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PDF CS3972 Data sheet ( Hoja de datos )
| Número de pieza | CS3972 | |
| Descripción | 1.25A High Efficiency Switching Regulator | |
| Fabricantes | Cherry Semiconductor Corporation | |
| Logotipo |  |
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CS3972
1.25A High Efficiency Switching Regulator
Description
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 VC voltage
of less than 0.2V with a duration of
about 0.5µs to VC 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.
Block Diagram
VIN
2.3V
Reg
40kHz
OSC
Logic
Output
Protection
Driver
VSW
1.25A,
75V
Switch
Features
s S75wViMtcAhX, 2APEAK Internal
s 3V to 60V Input Voltage
Range
s 6mA Input Supply
Current
s 1.24V Precision Reference
s 40kHz Switching
Frequency
s Variable Current Limit
with External Voltage
Clamp
s Under-Voltage Protection
s Over-Temperature
Protection
s External Synchronization
Package Options
16L SO Wide
NC 1
VC
VFB
NC
NC
NC
NC
NC
Gnd
NC
E2
VSW
NC
E1
NC
VIN
COMP
+-
VC
VFB -
Error
Amp
+
1.24V
Ref
+
Current
Amp
-
0.22Ω
0.22Ω
*Always connect E1 to Ground Pin on DIP package. Both emitters are tied to ground on TO-220 Package.
Rev. 6/23/99
1
8L PDIP
5L TO-220
Tab (Gnd)
E2*
E1*
Gnd
Gnd 1
VC
VFB
NC
E2
VSW
E1
VIN
1
1 VC
2 VFB
3 Gnd
4 VSW
5 VIN
Cherry Semiconductor Corporation
2000 South County Trail, East Greenwich, RI 02818
Tel: (401)885-3600 Fax: (401)885-5786
Email: [email protected]
Web Site: www.cherry-semi.com
A Company
®
1 page  
Package Specification
PACKAGE DIMENSIONS IN mm (INCHES)
PACKAGE THERMAL DATA
Lead Count
8 Lead PDIP
16 Lead SO Wide
Metric
Max Min
10.16 9.02
10.50 10.10
D
English
Max Min
.400 .355
.413 .398
Thermal Data
RΘJC
RΘJA
typ
typ
5L
TO-220
1.7
50
8L
PDIP
52
100
16L
SO Wide
23
105
˚C/W
˚C/W
Plastic DIP (N); 300 mil wide
7.11 (.280)
6.10 (.240)
3.68 (.145)
2.92 (.115)
8.26 (.325)
7.62 (.300)
1.77 (.070)
1.14 (.045)
2.54 (.100) BSC
.356 (.014)
.203 (.008)
REF: JEDEC MS-001
0.39 (.015)
MIN.
.558 (.022)
.356 (.014)
D
Some 8 and 16 lead
packages may have
1/2 lead at the end
of the package.
All specs are the same.
Surface Mount Wide Body (DW); 300 mil wide
7.60 (.299)
7.40 (.291)
10.65 (.419)
10.00 (.394)
0.51 (.020)
0.33 (.013)
2.49 (.098)
2.24 (.088)
1.27 (.050) 0.32 (.013)
0.40 (.016) 0.23 (.009)
REF: JEDEC MS-013
5
D
1.27 (.050) BSC
2.65 (.104)
2.35 (.093)
0.30 (.012)
0.10 (.004)
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet CS3972.PDF ] | |
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