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| CS5661 Datasheet, PDF (1/8 Pages) Cherry Semiconductor Corporation – High Performance Dual Channel Current Mode Controller with ENABLE | |||
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CS5661
High Performance Dual Channel
Current Mode Controller with ENABLE
Description
Features
The CS5661 is a high performance,
fixed frequency, dual current mode
controller specifically designed for
Off-Line and DC to DC converter
applications. It offers the designer a
cost effective solution with minimal
external components. This integrat-
ed circuit features a unique oscilla-
tor for precise duty cycle limit and
frequency control, a temperature
compensated reference, two high
gain error amplifiers, two current
sensing comparators, and two high
current totem pole outputs ideally
suited for driving power MOSFETs.
VOUT2 output is switchable via the
ENABLE2 pin.
Also included are protective fea-
tures consisting of input and refer-
ence undervoltage lockouts, each
with hysteresis, cycle-by-cycle cur-
rent limiting, and a latch for single
pulse metering of each output.
The CS5661 is pin compatible with
the MC34065L.
Block Diagram
VCC
VREF
5.0V Ref
VREF
Undervoltage
Lockout
VCC
Undervoltage
Lockout
s Oscillator has Precise
Duty Cycle
Limit and Frequency
Control
s 500kHz Current Mode
Operation
s Automatic Feed Forward
Compensation
s Separate Latching PWMs
for Cycle-By-Cycle
Current Limiting
s Internally Trimmed
Reference with
Undervoltage Lockout
s Switchable Second
Output
s Two High Current Totem
Pole Outputs
s Input Undervoltage
Lockout with Hysteresis
s 8.4V Start Up Voltage
Threshold
SYNC
CT
RT
VFB1
COMP1
ENABLE2
VFB2
COMP2
Oscillator
+
-
Error
Amp 1
+
-
Error
Amp 2
Gnd
Latching
PWM 1
Latching
PWM 2
Pwr Gnd
VOUT1
Sense1
VOUT2
Sense2
Package Options
16 Lead SO Wide
SYNC 1
CT 2
RT 3
VFB1 4
COMP1 5
SENSE1 6
VOUT1 7
Gnd 8
16 VCC
15 VREF
14 ENABLE2
13 VFB2
12 COMP2
11 SENSE2
10 VOUT2
9 Pwr Gnd
December, 2001 - Rev. 3
ON Semiconductor
2000 South County Trail, East Greenwich, RI 02818
Tel: (401)885â3600 Fax: (401)885â5786
N. American Technical Support: 800-282-9855
Web Site: www.cherryâsemi.com
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