cys
tek
Description
CYStech Electronics Corp.
Spec. No. : C504A3
Issued Date : 2003.03.21
Revised Date :
Page No. : 1/9
Adjustable shunt regulator
PL432XA3/N3
Features
◆Low
voltage operation(down to 1.24V)
◆Wide
operating current range 80μA to 100mA
◆Low
dynamic output impedance 0.05Ω typ.
◆Trimmed
bandgap design
±0.25%
◆Upgrade
for PL431
◆Available
in TO-92 and SOT-23 packages
The PL432 is a three terminal adjustable shunt
regulator with thermal stability guaranteed over
temperature. The output voltage can be adjusted
to any value from 1.24V(V
REF
) to 20V with two
external resistors. The PL432 has a typical dynamic
output impedance of 0.05Ω. Active output circuitry
provides a very sharp turn on characteristic, making
the PL432 an excellent replacement for zener diodes.
The PL432 shunt regulator is available with four
Voltage tolerances(0.25%,0.5%,1% and 2%), and two
package options(TO-92 and SOT-23). This allows the
designer the opportunity to select the optimum combi-
nation of cost and performance for their application.
Applications
◆Linear
Regulators
◆Adjustable
Supplies
◆Switching
Power Supplies
◆Battery
Operated Computers
◆Instrumentation
◆
Computer Disk Drives
Typical Application Circuit
(Note 1,2)
Notes:
VIN
R
VOUT
R1
VREF
PL432
R2
GND
1) Set V
OUT
according to the following equation:
V
OUT
=V
REF
(1+R1/R2)+I
REF
R1
2) Choose the value for R as follows:
˙The maximum limit for R should be such that the
cathode current, Iz, is greater than the minimum
operating current(80μA) at VI
N(MIN)
.
˙The minimum limit for R should be as such that Iz
does not exceed 100mA under all load conditions,
and the instantaneous turn-on value for Iz does not
exceed 150mA. Both of the following conditions
must be met:
Rmin≥V
IN(max)
/150mA(to limit instantaneous
turn-on Iz)
Rmin≥
V
IN(max)
-V
OUT
(to limit Iz under
I
OUT(min)
+100mA normal operating
conditions)
PL432XA3/N3
CYStek Product Specification
cys
tek
CYStech Electronics Corp.
Spec. No. : C504A3
Issued Date : 2003.03.21
Revised Date :
Page No. : 2/9
Absolute Maximum Ratings
Parameter
Cathode Voltage
Continuous Cathode Current
Reference Input Current
Power Dissipation at T
A
=25℃
SOT-23
TO-92
Thermal Resistance
SOT-23
TO-92
Operating Ambient Temperature Range
Operating Junction Temperature Range
Storage Temperature Range
Lead Temperature(Soldering) 10 seconds
ESD Rating(Human Body Model)
Symbol
Vz
I
Z
I
REF
P
D
Maximum
20
100
3
0. 37
0.95
336
132
0 to +70
0 to +150
-65 to +150
300
2
Units
V
mA
mA
W
Θ
JA
T
A
T
J
Tstg
T
LEAD
V
ESD
℃/W
℃
℃
℃
℃
kV
Electrical Characteristics
Unless otherwise specified, TA=25℃. Values in bold apply over full operating ambient temperature range.
PL432D
Parameter
Reference Voltage
V
REF
Temperature
Deviation
Ratio of Change in
V
REF
to change in V
Z
Reference Input
Current
I
REF
Temperature
Deviation
Off-state Cathode
Current
Dynamic Output
Impedance
Minimum Operating
Current
Symbol
Condition
V
REF
V
Z
=V
REF
,I
Z
=10mA(Note 1)
V
DEV
V
Z
=V
REF
,I
Z
=10mA(Note 1)
ΔV
REF
I
Z
=10mA,
ΔV
Z
=16V to V
REF
ΔV
Z
I
REF
R1=10kΩ,R2=∞,
I
Z
=10mA(Note2)
I
REF(DEV)
R1=10kΩ,R2=∞,
I
Z
=10mA(Note 2)
I
Z(OFF)
V
REF
=0V,V
Z
=6V(Note 3)
V
REF
=0V,V
Z
=16V(Note 3)
f <1kHz,V
Z
=V
REF
r
z
I
Z
=100μA to 100mA(Note 1)
I
Z(MIN)
V
Z
=V
REF
(Note 1)
Min
1.237
1.224
-
-
-
-
-
-
-
-
Typ
1.240
10
-1.0
0.15
0.1
0.125
0.135
0.05
20
Max
1.243
1.256
25
-2.7
0.5
0.4
0.150
0.150
0.15
80
Min
1.234
1.222
-
-
-
-
-
-
-
-
PL432C
Typ
Max
1.240 1.246
1.258
10
25
-1.0
0.15
0.1
0.125
0.135
0.05
20
-2.7
0.5
0.4
0.150
0.150
0.15
80
Unit
V
mV
mV/V
μA
μA
μA
Ω
μA
PL432XA3/N3
CYStek Product Specification
cys
tek
Parameter
Reference Voltage
V
REF
Temperature
V
DEV
Deviation
Ratio of Change in
ΔV
REF
V
REF
to change in V
Z
ΔV
Z
Reference Input
I
REF
Current
I
REF
Temperature
I
REF(DEV)
Deviation
Off-state Cathode
I
Z(OFF)
Current
Dynamic Output
r
z
Impedance
Minimum Operating
I
Z(MIN)
Current
Notes:
(1) See Test Circuit 1.
(2) See Test Circuit 2.
(3) See Test Circuit 3.
CYStech Electronics Corp.
Spec. No. : C504A3
Issued Date : 2003.03.21
Revised Date :
Page No. : 3/9
Electrical Characteristics(Cont.)
Unless otherwise specified, TA=25℃. Values in bold apply over full operating ambient temperature range.
PL432B
Symbol
Condition
V
REF
V
Z
=V
REF
,I
Z
=10mA(Note 1)
V
Z
=V
REF
,I
Z
=10mA(Note 1)
I
Z
=10mA,
ΔV
Z
=16V to V
REF
R1=10kΩ,R2=∞,
I
Z
=10mA(Note2)
R1=10kΩ,R2=∞,
I
Z
=10mA(Note 2)
V
REF
=0V,V
Z
=6V(Note 3)
V
REF
=0V,V
Z
=16V(Note 3)
f<1kHz,V
Z
=V
REF
I
Z
=100μA to 100mA(Note 1)
V
Z
=V
REF
(Note 1)
Min
1.228
1.215
-
-
-
-
-
-
-
-
Typ
1.240
10
-1.0
0.15
0.1
0.125
0.135
0.05
20
Max
1.252
1.265
25
-2.7
0.5
0.4
0.150
0.150
0.15
80
Min
1.215
1.200
-
-
-
-
-
-
-
-
PL432A
Typ
Max
1.240 1.265
1.280
10
35
-1.0
0.15
0.1
0.125
0.135
0.05
20
-2.7
0.5
0.4
0.150
0.150
0.15
80
Unit
V
mV
mV/V
μA
μA
μA
Ω
μA
Recommended Operating Conditions
Symbol
Cathode Voltage
Cathode Current
V
Z
I
Z
Min
V
REF
0.08
Max
16
100
Unit
V
mA
Test Circuits
VIN
VZ
VIN
VZ
VIN
VZ
IREF
IZ
R1
IREF
VREF
IZ
IZ(off)
R2
Test Circuit 1
VZ=VREF
Test Circuit 2
VZ>VREF
Test Circuit 3
Off-State
PL432XA3/N3
CYStek Product Specification
cys
tek
300
CYStech Electronics Corp.
Spec. No. : C504A3
Issued Date : 2003.03.21
Revised Date :
Page No. : 5/9
Characteristic Curves
Cathode Current vs Cathode Voltage
150
Vz=V
REF
TA=25℃
100
50
0
-50
-100
-150
-1.5
-1
-0.5
0
0.5
1
1.5
Vz=VREF
TA=25℃
Cathode Current vs Cathode Voltage
Cathode Current---IZ(μA)
100
0
-100
-200
-300
Cathode Current---Iz(mA)
200
-1
-0.5
0
0.5
1
1.5
Cathode Voltage---Vz(V)
Cathode Voltage---Vz(V)
Reference Voltage vs Junction Temperature
1.248
Reference Voltage---VREF(V)
1.246
1.244
1.242
1.24
1.238
1.236
1.234
-50
0
50
100
150
Junction Temperature---TJ(℃)
IZ=60μA
Iz=10mA
Reference Input Current---IREF(nA)
150
Reference Input Current vs Junction Temperature
125
Iz=10mA
R1=10kΩ
R2=∞
100
75
50
-50
-25
0
25
50
75
100
125
150
Junction Temperature---TJ(℃)
Ratio of Delta Reference Voltage to Delta Cathode
Voltage vs Junction Temperature
1.2
1.1
1
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
-50
Iz=10mA
ΔVz=16V to VREF
Off-State Cathode Current---Iz
(off)(nA)
Off-State Cathode Current
vs Junction Temperature
250
V
REF
=0V
200
150
100
Vz=6V
50
0
Vz=16V
ΔVREF/ΔVz---(-mV/V)
-25
0
25
50
75
100
125
150
-50
-25
0
25
50
75
100
125
150
Junction Temperature---TJ(℃)
PL432XA3/N3
Junction Temperature---TJ(℃)
CYStek Product Specification
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