CS5661EDWR16 View Datasheet(PDF) - Cherry semiconductor
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Description
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CS5661EDWR16 Datasheet PDF : 8 Pages
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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 4.0kΩ and 16kΩ.
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
14
12
10
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
GAIN
60
0
VCC = 15V
VO = 1.5V TO 2.5V 30
RL = 100kΩ
TA = 25°C
60
40
PHASE 90
20
120
0
150
-20
10k
100k
1.0k 10k 100k
f, FREQUENCY (Hz)
1.0M
180
10M
4
50
48
46
44
42 VCC = 15V
RT = 4.0kΩ to 16kΩ
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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