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CS3524A 데이터시트 PDF




Cherry Semiconductor Corporation에서 제조한 전자 부품 CS3524A은 전자 산업 및 응용 분야에서
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부품번호 CS3524A 기능
기능 Voltage Mode PWM Control Circuit with 200mA Output Drivers
제조업체 Cherry Semiconductor Corporation
로고 Cherry Semiconductor Corporation 로고


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CS3524A 데이터시트, 핀배열, 회로
CS3524A
Voltage Mode PWM Control Circuit
with 200mA Output Drivers
Description
Features
The CS3524A PWM control circuit
retains the same versatile architecture
of the industry standard CS3524
(SG3524) while adding substantial
improvements.
The CS3524 is pin-compatible with
“non-A” versions, and in most applica-
tions can be directly interchanged. The
CS3524A, however, eliminates many of
the design restrictions which had pre-
viously required additional external
circuitry.
The CS3524A includes a precision 5V
reference trimmed to ±1% accuracy
(eliminating the need for potentiometer
adjustments), an error amplifier with
an output voltage swing extending to
5V, and a current sense amplifier use-
ful in either the ground or power sup-
ply output lines. The uncommitted
60V, 200mA NPN output pair greatly
enhances the output drive capability.
The CS3524A features an undervoltage
lockout circuit which disables all inter-
nal circuitry (except the reference) until
the input voltage has risen to 8V. This
holds standby current low until turn-
on, and greatly simplifies the design of
low power, off-line supplies. The turn-
on circuit has approximately 600mV of
hysteresis for jitter free activation.
Other improvements include a PWM
latch that insures freedom from multi-
ple pulsing within a period, even in
noisy environments; logic to eliminate
double pulsing on a single output, a
200ns external shutdown capability,
and automatic thermal protection from
excessive chip temperature. The oscil-
lator circuit is usable to 500kHz and is
easier to synchronize with an external
clock pulse.
s Precision Reference
Internally Trimmed to ±1%
s Current Limit
s Undervoltage Lockout
s Start-up Supply Current
< 4mA
s Output to 200mA
s 60V Output Capability
s Wide Common-mode
Input Range for Error and
Current Limit Amplifiers
s PWM Latch Insures Single
Pulse per Period
s Double Pulse Suppression
s 200ns Shutdown
s Guaranteed Frequency
s Thermal Shutdown
Block Diagram
VIN
SYNC
RT
CT
COMP
EA-
EA+
ISENSE+
ISENSE-
OSC
UV
Sense
CLOCK
5V Reference
Regulator
Power to
Internal
Circuitry
T
Flip
Flop
RAMP
VIN
-
EA
+
200mV
VIN
+
COMP
-
R
S
PWM
S Latch
1k
10k
CL
VREF
V O UTA
EA
V O UTB
EB
SHUTDOWN
Gnd
Package Options
16 Lead PDIP & SO Wide
EA- 1
EA+ 2
SYNC 3
ISENSE+ 4
ISENSE- 5
RT 6
CT 7
Gnd 8
16 VREF
15 VIN
14 EB
13 VOUTB
12 VOUTA
11 EA
10 SHUTDOWN
9 COMP
Rev. 10/28/96
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




CS3524A pdf, 반도체, 판매, 대치품
Typical Performance Characteristics continued
Quiescent Supply Current vs. Supply Voltage Over
Temperature
10
Shutdown Delay From PWM Comparator
9
8 TA = -55°C
7 TA = 25°C
6 TA = 125°C
5
20
OUTPUT at
15 VOA or VOB
10
5
VIN = 20V
RL = 2k
0 TA = 25˚C
4
3
2
Note: Outputs off. RT =
1
0
0 10 20 30 40 50
SUPPLY VOLTAGE VIN (V)
5
4
3 INPUT at VOB
2
1
0 Note: Minimum input pulse width
to latch is 200ns
012 3
DELAY TIME (µs)
Oscillator Frequency vs. Timing Components Resistor
Over Timing Capacitance
1M
100k
10k
1k
VIN = 20V
TA = 25˚C
CT = 1.0nf
CT = 3.0nf
CT = 10nf
CT = 30nf
CT = 100nf
100
1
f
1.15
RTCT
2
5 10 20
50
TIMING RESISTOR - RT (k)
100
Output Dead Time vs. Timing Capacitor Value
10
5.0
VIN = 20V
RT = 2700
TA = 25˚C
2.0
1.0
0.5
0.2
0.1
1
Note: Dead time = osc output pulse
width plus output delay
2
5 10 20
50
TIMING CAPACITOR - CT (nf)
100
Current Limit Amplifier Delay
OUTPUT at COMP
6
5
Overdrive
4
5%
10%
3 20%
2 50%
1
0
INPUT at ISENSE+
0.2
0.1
VIN 20V TA 25˚C
EA+ = VREF
ISENSE– = Gnd
0.0
01 234
DELAY TIME (µs)
Turn-Off Delay From Shutdown
20
15 VIN = 20V
RL = 2k
10 TA = 25˚C
5 OUTPUT at
VOA OR VOB
0
1.0
0.5 INPUT at
SHUTDOWN
0.0
Note: Minimum input pulse width
to latch is 200ns
01 2 3
DELAY TIME (µs)
4

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