CYStech Electronics Corp.
Adjustable shunt regulator
Spec. No. : C504A3
Issued Date : 2003.03.21
Revised Date : 2013.10.23
Page No. : 1/15
TL432A3/N3/M3/K3
Description
TheTL432 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 18V with two
external resistors. The TL432 has a typical dynamic
output impedance of 0.2Ω. Active output circuitry
provides a very sharp turn on characteristic, making
the TL432 an excellent replacement for zener diodes.
The TL432 shunt regulator is available with two
voltage tolerances(0.5%, and 1% ), and four package
options(TO-92, SOT-23, SOT-89 and TO-92L).
This allows the designer the opportunity to select the
optimum combination of cost and performance for
their application.
Features
◆Low
voltage operation(down to 1.24V)
◆Fast
turn on response
◆Low
dynamic output impedance 0.2Ω typ.
◆Trimmed
bandgap design :
±0.5%
◆Sink
current capability : 100mA
◆Available
in TO-92, SOT-23, SOT-89, and
TO-92L packages
Applications
◆Linear
Regulators
◆Adjustable
Supplies
◆Switching
Power Supplies
◆Battery
Operated Computers
◆Instrumentation
◆Computer
Disk Drives
Typical Application Circuit
(Note 1,2)
Notes:
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)
TL432
TL432A3/N3/M3/K3
CYStek Product Specification
CYStech Electronics Corp.
Absolute Maximum Ratings
Parameter
Cathode Voltage
Continuous Cathode Current
Reference Input Current
Power Dissipation at T
A
=25℃
SOT-23
SOT-89
TO-92
TO-92L
Thermal Resistance
SOT-23
SOT-89
TO-92
TO-92L
Operating Ambient Temperature Range
Operating Junction Temperature Range
Storage Temperature Range
Symbol
Vz
I
Z
I
REF
Maximum
18
100
3
0.18
0.4
0.5
0.72
556
250
200
139
-40 to +85
-40 to +125
-65 to +150
Spec. No. : C504A3
Issued Date : 2003.03.21
Revised Date : 2013.10.23
Page No. : 2/15
Units
V
mA
mA
P
D
W
θ
JA
℃/W
T
A
T
J
Tstg
℃
℃
℃
Electrical Characteristics
Unless otherwise specified, TA=25℃. Values in bold apply over full operating ambient temperature range.
TL432 A-rank(±0.5%)
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,T
A
=-40~
105°C(Note 1)
ΔV
REF
I
Z
=10mA,
ΔV
Z
=18V 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
=18V(Note 3)
Min
1.234
-
-
-
-
-
-
-
Typ
1.240
10
-1
0.25
0.05
0.04
0.2
60
Max
1.246
20
-2.0
0.5
0.3
0.5
0.4
80
TL432 B-rank(±1%)
Min
1.228
-
-
-
-
-
-
-
Typ
Max
1.240 1.252
10
-1
0.25
0.05
0.04
0.2
60
20
-2.0
0.5
0.3
0.5
0.4
80
Unit
V
mV
mV/V
μA
μA
μA
Ω
μA
r
z
I
Z(MIN)
f <1kHz,V
Z
=V
REF
I
Z
=1mA to 100mA(Note 1)
V
Z
=V
REF
(Note 1)
Notes:
(1) See Test Circuit 1.
(2) See Test Circuit 2.
(3) See Test Circuit 3.
TL432A3/N3/M3/K3
CYStek Product Specification
CYStech Electronics Corp.
Test Circuits
Spec. No. : C504A3
Issued Date : 2003.03.21
Revised Date : 2013.10.23
Page No. : 3/15
TL432A3/N3/M3/K3
CYStek Product Specification
CYStech Electronics Corp.
Spec. No. : C504A3
Issued Date : 2003.03.21
Revised Date : 2013.10.23
Page No. : 4/15
Block Diagram
Cathode
Symbol
Cathode
REF
REF
VREF
Anode
Anode
Ordering Information
Device
TL432A3-A-TB-G
TL432A3-B-TB-G
TL432A3-A-BK-G
TL432A3-B-BK-G
TL432K3-A-TB-G
TL432K3-B-TB-G
TL432K3-A-BK-G
TL432K3-B-BK-G
TL432N3-A-T1-G
TL432N3-B-T1-G
TL432M3-A-T1-G
TL432M3-B-T1-G
Package
TO-92
(Pb-free lead plating and
halogen-free package)
TO-92L
(Pb-free lead plating and
halogen-free package)
SOT-23
(Pb-free lead plating and
halogen-free package)
SOT-89
(Pb-free lead plating and
halogen-free package)
Rank
A
B
A
B
A
B
A
B
A
B
A
B
Tolerance
±0.5%
±1%
±0.5%
±1%
±0.5%
±1%
±0.5%
±1%
±0.5%
3000 pcs / Tape & Reel
±1%
±0.5%
1000 pcs / Tape & Reel
±1%
Shipping
2000 pcs / Tape & Box
1000 pcs/ bag, 10 bags/box,
10boxes/carton
2000 pcs / Tape & Box
500 pcs/ bag, 10 bags/box,
10boxes/carton
TL432A3/N3/M3/K3
CYStek Product Specification
CYStech Electronics Corp.
Typical Characteristics
Cathode Current vs Cathode Voltage
300
150
Spec. No. : C504A3
Issued Date : 2003.03.21
Revised Date : 2013.10.23
Page No. : 5/15
Cathode Current vs Cathode Voltage
Cathode Current---IZ(μA)
Cathode Current---Iz(mA)
200
100
0
-100
-200
-300
-1
Vz=V
REF
TA=25℃
100
50
0
-50
-100
-150
-1.5
Vz=VREF
TA=25℃
-1
-0.5
0
0.5
1
1.5
-0.5
0
0.5
1
1.5
Cathode Voltage---Vz(V)
Cathode Voltage---Vz(V)
Reference Voltage vs Junction Temperature
1.248
Reference Input Current vs Junction Temperature
150
Reference Input Current---IREF(nA)
Reference Voltage---VREF(V)
1.246
1.244
1.242
1.24
1.238
1.236
1.234
-50
0
50
Iz=10mA
125
Iz=10mA
R1=10kΩ
R2=∞
100
IZ=60μA
75
100
150
50
-50
-25
0
25
50
75
100
125
150
Junction Temperature---TJ(℃)
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(℃)
Junction Temperature---TJ(℃)
TL432A3/N3/M3/K3
CYStek Product Specification
