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參數(shù)資料
| 型號： | CS3972YTHA5 |
| 廠商： | ZF Electronics Corporation |
| 英文描述： | Hook-Up Wire; Conductor Size AWG:20; No. Strands x Strand Size:10 x 30; Jacket Color:White; Approval Bodies:UL, CSA; Approval Categories:UL AWM Style 1015, CSA Type TEW, JQA-F-, Passes VW-1 Flame Test; Conductor Material:Copper RoHS Compliant: Yes |
| 中文描述： | 1.25A的高效率開關(guān)穩(wěn)壓器 |
| 文件頁數(shù)： | 1/6頁 |
| 文件大?。?/td> | 186K |
| 代理商： | CS3972YTHA5 |
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
MAX
, 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
C
voltage
of less than 0.2V with a duration of
about 0.5μs to V
C
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.
Rev. 6/23/99
Cherry Semiconductor Corporation
2000 South County Trail, East Greenwich, RI 02818
Tel: (401)885-3600 Fax: (401)885-5786
Email: info@cherry-semi.com
Web Site: www.cherry-semi.com
A
Company
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