UZHT2431C02 [ZETEX]
Adjustable Positive Standard Regulator, 1.24V Min, 15V Max, PBCY3, TO-92, 3 PIN;
| 型号： | UZHT2431C02 |
| 厂家： | 
ZETEX SEMICONDUCTORS |
| 描述： | Adjustable Positive Standard Regulator, 1.24V Min, 15V Max, PBCY3, TO-92, 3 PIN 输出元件 调节器 |
| 文件： | 总6页 (文件大小：174K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
HIGH TEMPERATURE ADJUSTABLE
PRECISION ZENER SHUNT REGULATOR
ZHT2431
ISSUE 1 JULY 1997
DEVICE DESCRIPTION
FEATURES
The ZHT2431 is a three terminal adjustable
shunt regulator offering excellent temperature
stability and output current handling capability
up to 25mA. The output voltage may be set to
any chosen voltage between 1.24 and 15 volts
by selection of two external divider resistors.
Surface mount SOT23 package
•
•
•
•
•
TO92 package
2.5% tolerance
Average temperature coefficient 50 ppm/°C
Temperature compensated for operation
over the full temperature range
The devices can be used as a replacement for
zener diodes in many applications requiringan
improvement in zener performance.
Programmable output voltage
100µA to 25mA current sink capability
Low output noise
•
•
•
•
The ZHT2431 is particularly used in the
feedback control loop of switch mode power
supplies. In this application the device 1.24 volt
reference enables the generation of low
voltage supplies, typically 3.3 volts or 3 volts.
-55° to 125° C operation
APPLICATIONS
Shunt regulator
•
The ZHT2431 is intended for use over the
extended operating range of -55°C to 125°C.
Series regulator
•
Voltage monitor
•
Over voltage/ under voltage protection
•
Switch mode power supplies
•
SCHEMATIC DIAGRAM
VZ
Vref
Gnd
ZHT2431
ABSOLUTE MAXIMUM RATING
15V
Power Dissipation (Tamb=25°C, Tjmax=150°C)
Cathode Voltage (VZ)
Cathode Current
SOT23
TO92
330mW
780mW
50mA
Operating Temperature
Storage Temperature
-55 to 125°C
-55 to 125°C
Recommended Operating Conditions
Cathode Voltage (min)VREF to (max) 15V
Cathode Current (min) 100µA to (max) 25mA
ELECTRICAL CHARACTERISTICS
TEST CONDITIONS (Unless otherwise stated):T
=25°C
amb
VALUE
PARAMETER
SYMBOL
UNITS CONDITIONS
MIN TYP MAX
1.21 1.24 1.27
Reference Voltage
2.5% Vref
V
IL=10mA (Fig1), VZ=Vref
Deviation of Reference Input Vdev
Voltage over Temperature
5.0 15.0 mV
IL=10mA, VZ=Vref
Ta=full range (Fig1)
Ratio of the change in
0.5 2.0 mV/V VZ from Vref to 10V
IZ=10mA (Fig2)
∆Vref
∆VZ
Reference Voltage to the
Change in Cathode Voltage
Reference Input Current
Iref
0.02 0.11 0.4
R1=10K, R2=O/C, lL=10mA
µA
µA
µA
(Fig2)
Deviation of Reference Input
Current over Temperature
0.02 0.2
R1=10K, R2=O/C, IL=10mA
Ta=full range (Fig2)
∆Iref
Minimum Cathode Current IZmin
for Regulation
30
100
Off-state Current
IZoff
RZ
10
30
2
VZ=15V, Vref =0V (Fig3)
µA
Dynamic Output
Impedance
0.25
VZ=Vref (Fig1), f=0Hz,
IL=10mA
Ω
Deviation of reference input voltage, Vdev, is defined as the maximum variation of the
reference input voltage over the full temperature range.
The average temperature coefficient of the reference input voltage, Vref is defined as:
V
dev x 1000000
Vref (ppm⁄ °C)=
Vmax
Vref (T1−T2)
The dynamic output impedance, Rz, is defined
∆VZ
as:
RZ =
∆IZ
When the device is programmed with two
external resistors, R1 and R2, (fig 2) , the
dynamic output impedance of the overall
circuit, R, is defined as:
Vmin
Vdev = Vmax - Vmin
R1
R =Rz 1+
R2
With a capacitance of greater than 100pF
between cathode and anode, minimum
cathode current must be 0.2mA.
T1
T2
Temperature
ZHT2431
TYPICAL CHARACTERISTICS
140
130
120
110
100
90
2
1
0
-1
-2
-3
-4
-5
80
-50 -25
0
25 50 75 100 125
0
5
10
15
Temperature (°C)
Cathode Voltage (V)
Reference Current v Temperature
Change in Vref v Cathode Voltage
26
24
22
20
18
16
14
10
1
0.1
-50 -25
25
50 75 100 125
100
1k
10k
100k
0
Temperature (°C)
Frequency (Hz)
Cathode Current v Temperature
Dynamic Impedance vs. Frequency
1.244
1.0
1.242
Iz=10mA
1.240
1.238
1.236
1.234
1.232
0.5
0
-50 -25
0
25 50 75 100 125
25
50
75
100
125
Temperature (°C)
Ambient Temperature (°C)
Reference Voltage v Temperature
Power Dissipation Derating
ZHT2431
TYPICAL CHARACTERISTICS
60
50
40
30
20
10
0
Ω
µ
100
1k
10k
100k
1M
Frequency (Hz)
IZ = 10mA, TA = 25°C
Test Circuit for Open Loop Voltage Gain
Gain v Frequency
120Ω
V
Input Monitor
2.0
1.0
Pulse
Generator
0
5.0
2.5
0
50Ω
TA = 25°C
0
100
200
300
400
500
Time (us)
Test Circuit for Pulse Response
Pulse Response
Vref < VZ < 20, IZ = 10mA, TA = 25°C
30
25
20
15
10
5
Input
150Ω
10k
100µF
0
10p 100p
1n
10n
.1µ
1µ
10µ
Load Capacitance(F)
Stablity Boundary Conditions
Test Circuit for Stability
Boundary Conditions
ZHT2431
APPLICATION CIRCUITS
V+
Vout
V+
Vout
R1
R1
Vref
Vref
R2
R2
R1
R2
R1
1 +
Vref
Vout =
Vout = 1 +
Vref
R2
SHUNT REGULATOR
HIGHER CURRENT SHUNT REGULATOR
V+
ZSR***
In
V+
Vout
R1
Out
30
Common
0.01µF
R1
Vref
R2
Vout
Vref
R2
Vout = Vref + Vreg
R1
Vout = 1 +
Vref
R2
R1
R2
Vout = 1 +
Vref
OUTPUT CONTROL OF A
THREE TERMINAL FIXED REGULATOR
SERIES REGULATOR
V+
V+
R1A
R1B
OUTPUT
INPUT
Vref
OUTPUT
2V
V
V
Vref
R2A
= V+
R2B
= 2.5V
V
SINGLE SUPPLY COMPARATOR
WITH TEMPERATURE
COMPENSATED THRESHOLD
OVER VOLTAGE / UNDER VOLTAGE
PROTECTION CIRCUIT
ZHT2431
DC Test Circuits
I
I
Input
V
Input
R1
V
Input
V
I
I
I
I
I
1µF
1µF
1µF
V
R2
V
Fig 3 Test Circuit for Off
State current
Fig 1 Test Circuit for Vz=Vref
Fig 2 Test Circuit for Vz>Vref
Voltage Regulator Connection Diagrams
SOT23 Package Suffix F
TO92 Package Suffix C
Top View
Bottom View
Ordering Information
Part Number Package
ZHT2431F02 SOT23
ZHT2431C02 TO92
Part Mark
24F
ZHT243102
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