Response
Sink Current Capability of 1.0 to 100 mA
Low(0.15
Type) Dynamic Output Impedance
Low Output Noise
(unless otherwise noted)
T
FEATURES
SYMBOL
ORDERING INFORMATION
REFERENCE (R)
ANODE CATHODE
(A) (K)
ABSOLUTE MAXIMUM RATINGS OVER OPERATING FREE-AIR TEMPERATURE RANGE
Parameter Value
Units
Cathode voltage(see Note 1)
20
V
Continuous cathode current range
-10 to 250
mA
Reference input current range
10mA
mA
Operating free-air Temperature range
-20 to +85
Storage Temperature
-60 to +150
Lead temperature 1.6mm from case for 10 seconds
260
Power Dissipation (see Note 2,3)
TO-92
SOT-89
SOT-23
0.625
0.80
0.30
W
Note 1:Voltage values are with respect to the anode terminal unless otherwise noted.
Note 2: T
J
Max = 150
Note 3: Rating apply to ambient temperature at 25
SOT-23
Pin: 1. Reference
2. Anode
3. Cathode
Pin: 1. Reference
2. Cathode
3. Anode
SOT-89
TO-92
Pin: 1. Reference
2. Cathode
3. Anode
Device
Operating Temperature
(Ambient)
Package
PJ432/A/B CT
TO-92
PJ432/A/B CX
SOT-23
PJ432/A/B CY
-20 to +85
SOT-89
PJ432/PJ432A/PJ432B
Adjustable Precision Shunt
2-8
2003/01.ver.A
Note 4. Deviation of reference input voltage, V
DEV ,
is defined as the maximum vatiation of the reference over the full temperature
range.
The average temperature coefficient of the reference input voltageVref is defined as:
.......................... (PPM/)
Where :
T2-T1=full temperature change.
Vref can be positive or negativedepending on whether the slope is positive or negative.
Note 4. The dynamic output impedance, Rz, is defined as :
When the device is programmed with two external resistors R1and R2(see Figure 2). The dynamic output impedance of the
overall circuit, is defined as :
Parameter Symbol Test
Conditions
MIN Typ
MAX
UNIT
Reference Voltage
PJ432A
PJ432
PJ432B
Vref
V
KA
=Vref,I
K
=10mA
T
A
= +25
1.233
1.227
1.215
1.240
1.240
1.240
1.246
1.252
1.264
V
Vref Temp. Deviation
V
DEV
T
A
=-40to+85
V
KA
= Vref, I
K
=10mA
-- 10 25 mV
Reference Input Current
Iref
R1=10K,R2=
, I
K
=10mA
-- 0.15 4.0 A
Radio of change in Vref to
Change in Cathode Voltage
Vref
V
KA
I
K
=10mA, V
KA
=16V to Vref
-- -1.0 -2.7
mV/V
Iref Temp. Deviation
Iref
(DEV)
T
A
=-40 to+85
R1=10K,R2=
, I
K
=10mA
-- 0.1 4.0 A
Minimum Operating Current
Imin
V
KA
=Vref --
60
200
A
V
KA
=6V --
0.5
2.0
Off-state Cathode Current
Ioff
Vref=0V
V
KA
=16V --
0.5
2.0
A
Dynamic Output Impedance
|
Z
KA
|
f<1KHz, V
KA
=Vref
I
K
=100A to 100mA
-- 0.25 0.4
Parameter MIN
MAX
TYP
Cathode voltage, V
KA
Vref
18
V
Cathode current, I
K
(for regulation)
1
100
mA
ELECTRICAL CHARACTERISTICS AT
25
FREE-AIR TEMPERATURE
Unless Otherwise Noted
RECOMMENDED OPERATING CONDITIONS
PJ432/PJ432A/PJ432B
Adjustable Precision Shunt
3-8
2003/01.ver.A
FIGURE 1. TEST CIRCUIT FOR V
KA
= V
REF
FIGURE 2. TEST CIRCUIT FOR V
KA
> V
REF
FIGURE 3. TEST CIRCUIT FOR off-state CURRENT
FIGURE 4.CATHODE CURRENT versus CATHODE
VOLTAGE
FIGURE 5.CATHODE CURRENT versus CATHODE FIGURE 6.SHUNT REGULATOR
VOLTAGE
PJ432/PJ432A/PJ432B
Adjustable Precision Shunt
4-8
2003/01.ver.A
FIGURE 7. SINGLE-SUPPLY COMPARATOR WITH
TEMPERATURE COMPENEATED THREEHOLD
FIGURE 8. VOLTAGE MONITOR FIGURE 9. DELAY TIMER
FIGURE 10. CURRENT LIMITER OR CURRENT SOURCE FIGURE 11. CONTACNT-CURRENT SINK
APPLICATION EXAMPLE
PJ432/PJ432A/PJ432B
Adjustable Precision Shunt
5-8
2003/01.ver.A
FIGURE 12. HIGHER-CURRENT SHOUNT REGULATOR FIGURE 13. CROW BAR
FIGURE 14. OVER-VOLTAGE/UNDER-VOLTAGE PROTECTION
TYPICAL PERFORMANCE CHARACTERISTICS
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