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CS51033 Datasheet(PDF) 1 Page - Cherry Semiconductor Corporation

Part # CS51033
Description  Fast PFET Buck Controller Does Not Require Compensation
PDF  8 Pages
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Manufacturer  CHERRY [Cherry Semiconductor Corporation]
Direct Link  http://www.cherrycorp.com/
Logo CHERRY - Cherry Semiconductor Corporation

CS51033 Datasheet(HTML) 1 Page - Cherry Semiconductor Corporation

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1
Features
CS
VFB
VCC
VGATE
Gnd
COSC
U1
CS51033
COSC
150pF
IRF 7404
3.3VIN
1.5VOUT
@3Amp
C1
0.1µF
VC
PGnd
Gnd
C3
100µF
C2
1µF
D3
1N4148
D2
1N4148
CS
0.1µF
C4
C0
D1
1N5821
4.7µH
CIN
100µF
D4
1N5818
Gnd
RA
1.5k
RB
300
NOTE: Capacitors C2, C3 and C4 are low ESR tantalum
caps used for noise reduction.
RG
10Ω
RC
10Ω
.1µF
100µF
100µF
0.1µF
100
0.01µF
s
1A Totem Pole Output
Driver
s
High Speed Oscillator
(700kHz max)
s
No Stability
Compensation Required
s
Lossless Short Circuit
Protection
s
2% Precision Reference
s
Programmable Soft Start
Package Options
Fast PFET Buck Controller
Does Not Require Compensation
CS51033
Description
The CS51033 is a switching con-
troller for use in DC-DC converters.
It can be used in the buck topology
with a minimum number of exter-
nal components. The CS51033 con-
sists of a 1.0A power driver for con-
trolling the gate of a discrete P-
channel transistor, fixed frequency
oscillator, short circuit protection
timer, programmable soft start, pre-
cision reference, fast output voltage
monitoring comparator, and output
stage driver logic with latch.
The high frequency oscillator
allows the use of small inductors
and output capacitors, minimizing
PC board area and systems cost.
The programmable soft start
reduces current surges at start up.
The short circuit protection timer
significantly reduces the PFET duty
cycle to approximately 1/30 of its
normal cycle during short circuit
conditions.
The CS51033 is available in 8L SO
and 8L PDIP plastic packages.
Typical Application Diagram
1
VGATE
PGnd
COSC
Gnd
VC
CS
VCC
VFB
8 Lead SO Narrow & PDIP
A
Company
®
Rev. 2/13/98
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


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