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參數資料
| 型號： | CS3972 |
| 廠商： | ON SEMICONDUCTOR |
| 英文描述： | 1.25A High Efficiency Switching Regulator(1.25A,75V輸出,高效率開關穩壓器) |
| 中文描述： | 1.25A的高效率開關穩壓器（電流1.25A，75V的輸出，高效率開關穩壓器） |
| 文件頁數： | 1/8頁 |
| 文件大小： | 90K |
| 代理商： | CS3972 |
1
Output
Protection
Driver
Reg
Logic
OSC
Error
Amp
-
+
1Ref
Current
Amp
-
+
VSW
VC
VIN
VFB
0.22
0.22
COMP
E1*
E2*
Gnd
*Always connect E1 to Ground Pin on DIP package. Both emitters are tied to ground on TO-220 Package.
175V
Switch
-
+
C
1.25A High Efficiency Switching Regulator
CS3972
Description
Block Diagram
Features
I
75V
, 2A
PEAK
Internal
Switch
3V to 60V Input Voltage
Range
6mA Input Supply
Current
1.24V Precision Reference
40kHz Switching
Frequency
Variable Current Limit
with External Voltage
Clamp
Under-Voltage Protection
Over-Temperature
Protection
External Synchronization
I
I
I
I
I
I
I
I
Package Options
5L TO-220
Tab (Gnd)
8L PDIP
1
Gnd
V
C
V
FB
NC
E
2
V
SW
E
1
V
IN
1
1 V
C
2 V
FB
3 Gnd
4 V
SW
5 V
IN
16L SO Wide
1
Gnd
NC
NC
NC
NC
V
IN
E
1
V
SW
E
2
V
C
V
FB
NC
NC
NC
NC
NC
The CS3972 is a 1.25A, 60V, current
mode, high efficiency, switching
regulator circuit. It can be config-
ured in buck, boost, forward, iso-
lated and non-isolated topologies,
using a single-ended switch.
The IC contains a 1.25A high effi-
ciency output switch, precision
bandgap reference, voltage regula-
tor, error amplifier, oscillator, con-
trol, and protection circuitry.
Output transistor efficiency is
achieved by keeping the switch in
quasi-saturation when it is on. This
minimizes the switch turn-off
delay time and power dissipation,
an important consideration for
applications with wide ranging
loads.
The precision reference is internally
trimmed to 1.24V, while the oscilla-
tor frequency is internally trimmed
to 40kHz. The on board 2.3V regu-
lator powers the internal circuitry.
By keeping the voltage regulator at
2.3V, the IC is able to operate down
to 3V and maintain a constant input
supply current of 6mA(typ).
Synchronization mode is achieved
by applying a pulsating V
voltage
of less than 0.2V with a duration of
about 0.5μs to V
pin. The switch-
ing frequency can be adjusted from
50kHz to 70kHz. The IC's synchro-
nization mode is set externally.
Protection circuitry includes a vari-
able current limit with external
voltage clamp, under-voltage and
over-temperature protection.
June, 1999 - Rev. 8
ON Semiconductor
2000 South County Trail, East Greenwich, RI 02818
Tel: (401)885–3600 Fax: (401)885–5786
N. American Technical Support: 800-282-9855
Web Site: www.cherry–semi.com
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