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PDF KA3502 Data sheet ( Hoja de datos )
| Número de pieza | KA3502 | |
| Descripción | PC SMPS Supervisory IC | |
| Fabricantes | Fairchild | |
| Logotipo |  |
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KA3502
PC SMPS Supervisory IC
www.fairchildsemi.com
Features
• Complete Housekeeping Circuit
• Few External Components
• Over Voltage Protection for 3.3V/5V/12V/Adj. Output
• Over Current Protection for 3.3V/5V/12V Output
• Open-Collector Output and Remote On/Off Function
• Remote On/Off Delay Time Control
• Precision Voltage Reference for Outputs, 5V/12V
• Uncommitment Precision Voltage Reference for +5Vs
• Power Good Signal Generator with Hysteresis
• Disable Logic of 3.3V, 5V, 12V for Complete Shutdown
Descriptions
The KA3502 is complete housekeeping circuitry for use in
the secondary side of SMPS(Switched Mode Power Supply).
It contains various functions, which are two Precision Volt-
age References, Over Voltage/Current Protection, Remote
On/Off Control, Power Good Signal Generator, Disable
Logic and etc.
20-DIP
Internal Block Diagram
1
V33 V5 V12
123
PWM FB1 VREF1 UV
6 15 14 11
VCC
5
Adj 4
Vcc
+
+
+
+
- COMP1
1.26V
Tsur 17
IS5 19
IS33 20
IS12 18
2.7V
-+
50mV
Vcc
+
-
COMP2
Vcc
-+
135mV
+
-
COMP3
Vcc
+
-+ - COMP4
65mV
Vcc
+
- COMP5
2V
Vcc
+
-
COMP6
1.4V
R7
7
REM
Ion
S Vcc
Q
R
2.8V
Ion+
Ioff
R8 R10
1k 39k
Vcc
+
-
2V↔0.7V
R9 R13 5.2V
10k
Vcc
+ COMP7
-
Q1
REFERENCE1
Vcc
+
-
COMP8
R11
5.4k
R12
1.28V↔1.24V
R14
Ichg
R15
5.1k
+
Q3
-
COMP9
9
PG
2V↔1.3V
Q2
12
FB2
13
REFERENCE2
VREF2
8
Trem
16
GND
10
Topr
©2000 Fairchild Semiconductor International
Rev. 5.0
1 page  
KA3502
Electrical Characteristics (Vcc = 18V, Ta = 25°C)
Parameter
Symbol
Condition
Min.
PROTECTION SECTION
Over Voltage Protection For 3.3 V
Vovp33 Pin 7 (REM)=0V
3.8
Over Voltage Protection For 5 V
Vovp5 Pin 7 (REM)=0V
5.8
Over Voltage Protection For 12 V
Vovp12 Pin 7 (REM)=0V
13.4
OVP Input Threshold Voltage for Adj
Vadj Pin 7 (REM)=0V
1.22
Comparator Offset Voltage for 3.3 V Vos33 Pin 7 (REM)=0V
125.5
Comparator Offset Voltage for 5 V
Vos5 Pin 7 (REM)=0V
46.5
Comparator Offset Voltage for 12 V
Vos12 Pin 7 (REM)=0V
60.5
OCP Delay Comparator Input
Threshold Voltage
Vth (Tsur) Pin 7 (REM)=0V
1.9
Pin 17 (Tsur) Input Clamp Voltage
V17max Pin 7 (REM)=0V
-
REMOTE ON/OFF SECTION
Remote On/off Input Threshold Vtg.
Vth Pin 7 (REM): “L”→”H”
1
Remote On/off Input Open Voltage
Vih Pin 7 Open
4
Remote On/off Input Low Current
Iil Pin 7 (REM)=0 V
0
ON Delay Time
Ton REM: “L”→“H”, C=0.1 uF 4
OFF Delay Time
Toff REM: “L”→“H”, C=0.1 uF 16
PWM Saturation Voltage
Vsat Io=0.5 mA
(PWM)
-
PWM Leakage Current
Ileak Pin 6 (PWM)=20 V
-
REFERENCE 1 SECTION
Reference Input Voltage 1
Vref1 IIk1=1 mA
2.46
Line Regulation 1
Vref1 (line) 15 V<Vcc<20 V
-
Current Stability 1
∆ Vref1 Ik1=1 mA to 10 mA
-
Output Sinking Current Capability 1
Isink1
- 15
Absolute Precision of Internal Three
Resistors
Rint
--
Matching Coefficient of Internal Three Rrate - -
Resistors
Temperature Stability
∆ Vref1 Ta=0 to 70°C (Note 1)
-
Gain Bandwidth 1
GBW1 GV=1 (Note 1)
-
Typ.
4.0
6.1
14.2
1.26
135
50
65
2
2.7
-
-
-
8
24
-
0.01
2.50
1
5
25
± 15
±1
13
1
Max.
4.2
6.4
15.0
1.30
144.5
53.5
69.5
2.1
4
1.8
5.25
-1.0
14
34
1.3
1
2.54
-
20
-
-
-
17
-
Unit
V
V
V
V
mV
mV
mV
V
V
V
V
mA
msec
msec
V
uA
V
mV/V
mV
mA
%
%
mV
MHz
5
5 Page 
Mechanical Dimensions
Package
KA3502
Dimensions in millimeters
20-DIP
11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet KA3502.PDF ] | |
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