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CS5661 데이터시트 PDF




Cherry Semiconductor Corporation에서 제조한 전자 부품 CS5661은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


 

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부품번호 CS5661 기능
기능 High Performance Dual Channel Current Mode Controller with ENABLE
제조업체 Cherry Semiconductor Corporation
로고 Cherry Semiconductor Corporation 로고


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CS5661 데이터시트, 핀배열, 회로
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
Rev. 2/2/99
Cherry Semiconductor Corporation
2000 South County Trail, East Greenwich, RI 02818
Tel: (401)885-3600 Fax: (401)885-5786
Web Site: www.cherry-semi.com
1
A Company
®




CS5661 pdf, 반도체, 판매, 대치품
PACKAGE PIN #
16 Lead SO Wide
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Package Pin Description
PIN SYMBOL
FUNCTION
SYNC
CT
RT
VFB1
COMP1
SENSE1
VOUT1
Gnd
Pwr Gnd
VOUT2
SENSE2
COMP2
VFB2
ENABLE2
VREF
VCC
A positive going pulse applied to this input will synchronize the
oscillator. A DC voltage within the range of 2.4V to 5.5V will
inhibit the oscillator.
Timing capacitor CT connects pin to ground setting oscillator
frequency.
Resistor RT connects to ground setting the charge current for CT.
Its value must be between 4.0kand 16k.
The inverting input of error amplifier 1. Normally it is connect-
ed to the switching power supply output.
The output of error amplifier 1, for loop compensation.
Output 1 pulse by pulse current limit.
Drives the power switch at output 1.
Logic ground
Power ground. Power device return is connected to this pin.
Drives the power switch at output 2.
Output 2 pulse by pulse current limit.
Output of error amplifier 2, for loop compensation.
Inverting input of error amplifier 2. Normally it is connected to
the switching power supply output.
Output 2 disable. A logic low at this pin disables VOUT2.
5.0V reference output. It can source current in excess of 30mA.
The positive supply of the IC. The minimum operating voltage
after start-up is 8.8V.
Typical Performance Characteristics
Timing Resistor vs. Oscillator Frequency
Max. Output Duty Cycle vs. Oscillator Frequency
16 50
14 48
12 46
10 44
8.0
VCC=
6.0 15V
4.0 TA=25°C
10k 30k 50k
100k
300k 500k
f OSC OSCILLATOR FREQUENCY (Hz)
1.0M
Error Amp Open-Loop Gain & Phase vs. Frequency
100
80
60
40
20
0
-20
10k
GAIN
VCC = 15V
VO = 1.5V TO 2.5V
RL = 100k
TA = 25°C
0
30
60
PHASE 90
120
100k
1.0k 10k 100k
f, FREQUENCY (Hz)
1.0M
150
180
10M
4
42 VCC = 15V
RT = 4.0kto 16k
40 CL = 15pF
TA = 25°C
38
10k
30k 50k 100k
300k 500k 1.0M
f OSC OSCILLATOR FREQUENCY (Hz)
Current Sense Input Threshold
vs. Error Amp Output Voltage
1.2
VCC = 15V
1.0
0.8 TA = 125°C
TA = 25°C
0.6
0.4 TA = -55°C
0.2
0
0 1.0 2.0 3.0 4.0 5.0 6.0 7.0
ERROR AMP OUTPUT VOLTAGE (V)

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CS5661 전자부품, 판매, 대치품
Operating Description: continued
ter capacitor. Ceramic bypass capacitors (0.1µF) connected
directly to VCC and VREF may be required to improve noise
filtering. This provides a low impedance path for filtering
the high frequency noise. All high current loops should be
kept as short as possible using heavy copper runs. The
error amp compensation circuitry and the converter out-
put voltage-divider should be located close to the IC and
as far as possible from the power switch and other noise
generating components.
Timing Diagram
SYNC
Capacitor CT
Latch 1
“Set” Input
COMP1
Sense1
Latch 1
“Reset” Input
VOUT1
ENABLE2
0V
Latch 2
“Set” Input
COMP2
Sense2
Latch 2
“Reset” Input
VOUT2
Typical Application Diagram
Dual Boost Regulator
VCC
CF2
VREF
Sync
VOUT1
RFB1
RT CT
RFB2
VFB1
COMP1
VOUT2
ENABLE2
RFB3
RFB4
VFB2
COMP2
5.0V
2.5V
Reference
R
Internal
Bias
Regulator
+
R
+
3.4V-
- VREF
UVLO
20k
+
-
VCC +
UVLO -
8.4V
+ Oscillator
+
1mA
Current Sense
2R Comparator 1
+
-
Error
Amp 1
+ 1.0V
R-
250µA
PWM
Latch 1
S
RQ
+
-
Error
Amp 2
+
1mA
Current Sense
Comparator 2
2R
+
1.0V
R-
PWM
Latch 2
S
RQ
R
Gnd Pwr Gnd
VIN
CF1 +
L1
D1
VOUT1
Q1
RSense1
L2
D2
Sense1
VOUT2
Q2
VOUT1
+
COUT1
+ VOUT2
COUT2
Sense2
RSense2
7

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