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CS5124 Datasheet(PDF) 1 Page - Cherry Semiconductor Corporation

Part No. CS5124
Description  High Performance, Integrated Current Mode PWM Controllers
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Maker  CHERRY [Cherry Semiconductor Corporation]
Homepage  http://www.cherrycorp.com/
Logo CHERRY - Cherry Semiconductor Corporation

CS5124 Datasheet(HTML) 1 Page - Cherry Semiconductor Corporation

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V
CC
BIAS
UVLO
SS
Gnd
GATE
IS
V
FB
R8
0.39Ω
Q2
IRFR220
R5
17.4k
C2
1.5µF,
100V
C1
0.1µF,
100V
R2
200k
10µH
36-75VIN
L1
R1
510k
Q1
ZVN3310A
T1
D1
MBRD360CT
R3
47Ω
R6
1k
C3
.022µF
C6
.01µF
R7
30.1k
C5
47µF,
10V
ISOLATED
RTN
5VOUT
ENABLE
48VRTN
D4
R4
10Ω
BAS16LT1
C4
0.47µF,
25V
C8
1000pF
C7
0.1µF
TPS5908
U2
R9
10.0k
C9
1000pF
CS5124
CTX15-14514
Features
s
Line UVLO Monitoring
s
Low Current Sense
Voltage for Resistive
Current Sensing
s
External Synchronization
to Higher or Lower
Frequency Oscillator
(CS5126 Only)
s
Bias for Start up Circuitry
(CS5124 Only)
s
Thermal Shutdown
s
Sleep On/Off Pin
s
Soft Start Timer
s
Leading Edge Blanking
s
Direct Optocoupler
Interface
s
90ns Propagation Delay
s
35ns Driver Rise and Fall
Times
s
Sleep Mode
Package Options
High Performance, Integrated Current Mode
PWM Controllers
CS5124/6
Description
Applications Diagram
8 Lead SO Narrow
1
1
VCC
BIAS
UVLO
SS
Gnd
GATE
ISENSE
VFB
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
®
Rev. 3/12/99
Gnd
UVLO
1
VCC
SYNC
SS
GATE
ISENSE
VFB
CS5124
CS5126
48V to 5V, 1A flyback converter using the CS5124
The CS5124/6 is a fixed frequency
current mode controller designed
specifically for DC-DC converters
found in the telecommunications
industry. The CS5124/6 integrates
many commonly required current
mode power supply features and
allows the power supply designer to
realize substantial cost and board
space savings. The product matrix is
as follows:
CS5124: 400kHz w/VBIAS Pin,
195mV first current sense threshold
CS5126: 200kHz w/SYNC Pin,
335mV first current sense threshold
The CS5124/6 integrates the follow-
ing features: Internal Oscillator, Slope
Compensation, Sleep On/Off, Under
Voltage Lock Out, Thermal
Shutdown, Soft Start Timer, Low
Voltage Current Sense for Resistive
Sensing, Second Current Threshold
for Pulse by Pulse Over Current
Protection, a Direct Optocoupler
Interface and Leading Edge Current
Blanking.
The CS5124/6 has supply range of
7.7V to 20V and is available in 8 pin
SO narrow package.


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