CS3865C Datasheet, PDF (1/8 Pages) Cherry Semiconductor Corporation – High Performance Dual Channel Current Mode Controller with ENABLE

CS3865C
High Performance Dual Channel
Current Mode Controller with ENABLE
Description
Features
The CS3865C is a high perfor-
mance, fixed frequency, dual cur-
rent mode controller. It is used in
Off-Line and DC to DC converter
applications and require a mini-
mum number of external compo-
nents. This integrated circuit fea-
tures a unique oscillator for precise
duty cycle limit and frequency con-
trol, 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 switchable
via the ENABLE ₂ 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 CS3865C has a 14V start volt-
age and is pin compatible with the
MC34065H.
V_REF
Block Diagram
5.0V Ref
V_REF
Undervoltage
Lockout
V_CC
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
s Low Start-Up and
Operating Current
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
Rev. 12/16/96
1
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
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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