1. Nie pracuje PC200. Czy choć na chwilę po włączeniu pojawia się napięcie na pin1 i pin 2 ? Jakie ? Czy te podane przez ciebie ostatnio napięcia są przy podłączonym CN300 (wydaje mi się, że tak)? 2. Odłącz CN300 i CN301, pomiędzy pin 4 i 3 CN301 podłącz sztuczne obciążenie (żarówka samochodowa 20-30W). Pomiędzy pin1 i pin2 CN300 daj opornik 20-25k Ohm . Uruchom zasilanie. Zasilacz, jeśli jest sprawny, powinien zadziałać - żarówka zaświeci (słabo , bo podłączona jest do 5V). Jak nie wystartuje, to opornik 20-25kOhm zamień na 10k Ohm. Sprawdzaj przy tym napięcie na pin1 i pin3 IC303. CDN.
TL1431
PROGRAMMABLE VOLTAGE REFERENCE
.
.
.
.
ADJUSTABLE OUTPUT VOLTAGE :
Vref to 36V
SINK CURRENT CAPABILITY : 1 to 100mA
TYPICAL OUTPUT IMPEDANCE : 0.2Ω
0.4% AND 0.25% VOLTAGE PRECISION
Z
TO92
(Plastic Package)
D
SO8
(Batwing Plastic Micropackage)
DESCRIPTION
The TL1431 is a programmable shunt voltage reference with guaranteed temperature stability over
the entire temperature range of operation.
The output voltage may be set to any value between Vref (approximately 2.5V) and 36V with two
external resistors.
The TL1431 operates with a wide current range
from 1 to 100mAwith a typical dynamic impedance
of 0.2Ω.
ORDER CODES
Part number
Temperature Range
o
o
TL1431C/AC
-20 C, +70 C
TL1431I/AI
-40 C, +105 C
o
o
Package
Z
D
•
•
•
•
PIN CONNECTIONS
TO92
(Top view)
SO8
(Top view)
8
7
6
5
Ca thode Ano de Reference
1
2
3
1
March 1998
2
3
4
1
2
3
4
5
6
7
8
- Cathode
- Anode
- Anode
- N.C.
- N.C.
- Anode
- Anode
- Reference
1/8
TL1431
ABSOLUTE MAXIMUM RATINGS
Symbol
VKA
IK
Iref
Toper
Tstg
Parameter
Cathode to Anode Voltage
Continuous Cathode Current Range
Reference Input Current Range
Operating Free-air Temperature Range
TL1431C/AC
TL1431I/AI
Storage Temperature Range
Value
37
-100 to +150
-0.05 to +10
-20 to +70
-40 to +105
-65 to +150
Unit
V
mA
mA
o
C
Value
Vref to 36
1 to 100
Unit
V
mA
o
C
OPERATING CONDITIONS
Symbol
VKA
IK
Parameter
Cathode to Anode Voltage
Cathode Current
ELECTRICAL CHARACTERISTICS
Tamb = 25oC (unless otherwise specified)
Symbol
Parameter
Vref
Reference Input Voltage - (figure 1)
o
Tamb = 25 C
VKA = Vref, IK = 10mA
Reference Input Voltage Deviation Over
Temperature Range - (figure 1, note1)
VKA = Vref, IK = 10mA, Tmin. ≤ Tamb ≤ Tmax.
Temperature Coefficient of Reference Input
Voltage - (note 2)
VKA = Vref, IK = 10mA, Tmin. ≤ Tamb ≤ Tmax.
Ratio of Change in Reference Input Voltage to
Change in Cathode to Anode Voltage - (figure 2)
IK = 10mA, ∆VKA = 36V to 3V
Reference Input Current - (figure 2)
IK = 10mA, R1 = 10kΩ, R 2 = ∞
Tamb = 25oC
Tmin. ≤ Tamb ≤ Tmax.
Reference Input Current Deviation Over
Temperature Range - (figure 2)
IK = 10mA, R1 = 10kΩ, R 2 = ∞
Tmin. ≤ Tamb ≤ Tmax.
Minimum Cathode Current for Regulation - (figure
1)
VKA = Vref
Off-State Cathode Current - (figure 3)
Dynamic Impedance - (figure 1, note 3)
VKA = Vref, ∆IK = 1 to 100mA, f ≤ 1kHz
∆Vref
∆Vref
∆T
∆Vref
∆VKA
Iref
∆Iref
Imin
Ioff
|ZKA|
Min.
TL1431C
Typ. Max.
Min.
TL1431AC
Typ. Max.
Unit
V
2.490
2.500 2.510 2.493
2.500
2.507
mV
3
20
3
20
ppm/ oC
±13
±90
±13
±90
mV/V
-2
-1.1
-2
-1.1
µA
1.5
2.5
3
1.5
2.5
3
µA
0.2
1.2
0.2
1.2
0.5
1
0.5
0.6
180
500
180
500
0.2
0.5
0.2
0.5
mA
Notes : 1. ∆Vref is defined as the difference between the maximum and minimum values obtained over the full temperature
range.
V ref ma x.
∆Vref = Vref max. - Vref min
V re fmin.
2.
Tempe ra tur e
T2
T1
The temperature coefficient is defined as the slopes (positive and negative) of the voltage vs temperature limits whithin
which the reference voltage is guaranteed.
-n
p
pm
/
C
/C
ppm
+ n
max
2.5V
min
25 C
3.
2/8
∆VKA
The dynamic Impedance is defined as |ZKA| =
∆IK
Te m pe ra ture
nA
Ω
TL1431
ELECTRICAL CHARACTERISTICS
Tamb = 25oC (unless otherwise specified)
Symbol
TL1431I
Parameter
Min.
∆Vref
Typ.
2.500 2.510 2.493
2.500
2.507
V
Ratio of Change in Reference Input Voltage to
Change in Cathode to Anode Voltage - (figure 2)
IK = 10mA, ∆VKA = 36 to 3V
Iref
mV
7
30
7
30
ppm/ oC
±22
±100
±22
±100
mV/V
-1.1
-2
-1.1
-2
µA
Reference Input Current - (figure 2)
IK = 10mA, R1 = 10kΩ, R 2 = ∞
Tamb = 25oC
Tmin. ≤ Tamb ≤ Tmax.
∆Iref
Max.
1.5
2.5
3
1.5
2.5
3
µA
Reference Input Current Deviation Over
Temperature Range - (figure 2)
IK = 10mA, R1 = 10kΩ, R 2 = ∞
Tmin. ≤ Tamb ≤ Tmax.
|ZKA|
Notes : 1.
1
0.8
1.2
0.5
1
0.5
0.7
Off-State Cathode Current - (figure 3)
Ioff
0.5
Minimum Cathode Current for Regulation
(figure 1)
VKA = Vref
Imin
Unit
Max.
Temperature Coefficient of Reference Input
Voltage - (note 2)
VKA = Vref, IK = 10mA, Tmin. ≤ Tamb ≤ Tmax.
∆Vref
∆VKA
Min.
Reference Input Voltage Deviation Over
Temperature Range - (figure 1, note1)
VKA = Vref, IK = 10mA, Tmin. ≤ Tamb ≤ Tmax.
∆Vref
∆T
Typ.
2.490
Reference Input Voltage - (figure 1)
o
Tamb = 25 C
VKA = Vref, IK = 10mA
Vref
TL1431AI
180
500
180
500
Dynamic Impedance - (figure 1, note 3)
VKA = Vref, ∆IK = 1 to 100mA, f ≤ 1kHz
0.2
0.5
0.2
0.5
mA
nA
Ω
∆Vref is defined as the difference between the maximum and minimum values obtained over the full temperature
range.
∆Vref = Vref max. - Vref min
V re fma x.
V ref min.
T1
2.
-n
max
2.5V
min
3.
Tempera ture
T2
The temperature coefficient is defined as the slopes (positive and negative) of the voltage vs temperature limits whithin
which the reference voltage is guaranteed.
∆VKA
The dynamic Impedance is defined as |ZKA| =
∆IK
pp
m
/
C
/C
p
pm
+ n
25 C
Te m pe ra ture
3/8
TL1431
Figure 1 : Test Circuit for VKA = Vref
Figure 2 : Test Circuit for VKA & gt; Vref
V
Input
I
KA
VKA
Input
IK
K
R1
I re f
R2
V
ref
Vre f
VKA = Vref (1 +
Figure 3 : Test Circuit for Ioff
R1
) + Iref . R1
R2
Figure 4 : Test Circuit for Phase Margin and
Voltage Gain
VKA = 36V
Input
Vka
10µF
Output
I off
Ik=10mA
15K
10µF
Input
4/8
8.25K
Iref
Vref
230
TL1431
DRIFT (mV) vs TEMPERATURE (oC)
CATHODE CURRENT vs CATHODE VOLTAGE
Vka = Vre f
Ik = 10mA
Vka = Vre f = 2.5V
Vref drift (mV)
0
-2
-4
-6
-8
-10
-12
-14
-40
-20
0
20
40
60
80
100
120
Temperature (°C)
CATHODE CURRENT vs CATHODE VOLTAGE
(detailed version)
REFERENCE CURRENT vs TEMPERATURE
Ik = 10mA
Vka = Vref
Vka = Vref
Iref (µA)
2
1,8
1,6
1,4
1,2
1
OFF-STATE CATHODE CURRENT vs
TEMPERATURE
-40
-20
0
20
40
60
Temperature (°C)
80
100
120
RATIO OF CHANGE IN Vref TO CHANGE IN
VKA vs TEMPERATURE
Ik = 10mA
Vka = Vref = 2.5V
d(Vref) / d(Vka ) (mV/V)
Ioff (µA)
-0,9
0,1
-1
0,08
-1,1
0,06
-1,2
0,04
-1,3
-1,4
0,02
-1,5
0
-40
-20
0
20
40
60
Temperature (°C)
80
100
120
-1,6
-40
-20
0
20
40
60
Temperature (°C)
80
100
120
5/8
TL1431
DRIFT OF RKA vs TEMPERATURE
MINIMUM OPERATING CURRENT vs
TEMPERATURE
Ik = 10mA
Vka = Vref = 2.5V
Ik = Ikmin.
Vka = Vref
Drift (Ohms)
Imin (mA)
0
0,52
0,5
-0,01
0,48
-0,02
0,46
0,44
-0,03
0,42
0,4
-0,04
-40
-20
0
20
40
60
80
100
120
-40
-20
0
Temperature (°C)
PHASE MARGIN vs FREQUENCY
20
40
60
Temperature (°C)
80
100
120
STABILITY FOR CAPACITIVE LOADS
Ik = 10mA
Phase (°)
Gain (dB)
60
200
Gain
Current (mA)
120
50
100
40
100
30
0
80
20
Phase
60
10
40
0
-10
20
-1 00
-20
0
1E-10
1E-9
-30
-2 00
1
3
10
30
1 00
3 00
Frequency (KHz)
6/8
1,000
3,000
-40
10,000
1E-8
1E-7
0,000001
Capacitive loads (F)
2.5V
5.0V
10 V
15 V
20 V
28 V
0,00001
TL1431
PACKAGE MECHANICAL DATA
8 PINS - BATWING PLASTIC MICROPACKAGE (SO)
Dimensions
A
a1
a2
a3
b
b1
C
c1
D
E
e
e3
F
L
M
S
Min.
Millimeters
Typ.
0.1
0.65
0.35
0.19
0.25
Max.
1.75
0.25
1.65
0.85
0.48
0.25
0.5
Min.
Inches
Typ.
0.026
0.014
0.007
0.010
Max.
0.069
0.010
0.065
0.033
0.019
0.010
0.020
0.189
0.228
0.197
0.244
0.004
o
45 (typ.)
4.8
5.8
5.0
6.2
1.27
3.81
3.8
0.4
0.050
0.150
4.0
1.27
0.6
0.150
0.016
0.157
0.050
0.024
o
8 (max.)
7/8
TL1431
PACKAGE MECHANICAL DATA
3 PINS - PLASTIC PACKAGE TO92
Dimensions
L
B
O1
C
K
O2
a
Min.
3.2
4.45
4.58
12.7
0.407
0.35
Millimeters
Typ.
1.27
3.7
5.00
5.03
0.5
Max.
Min.
4.2
5.2
5.33
0.126
0.1752
0.1803
0.5
0.016
0.0138
0.508
Inches
Typ.
0.05
0.1457
0.1969
0.198
0.1654
0.2047
0.2098
0.0197
0.02
Max.
Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsibility
for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result
from its use. No license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics.
Specification mentioned in this pub lication are subject to change without notice. This publication supersedes and replaces all
information previously supplied. SGS-THOMSON Microelectronics products are not authorized for use as critical components in life
support devices or systems without express written approval of SGS-THOMSON Microelectronics.
© 1998 SGS-THOMSON Microelectronics – Printed in Italy – All Rights Reserved
SGS-THOM SON Microelectronics GROUP OF COMPANIES
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8/8
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