CS3865CGN16 ON Semiconductor, CS3865CGN16 Datasheet

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CS3865CGN16

Manufacturer Part Number
CS3865CGN16
Description
Manufacturer
ON Semiconductor
Datasheet
December, 2001 - Rev. 3
ENABLE
COMP
COMP
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
SYNC
V
V
V
REF
FB 1
FB 2
R
C
T
T
1
2
2
Current Mode Controller with ENABLE
+
+
-
-
High Performance Dual Channel
Error
Amp 1
Amp 2
Error
Oscillator
Description
Undervoltage
Block Diagram
Lockout
V
REF
Gnd
5.0V Ref
for driving power MOSFETs. One
of the outputs V
via the ENABLE
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.
CS3865C
Pwr Gnd
Latching
Latching
PWM 1
PWM 2
Undervoltage
Lockout
V
CC
OUT 2
2
pin.
1
is switchable
V
CC
V
Sense
V
Sense
OUT
OUT 2
1
1
2
2000 South County Trail, East Greenwich, RI 02818
N. American Technical Support: 800-282-9855
COMP
Tel: (401)885–3600 Fax: (401)885–5786
Sense
V
SYNC
OUT 1
V
Web Site: www.cherry–semi.com
Gnd
FB 1
C
R
Oscillator has Precise
Duty Cycle
Limit and Frequency
Control
500kHz Current Mode
Operation
Automatic Feed Forward
Compensation
Separate Latching PWMs
for Cycle-By-Cycle
Current Limiting
Internally Trimmed
Reference with
Undervoltage Lockout
Switchable Second
Output
Two High Current Totem
Pole Outputs
Input Undervoltage
Lockout with Hysteresis
Low Start-Up and
Operating Current
Package Options
T
T
1
1
16L PDIP & SO Wide
1
2
3
4
5
6
7
8
ON Semiconductor
Features
16
15
14
13
12
10
11
9
V
V
ENABLE
V
COMP
Sense
V
Pwr Gnd
CC
REF
FB 2
OUT 2
2
2
2

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CS3865CGN16 Summary of contents

Page 1

... COMP COMP Sense Sense OUT 1 OUT 2 Gnd Pwr Gnd Semiconductor 2000 South County Trail, East Greenwich, RI 02818 Tel: (401)885–3600 Fax: (401)885–5786 N. American Technical Support: 800-282-9855 Web Site: www.cherry–semi.com ...

Page 2

Total Power Supply and Zener Current .........................................................................................................................50mA Output Current, Source or Sink (Note 1)...........................................................................................................................1.0A Output Energy (capacitive load per cycle) .......................................................................................................................5.0µJ Current Sense, Enable and Voltage ......................................................................................................................-0.3 to +5.5V Feedback Inputs High State (Voltage)..........................................................................................................................................5.5V Low State (Reverse Current) ......................................................................................................................-5.0mA Error ...

Page 3

Electrical Characteristics 15V PARAMETER Current Sense Section Current Sense Input (Notes 4 and 5) Voltage Gain Maximum Current Sense (Note 4) Input Threshold Input Bias Current Propagation Delay Current Sense Input to Output (Note 6) Output ...

Page 4

PACKAGE PIN # PIN SYMBOL 16 L PDIP & SO Wide 1 SYNC COMP 6 Sense 7 V OUT 1 8 Gnd 9 Pwr Gnd 10 V OUT 2 ...

Page 5

Reference Voltage Change vs. Source Current 0 -4.0 -8.0 -12 - 125 C A -20 - REFERENCE SOURCE CURRENT (mA) ref Output Saturation Voltage vs. Load Current 0 SOURCE SATURATION V (LOAD ...

Page 6

The error amp is compensated externally thru the V COMP pins. Its output voltage is offset by two diode drops ( 1.4V) and divided by three before it connects to the inverting input of the current sense comparator. This guarantees ...

Page 7

Design Considerations High frequency circuit layout techniques are imperative to prevent pulse-width jitter. This is usually caused by exces- sive noise pick-up imposed on the current sense and volt- age feed-back inputs. Noise immunity can be improved by lowering circuit ...

Page 8

... REF: JEDEC MS-013 8.26 (.325) 7.62 (.300) 3.68 (.145) 2.92 (.115) .356 (.014) .203 (.008) REF: JEDEC MS-001 Ordering Information Part Number Description CS3865CGN16 16L PDIP CS3865CGDW16 16L SO Wide CS3865CGDWR16 16L SO Wide (tape & reel) Package Specification D Thermal Data English R Min Max Min ...

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