KA3501 [FAIRCHILD]
PC SMPS Supervisory IC; PC开关电源监控IC
| 型号： | KA3501 |
| 厂家： | 
FAIRCHILD SEMICONDUCTOR |
| 描述： | PC SMPS Supervisory IC |
| 文件： | 总6页 (文件大小：44K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
www.fairchildsemi.com
KA3501
PC SMPS Supervisory IC
Features
Description
• Complete House Keeping Circuit
• Few External Components
• Positive Voltage Protection
The KA3501 is complete housekeeping circuits for use in the
secondary side of SMPS(Switched Mode Power Supply).
This IC(Integrated Circuit) contains a precision voltage
reference, protection circuits and a power good signal
generator. It also has a high current drive output for use in
conjunction with an external "crowbar" SCR. The reference
voltage is trimmed to ±2% for correct output voltages(+5V/
+12V) and power good signal generator is to monitor the
voltage level of power good supply for safe operation in a
microprocessor circuit. Using the KA3501 requires few
external components to accomplish a complete
• Negative Voltage Protection
• High Current Drive Output for SCR
• Precision Voltage Reference for 5V/12V Outputs
• Power Good Signal Generator with Hysteresis
housekeeping circuit for SMPS(Switched Mode Power
Supply). The KA3501 is available in an 14-pin DIP.
14-DIP
1
Internal Block Diagram
4
V
1(+5V)
CC
V
CC
8
7
Vin1
Positive
Voltage
Protection
+5V
Detecting
START UP
lchg
COMP
11
Vin2
5
Negative
Voltage
Protection
PG
INTERNAL
BIAS
GATE
6
12
V
CC
Feedback
14
Detecting
COMP
Ve
+2.5V
REFERENCE
VOLTAGE
2
Vref
V
CC
2(+12V)
1
9
10
Timing
13
GND
3
Vcont
Td
Rev. 1.0.2
©2002 Fairchild Semiconductor Corporation
KA3501
Pin Assignments
#14
Feedback
#1
Vcont
GND
Ve
Vref
K
A
3
5
0
1
Vcc2
PG
Vcc1
Vin2
Gate
Timing
Td
Vcc
Vin1
#7
#8
Pin Number
Pin Name
Vcont
Vref
Pin Function Description
1
2
Reference Voltage Control
Precision Reference Voltage
+12V Output Voltage
+5V Output Voltage
UVP Input (Negative)
Gate Drive Input for SCR
Supply Voltage
3
Vcc2
Vcc1
Vin2
4
5
6
Gate
Vcc
7
8
Vin1
PG Input
9
Td
Reference Voltage Delay for PG
PG Delay
10
11
12
13
14
Timing
PG
PG Output
Ve
PG Ground (Open Emitter)
Ground
GND
Feedback
Feedback for Precision Reference
Absolute Maximum Rating ( Ta = 25°C)
Parameter
Symbol
Vcc(min)
Vcc(max)
Vuv
Value
5
Unit
V
Supply Minimum Voltage
Supply Maximum Voltage
UV Input Voltage
35
V
24
V
Minimum Gate Drive Current
Operating Cathode Current
Power Dissipation
I
-25
V
DR
I
1 to 30
1
A
K
Pd
W
°C
Operating Temperature Range
Topr
0 to 70
2
KA3501
Electrical Characteristic
(Refer to the test circuit , Vcc=20V, Ta=25°C, unless otherwise stated)
Parameter
Symbol
Conditions
Min. Typ. Max. Unit
Temperature Stability for V
PROTECTION SECTION
Positive Protection Voltage
∆V
-
-
17
-
mV
REF
REF
V
-
5.7
-1.5
8.5
6.0
6.4
V
V
POSI
Negative Protection Voltage
Negative Input Resistor
Gate Drive Current
V
Vcc1 = 5V
Pin 4 to Pin 5
= 0.7 V
-2.5 -3.5
NEGA
NEGA
R
10
11.5
-
kΩ
V
I
V
-25
-50
DR
GATE
REFERENCE SECTION
Reference Input Voltage
Current Stability
V
I = 10mA
2.44 2.50 2.56
V
mV
%
REF
K
∆V
I =1mA to 10mA
K
-
-
-
-
-
5
-
20
±20
±3
17
-
REF
Rint
Rrate
∆V
Absolute Precision of Internal Three Resistors
Relative Deviation of Three Resistors
Temperature Stability (Note1)
Gain Bandwidth (Note1)
POWER GOOD SECTION
Detecting Input Voltage
Detecting PG Voltage
-
-
±0.5
13
1
%
Ta = 0 to 70 °C
GV = 1
mV
MHz
REF
GBW
V
-
-
-
-
-
-
1.23 1.28 1.33
V
V
IN1
V
DET
4.1
10
200
-8
4.3
20
4.5
40
-
Hysteresis Voltage 1
HY1
HY2
mV
mV
uA
kΩ
V
Hysteresis Voltage 2
250
-14
Charging Current for PG Delay
PG Output Resistor
I
-20
CHG
R
7.7
-
9.0 10.3
PG
PG Output Saturation Voltage
PG Output Leakage Current
TOTAL STANDBY CURRENT
Supply Current
V
I
= 6mA
-
0.2
0.4
1
SAT
SINK
I
-
0.01
uA
O(LKG)
Icc
V
= 20V , V
= 5V
CC1
-
3
5
mA
CC
Note:
1.These parameters, although guaranteed, are not 100% tested in production
3
KA3501
Mechanical Dimensions
Package
Dimensions in millimeters
14-DIP
6.40 ±0.20
0.252 ±0.008
#1
#14
#7
#8
7.62
0.300
3.25 ±0.20
0.128 ±0.008
0.20
MIN
0.008
3.30 ±0.30
0.130 ±0.012
5.08
MAX
0.200
4
KA3501
Ordering Information
Product Number
Package
14-DIP
Operating Temperature
KA3501
0°C ~ +70°C
5
KA3501
DISCLAIMER
FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY
PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY
LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER
DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS.
LIFE SUPPORT POLICY
FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES
OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR
CORPORATION. As used herein:
1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the body,
or (b) support or sustain life, and (c) whose failure to
perform when properly used in accordance with
instructions for use provided in the labeling, can be
reasonably expected to result in a significant injury of the
user.
2. A critical component in any component of a life support
device or system whose failure to perform can be
reasonably expected to cause the failure of the life support
device or system, or to affect its safety or effectiveness.
www.fairchildsemi.com
10/9/02 0.0m 001
Stock#DSxxxxxxxx
2002 Fairchild Semiconductor Corporation
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