CS5651 Datasheet, PDF (1/8 Pages) Cherry Semiconductor Corporation – High Performance Dual Channel Current Mode Controller with ENABLE

CS5651
High Performance Dual Channel
Current Mode Controller with ENABLE
Description
Features
The CS5651 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.
One of the outputs, V_OUT2 is switch-
able 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 CS5651 is pin compatible with
the MC34065H.
Block Diagram
V_CC
V_REF
5.0V Ref
V_REF
Undervoltage
Lockout
V_CC
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
SYNC
C_T
R_T
V_FB1
COMP₁
ENABLE₂
V_FB2
COMP₂
Oscillator
+
-
Error
Amp 1
+
-
Error
Amp 2
Gnd
Latching
PWM 1
Latching
PWM 2
Pwr Gnd
V_OUT1
Sense₁
V_OUT2
Sense₂
Package Options
16L PDIP & SO Wide
SYNC 1
C_T 2
R_T 3
V_FB1 4
COMP₁ 5
SENSE₁ 6
V_OUT1 7
Gnd 8
16 V_CC
15 V_REF
14 ENABLE₂
13 V_FB2
12 COMP2
11 Sense₂
10 V_OUT2
9 Pwr Gnd
Rev. 3/9/99
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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