CS5124 Datasheet, PDF (1/10 Pages) Cherry Semiconductor Corporation – High Performance, Integrated Current Mode PWM Controllers

CS5124/6
High Performance, Integrated Current Mode
PWM Controllers
Description
Features
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/V_BIAS 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.
Applications Diagram
36-75VIN
L1
10µH
C1
0.1µF,
100V
R2
200k
R1
510k
C2
1.5µF,
100V
R5
17.4k
Q1
ZVN3310A _D4
R4 _BAS16LT1
10Ω
C4
0.47µF,
25V
ENABLE
C9
1000pF
C7
0.1µF
V_CC
Gnd
BIAS GATE
UVLO IS
CS5124
SS
V_FB
48VRTN
CTX15-14514
T1
D1
MBRD360CT
Q2
IRFR220
R8
0.39Ω
R3
47Ω
C3
.022µF
R7
R6 30.1k
1k
C6
U2
.01µF
C8
1000pF
TPS5908
R9
10.0k
5VOUT
C5
47µF,
10V
ISOLATED
RTN
48V to 5V, 1A flyback converter using the CS5124
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
8 Lead SO Narrow
CS5124
V_{CC 1}
Gnd
BIAS
UVLO
SS
GATE
I_SENSE
V_FB
CS5126
V_{CC 1}
Gnd
UVLO
SYNC
SS
GATE
I_SENSE
V_FB
Rev. 3/12/99
Cherry Semiconductor Corporation
2000 South County Trail, East Greenwich, RI 02818
Tel: [phone] Fax: [phone]
Email: [e-mail]
Web Site: www.cherry-semi.com
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