Output Current (Each Output)...........................................................................................................................................200mA
Oscillator Charging Current ..................................................................................................................................................5mA
Derate for Case Temperature above +25˚C........................................................................................................16mW/˚C
Storage Temperature Range ................................................................................................................................-65˚C to +150˚C
Lead Temperature Soldering: Wave Solder (through hole styles only)..........................................10 sec. max, 260°C peak
Reflow (SMD styles only) ......................................................................................60 sec. max above 183°C, 230°C peak
Electrical Characteristics:
0˚C
≤
T
A
≤
+70˚C for the CS3524A; V
IN
= V
CC
= 20V; unless otherwise stated.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
s
Turn-on Characteristics
Input Voltage
Turn-on Threshold
Turn-on Current
Operating Current
Turn-on Hysteresis*
s
Reference Section
Output Voltage
Line Regulation
Load Regulation
Temperature Stability*
Short Circuit Current
Output Noise Voltage*
Long Term Stability*
T
A
= 25˚C
V
IN
= 10 to 40V
I
L
= 0 to 20mA
Over Operating Range
V
REF
= 0, T
A
= 25˚C
10Hz
≤
f
≤
10kHz, T
A
= 25˚C
T
A
= 125˚C; 1000 Hrs.
4.90
5.00
10
20
20
80
40
20
50
5.20
30
50
50
100
V
mV
mA
mV
mA
µVrms
mV
V
IN
Turn-on - 100mV
V
IN
= 8 to 40V
Operating range after Turn-on
8
5.5
7.5
2.5
5
0.6
40
8.5
4.0
10
V
V
mA
mA
V
s
Oscillator Section (Unless otherwise specified, R
T
= 2700Ω, C
T
= 0.01µF)
Initial Accuracy
Temperature Stability*
Minimum Frequency
Maximum Frequency
Output Amplitude*
Output Pulse Width*
Ramp Peak
Ramp Valley
s
Error Amplifier Section (Unless otherwise specified, V
CM
= 2.5V)
Input Offset Voltage
Input Bias Current
Input Offset Current
Common Mode
Rejection Ratio
Output Swing
V
CM
= 1.5 to 5.5V
Minimum Total Range
2
60
50
0.5
2
1
0.5
75
60
5.0
10
10
1.0
mV
µA
µA
dB
dB
V
T
A
= 25˚C
Over Operating Temperature Range
R
T
= 150kΩ, C
T
= 0.1µF
R
T
= 2.0kΩ, C
T
= 470pF
T
A
= 25˚C
T
A
= 25˚C
3.3
0.7
500
3.5
0.5
3.5
0.9
3.7
1.0
39
43
1
47
2
120
kHz
%
Hz
kHz
V
µs
V
V
Power Supply Rejection Ratio V
IN
= 10 to 40V
* These parameters are guaranteed by design but not 100% tested in production.
CS3524A
Electrical Characteristics:
continued
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
s
Error Amplifier Section (Unless otherwise specified, V
CM
= 2.5V): continued
Open Loop Voltage Gain
Gain-Bandwidth*
∆
VOUT
= 1 to 4V, R
L
≥
10 MΩ
T
A
= 25˚C, A
V
= 0dB
60
80
3
dB
MHz
s
Current Limit Amplifier (Unless otherwise specified, V
SENSE
= V
O
)
Input Offset Voltage
Input Offset Voltage
Input Bias Current
Common Mode
Rejection Ratio
Output Swing
Open Loop Voltage Gain
Delay Time*
s
Output Section (Each Output)
Collector Emitter Voltage
Collector Leakage Current
Saturation
Emitter Output Voltage
Rise Time*
Fall Time*
Comparator Delay*
Shutdown Delay*
Shutdown Threshold
Thermal Shutdown*
* These parameters are guaranteed by design but not 100% tested in production.
Typical Performance Characteristics
Error Amplifier Voltage Gain vs. Frequency Over RF
50
80
T
A
= 25˚C, EA Set for Max. Output
Over Operating Temperature Range
180
170
200
-1
220
230
-10
mV
mV
µA
dB
dB
V
SENSE
= 0 to 15V
Minimum Total Range
∆
VOUT
= 1 to 4V, R
L
≥
10MΩ
∆V
IN
= 300mV
50
50
0.5
70
60
60
5.0
80
300
Power Supply Rejection Ratio V
IN
= 10 to 40V
V
dB
ns
I
C
= 100µA
V
CE
= 50V
I
C
= 20mA
I
C
= 200mA
I
E
= 50mA
T
A
= 25˚C, R = 2kΩ
T
A
= 25˚C, R = 2kΩ
T
A
= 25˚C, V
COMP
to V
OUT
T
A
= 25˚C, V
SHUT
to V
OUT
T
A
= 25˚C, R
C
= 2kΩ
60
80
0.1
0.2
1.0
20.0
0.4
2.2
V
µA
V
V
V
ns
ns
ns
ns
1.0
V
˚C
17
18
200
100
300
200
0.5
0.7
165
Duty Cycle vs. Input Voltage
OPEN VOLTAGE GAIN (dB)
R
F
= 1MΩ
60
R
F
= 300kΩ
R
F
= 100kΩ
40
R
F
= 30kΩ
V
IN
= 20V
T
A
= 25˚C
DUTY-CYCLE (ONE OUTPUT) - %
R
F
=
∞
40
V
IN
= 20V
R
T
= 2700Ω
T
A
= 25˚C
F
=1
0
µ
CT
20
Note: Duty-Cycle is
percent of two
clock periods that
one output conducts
0
1
2
3
4
5
20
0
R
F
is impedance to ground.
Values below 30kΩ will begin
to limit the maximum
duty-cycle.
10
0
100
1k
10k
100k
1M
FREQUENCY (Hz)
INPUT VOLTAGE V
IN
3
CT
=
1
µ
F
30
CS3524A
Typical Performance Characteristics continued
Quiescent Supply Current vs. Supply Voltage Over
Temperature
10
Shutdown Delay From PWM Comparator
OUTPUT (V)
QUIESCENT CURRENT (mA)
9
8
7
6
5
T
A
= -55°C
T
A
= 25°C
T
A
= 125°C
20
15
10
5
0
5
4
3
2
1
0
0
V
IN
= 20V
R
L
= 2kΩ
T
A
= 25˚C
OUTPUT at
V
OA
or V
OB
3
2
Note: Outputs off. R
T
=
∞
1
0
0
10
20
30
40
50
INTPUT (V)
4
INPUT at V
OB
Note: Minimum input pulse width
to latch is 200ns
1
2
3
SUPPLY VOLTAGE V
IN
(V)
DELAY TIME (µs)
Oscillator Frequency vs. Timing Components Resistor
Over Timing Capacitance
1M
Output Dead Time vs. Timing Capacitor Value
10
OSCILLATOR FREQUENCY (Hz)
OUTPUT DEAD TIME (µs)
V
IN
= 20V
T
A
= 25˚C
100k
5.0
V
IN
= 20V
R
T
= 2700Ω
T
A
= 25˚C
2.0
1.0
0.5
C
T
C
T
=1
.0n
=3
.0n
=1
0nf
=3
0nf
f
f
10k
C
T
C
T
1k
f≈ 1.15
R
T
C
T
100
1
2
5
10
C
T
=1
00n
f
0.2
0.1
Note: Dead time = osc output pulse
width plus output delay
1
2
5
10
20
50
100
20
50
100
TIMING RESISTOR - R
T
(kΩ)
TIMING CAPACITOR - C
T
(nf)
Current Limit Amplifier Delay
OUTPUT at COMP
Turn-Off Delay From Shutdown
OUTPUT (V)
20
15
10
5
0
OUTPUT at
V
O
A
OR V
O
B
V
IN
= 20V
R
L
= 2kΩ
T
A
= 25˚C
6
5
4
3
2
1
0
OUTPUT (V)
Overdrive
5%
10%
20%
50%
INTPUT (V)
INPUT at I
SENSE+
0.2
0.1
0.0
0
1
2
V
IN
20V T
A
25˚C
EA+ = V
REF
I
SENSE–
= Gnd
INTPUT (V)
1.0
0.5
0.0
Note: Minimum input pulse width
to latch is 200ns
0
1
2
3
INPUT at
SHUTDOWN
3
4
DELAY TIME (µs)
DELAY TIME (µs)
4
CS3524A
Typical Performance Characteristics continued
Output Saturation Voltage vs. Output Current Over
Temperature
5
4
V
CE
SAT (V)
3
T
A
= 125˚C
2
T
A
= 25˚C
1
T
A
= –55˚C
0
0
50
100
150
200
250
OUTPUT COLLECTOR CURRENT (mA)
Open Loop Test Circuit
V
CC
I
S
V
IN
V
OUTA
V
OUTB
SYNC
2kΩ
1W
2kΩ
1W
SHUTDOWN
CS3524A
I
SENSE
+
I
SENSE
-
COMP
EA+
EA–
E
A
100kΩ 100kΩ
SHUTDOWN
2kΩ
0.1
R
T
C
T
2kΩ
10kΩ
0.1
10kΩ
1kΩ
Note:
The CS3524A should be able to be tested in any 3524 test circuit with two possible exceptions:
1. The higher gain-bandwidth of the current limit amplifier in the CS 3524A may cause oscillations in an uncom-
pensated 3524 test circuit.
2. The effect of the shutdown, cannot be seen at the compensation terminal, but must be
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