©
Semiconductor Components Industries, LLC, 2001
December, 2000 Rev. 3
1
Publication Order Number:
CS3524A/D
CS3524A
Voltage Mode
PWM Control Circuit with
200 mA Output Drivers
The CS3524A PWM control circuit retains the same versatile
architecture of the industry standard CS3524 (SG3524) while adding
substantial improvements.
The CS3524 is pincompatible with "nonA" versions, and in most
applications can be directly interchanged. The CS3524A, however,
eliminates many of the design restrictions which had previously
required additional external circuitry.
The CS3524A includes a precision 5.0 V reference trimmed to
±
1%
accuracy (eliminating the need for potentiometer adjustments), an
error amplifier with an output voltage swing extending to 5.0 V, and a
current sense amplifier useful in either the ground or power supply
output lines. The uncommitted 60 V, 200 mA NPN output pair greatly
enhances the output drive capability.
The CS3524A features an undervoltage lockout circuit which
disables all internal circuitry (except the reference) until the input
voltage has risen to 8.0 V. This holds standby current low until
turnon, and greatly simplifies the design of low power, offline
supplies. The turnon circuit has approximately 600 mV of hysteresis
for jitter free activation.
Other improvements include a PWM latch that insures freedom
from multiple pulsing within a period, even in noisy environments;
logic to eliminate double pulsing on a single output, a 200 ns external
shutdown capability, and automatic thermal protection from excessive
chip temperature. The oscillator circuit is usable to 500 kHz and is
easier to synchronize with an external clock pulse.
Features
·
Precision Reference Internally Trimmed to
±
1%
·
Current Limit
·
Undervoltage Lockout
·
StartUp Supply Current < 4.0 mA
·
Output to 200 mA
·
60 V Output Capability
·
Wide CommonMode Input Range for Error and Current Limit
Amplifiers
·
PWM Latch Insures Single Pulse per Period
·
Double Pulse Suppression
·
200 ns Shutdown
·
Guaranteed Frequency
·
Thermal Shutdown
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A
= Assembly Location
WL, L
= Wafer Lot
YY, Y
= Year
WW, W
= Work Week
SO16L
DW SUFFIX
CASE 751G
1
16
Device
Package
Shipping
ORDERING INFORMATION
CS3524AGN16
DIP16
25 Units/Rail
CS3524AGDW16
SO16L
46 Units/Rail
CS3524AGDWR16
SO16L 1000 Tape & Reel
DIP16
N SUFFIX
CASE 648
1
16
MARKING
DIAGRAMS
16
1
CS3524A
AWLYYWW
PIN CONNECTIONS
V
OUTB
I
SENSE+
E
B
SYNC
V
IN
EA+
V
REF
EA
1
COMP
GND
SHUTDOWN
C
T
E
A
R
T
V
OUTA
I
SENSE
1
CS3524A
AWLYYWW
16
CS3524A
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2
Figure 1. Block Diagram
V
REF
V
OUTA
E
A
V
OUTB
E
B
SHUTDOWN
GND
V
IN
SYNC
R
T
C
T
COMP
EA
EA+
I
SENSE+
I
SENSE
OSC
5 V Reference
Regulator
UV
Sense
RAMP
CLOCK
COMP
+
+
EA
CL
PWM
Latch
Flip
Flop
Power to
Internal
Circuitry
T
R
S
S
V
IN
V
IN
200 mV
1 k
10 k
ABSOLUTE MAXIMUM RATINGS*
Rating
Value
Unit
Supply Voltage (V
IN
)
40
V
Collector Supply Voltage (V
CC
)
60
V
Output Current (Each Output)
200
mA
Reference Output Current
50
mA
Oscillator Charging Current
5.0
mA
Power Dissipation at T
A
= 25
°
C
1000
mW
Power Dissipation at T
J
= +25
°
C
Derate for Case Temperature above +25
°
C
2000
16
mW
mW/
°
C
Storage Temperature Range
65 to +150
°
C
Lead Temperature Soldering
Wave Solder (through hole styles only) Note 1.
Reflow (SMD styles only) Note 2.
260 peak
230 peak
°
C
°
C
1. 10 seconds max.
2. 60 seconds max above 183
°
C
*The maximum package power dissipation must be observed.
CS3524A
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3
ELECTRICAL CHARACTERISTICS
(0
°
C
T
A
+70
°
C, V
IN
= V
CC
= 20 V; unless otherwise specified.)
Characteristic
Test Conditions
Min
Typ
Max
Unit
TurnOn Characteristics
Input Voltage
Operating Range after TurnOn
8.0
40
V
TurnOn Threshold
5.5
7.5
8.5
V
TurnOn Current
V
IN
TurnOn 100 mV
2.5
4.0
mA
Operating Current
V
IN
= 8.0 to 40 V
5.0
10
mA
TurnOn Hysteresis (Note 3.)
0.6
V
Reference Section
Output Voltage
T
A
= 25
°
C
4.9
5.0
5.2
V
Line Regulation
V
IN
= 10 to 40 V
10
30
mV
Load Regulation
I
L
= 0 to 20 mA
20
50
mA
Temperature Stability (Note 3.)
Over Operating Range
20
50
mV
Short Circuit Current
V
REF
= 0, T
A
= 25
°
C
80
100
mA
Output Noise Voltage (Note 3.)
10 Hz
f
10 kHz, T
A
= 25
°
C
40
µ
V
RMS
Long Term Stability (Note 3.)
T
A
= 125
°
C, 1000 Hrs.
20
50
mV
Oscillator Section
R
T
= 2700
W
, C
T
= 0.01
m
F; unless otherwise specified
Initial Accuracy
T
A
= 25
°
C
39
43
47
kHz
Temperature Stability (Note 3.)
Over Operating Temperature Range
1.0
2.0
%
Minimum Frequency
R
T
= 150 k
, C
T
= 0.1
µ
F
120
Hz
Maximum Frequency
R
T
= 2.0 k
, C
T
= 470 pF
500
kHz
Output Amplitude (Note 3.)
T
A
= 25
°
C
3.5
V
Output Pulse Width (Note 3.)
T
A
= 25
°
C
0.5
µ
s
Ramp Peak
3.3
3.5
3.7
V
Ramp Valley
0.7
0.9
1.0
V
Error Amplifier Section
V
CM
= 2.5 V; unless otherwise specified
Input Offset Voltage
2.0
10
mV
Input Bias Current
1.0
10
µ
A
Input Offset Current
0.5
1.0
µ
A
Common Mode Rejection Ratio
V
CM
= 1.5 to 5.5 V
60
75
dB
Power Supply Rejection Ratio
V
IN
= 10 to 40 V
50
60
dB
Output Swing
Minimum Total Range
0.5
5.0
V
Open Loop Voltage Gain
V
OUT
= 1.0 to 4.0 V, R
L
10 M
60
80
dB
GainBandwidth (Note 3.)
T
A
= 25
°
C, A
V
= 0 dB
3.0
MHz
Current Limit Amplifier
V
SENSE
= V
O
; unless otherwise specified
Input Offset Voltage
T
A
= 25
°
C, EA Set for Max. Output
180
200
220
mV
Input Offset Voltage
Over Operating Temperature Range
170
230
mV
Input Bias Current
1.0
10
µ
A
Common Mode Rejection Ratio
V
SENSE
= 0 to 15 V
50
60
dB
Power Supply Rejection Ratio
V
IN
= 10 to 40 V
50
60
dB
3. These parameters are guaranteed by design but not 100% tested in production.
CS3524A
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4
ELECTRICAL CHARACTERISTICS (continued)
(0
°
C
T
A
+70
°
C, V
IN
= V
CC
= 20 V; unless otherwise specified.)
Characteristic
Unit
Max
Typ
Min
Test Conditions
Current Limit Amplifier (continued)
V
SENSE
= V
O
; unless otherwise specified
Output Swing
Minimum Total Range
0.5
5.0
V
Open Loop Voltage Gain
V
OUT
= 1.0 to 4.0 V, R
L
10 M
70
80
dB
Delay Time (Note 4.)
V
IN
= 300 mV
300
ns
Output Section (Each Output)
Collector Emitter Voltage
I
C
= 100
µ
A
60
80
V
Collector Leakage Current
V
CE
= 50 V
0.1
20
µ
A
Saturation
I
C
= 20 mA
I
C
= 200 mA
0.2
1.0
0.4
2.2
V
V
Emitter Output Voltage
I
E
= 50 mA
17
18
V
Rise Time (Note 4.)
T
A
= 25
°
C, R = 2.0 k
200
ns
Fall Time (Note 4.)
T
A
= 25
°
C, R = 2.0 k
100
ns
Comparator Delay (Note 4.)
T
A
= 25
°
C, V
COMP
to V
OUT
300
ns
Shutdown Delay (Note 4.)
T
A
= 25
°
C, V
SHUT
to V
OUT
200
ns
Shutdown Threshold
T
A
= 25
°
C, R
C
= 2.0 k
0.5
0.7
1.0
V
Thermal Shutdown (Note 4.)
165
°
C
4. These parameters are guaranteed by design but not 100% tested in production.
TYPICAL PERFORMANCE CHARACTERISTICS
Figure 2. Error Amplifier Voltage Gain vs.
Frequency Over RF
Figure 3. Duty Cycle vs. Input Voltage
100
1 k
10 k
100 k
1 M
Frequency (Hz)
80
60
40
20
0
Open V
oltage Gain (dB)
R
F
=
R
F
= 1 M
R
F
= 300 k
R
F
= 100 k
R
F
= 30 k
V
IN
= 20 V
T
A
= 25
°
C
R
F
is impedance to ground.
Values below 30 k
will
begin to limit the maximum
dutycycle.
0
1
2
3
5
Input Voltage V
IN
50
40
30
0
DutyCycle (One
Output)
%
10
20
4
V
IN
= 20 V
R
T
= 2700
T
A
= 25
°
C
C
T
= 10
µ
F
C
T
= 1
µ
F
CS3524A
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5
Figure 4. Quiescent Supply Current vs. Supply
Voltage Over Temperature
Figure 5. Shutdown Delay from PWM Comparator
10
20
30
40
50
Supply Voltage V
IN
(V)
9
7
5
3
1
Quiescent Current (mA)
10
8
6
4
2
0
0
T
A
= 55
°
C
T
A
= 25
°
C
T
A
= 125
°
C
Note: Outputs off. R
T
=
0
1
2
3
Delay Time (
µ
s)
20
Input (V)
15
10
5
0
5
4
3
2
1
0
Output (V)
V
IN
= 20 V
R
L
= 2 k
T
A
= 25
°
C
Note: Minimum input pulse width to latch is 200 ns.
Output at
V
OA
or V
OB
Input at V
OB
Figure 6. Oscillator Frequency vs. Timing
Components Resistor Over Timing Capacitance
1 M
100 k
10 k
100
Oscillator Frequency (Hz)
1 k
1
2
5
20
100
Timing Resistor, R
T
(k
)
50
10
V
IN
= 20 V
T
A
= 25
°
C
f
[
1.15
RTCT
1. C
T
= 1.0 nF
2. C
T
= 3.0 nF
3. C
T
= 10 nF
4. C
T
= 30 nF
5. C
T
= 100 nF
1
2
3
4
5
1
2
5
20
100
Timing Capacitor, C
T
(nF)
50
10
10
5.0
0.1
Output Dead T
ime (
µ
s)
2.0
1.0
0.5
0.2
V
IN
= 20 V
R
T
= 2700
T
A
= 25
°
C
Note: Dead time = osc output
pulse width plus output delay
Figure 7. Output Dead Time vs. Timing Capacitor
Value
1
2
4
Delay Time (
µ
s)
Input (V)
Output (V)
5
6
4
3
2
1
0
0.2
0.1
0
3
0
Output at COMP
Overdrive
5%
10%
20%
50%
Input at I
SENSE+
V
IN
= 20 V, T
A
= 25
°
C
EA+ = V
REF
I
SENSE
= GND
0
1
2
3
Delay Time (
µ
s)
Note: Minimum input pulse
width to latch is 200 ns.
Input (V)
Output (V)
5
10
0
1.0
0.5
0
15
20
V
IN
= 20 V
R
L
= 2.0 k
T
A
= 25
°
C
Output at
V
OA
or V
OB
Input at
Shutdown
Figure 8. Current Limit Amplifier Delay
Figure 9. TurnOff Delay from Shutdown
CS3524A
http://onsemi.com
6
0
50
100
150
Output Collector Current (mA)
V
CE
Sat (V)
5
3
2
1
0
4
200
250
T
A
= 125
°
C
T
A
= 25
°
C
T
A
= 55
°
C
Figure 10. Output Saturation Voltage vs. Output
Current Over Temperature
Figure 11. Open Loop Test Circuit
V
REF
V
OUTA
E
A
V
OUTB
E
B
SHUTDOWN
GND
V
IN
SYNC
R
T
C
T
COMP
EA
EA+
I
SENSE+
I
SENSE
CS3524A
V
CC
2 k
1 W
2 k
1 W
2 k
SHUTDOWN
R
T
C
T
0.1
I
S
100 k
100 k
10 k
1 k
2 k
0.1
10 k
Note: The CS3524A should be able to be tested in any
3524 test circuit with two possible exceptions:
1. The higher gainbandwidth of the current limit
amplifier in the CS3524A may cause oscillations in
an uncompensated 3524 test circuit.
2. The effect of the shutdown cannot be seen at the
compensation terminal, but must be observed at the
outputs.
CS3524A
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7
PACKAGE DIMENSIONS
DIP16
N SUFFIX
CASE 64808
ISSUE R
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: INCH.
3. DIMENSION L TO CENTER OF LEADS WHEN
FORMED PARALLEL.
4. DIMENSION B DOES NOT INCLUDE MOLD FLASH.
5. ROUNDED CORNERS OPTIONAL.
A
B
F
C
S
H
G
D
J
L
M
16 PL
SEATING
1
8
9
16
K
PLANE
T
M
A
M
0.25 (0.010)
T
DIM
MIN
MAX
MIN
MAX
MILLIMETERS
INCHES
A
0.740
0.770
18.80
19.55
B
0.250
0.270
6.35
6.85
C
0.145
0.175
3.69
4.44
D
0.015
0.021
0.39
0.53
F
0.040
0.70
1.02
1.77
G
0.100 BSC
2.54 BSC
H
0.050 BSC
1.27 BSC
J
0.008
0.015
0.21
0.38
K
0.110
0.130
2.80
3.30
L
0.295
0.305
7.50
7.74
M
0
10
0
10
S
0.020
0.040
0.51
1.01
_
_
_
_
SO16L
DW SUFFIX
CASE 751G03
ISSUE B
D
14X
B
16X
SEATING
PLANE
S
A
M
0.25
B
S
T
16
9
8
1
h
X 45
_
M
B
M
0.25
H
8X
E
B
A
e
T
A1
A
L
C
q
NOTES:
1. DIMENSIONS ARE IN MILLIMETERS.
2. INTERPRET DIMENSIONS AND TOLERANCES
PER ASME Y14.5M, 1994.
3. DIMENSIONS D AND E DO NOT INLCUDE MOLD
PROTRUSION.
4. MAXIMUM MOLD PROTRUSION 0.15 PER SIDE.
5. DIMENSION B DOES NOT INCLUDE DAMBAR
PROTRUSION. ALLOWABLE DAMBAR
PROTRUSION SHALL BE 0.13 TOTAL IN EXCESS
OF THE B DIMENSION AT MAXIMUM MATERIAL
CONDITION.
DIM
MIN
MAX
MILLIMETERS
A
2.35
2.65
A1
0.10
0.25
B
0.35
0.49
C
0.23
0.32
D
10.15
10.45
E
7.40
7.60
e
1.27 BSC
H
10.05
10.55
h
0.25
0.75
L
0.50
0.90
q
0
7
_
_
PACKAGE THERMAL DATA
Parameter
DIP16
SO16L
Unit
R
JC
Typical
42
23
°
C/W
R
JA
Typical
80
105
°
C/W
CS3524A
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8
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without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular
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including without limitation special, consequential or incidental damages. "Typical" parameters which may be provided in SCILLC data sheets and/or
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CS3524A/D
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