SG2524, SG3524
REGULATING PULSE WIDTH MODULATORS
SLVS077D APRIL 1977 REVISED FEBRUARY 2003
1
POST OFFICE BOX 655303
·
DALLAS, TEXAS 75265
D
Complete Pulse-Width Modulation (PWM)
Power-Control Circuitry
D
Uncommitted Outputs for Single-Ended or
Push-Pull Applications
D
Low Standby Current . . . 8 mA Typ
D
Interchangeable With Industry Standard
SG2524 and SG3524
description/ordering information
The SG2524 and SG3524 incorporate all the
functions required in the construction of a
regulating power supply, inverter, or switching
regulator on a single chip. They also can be used
as the control element for high-power-output
applications. The SG2524 and SG3524 were
designed for switching regulators of either polarity, transformer-coupled dc-to-dc converters, transformerless
voltage doublers, and polarity-converter applications employing fixed-frequency, pulse-width modulation
(PWM) techniques. The complementary output allows either single-ended or push-pull application. Each device
includes an on-chip regulator, error amplifier, programmable oscillator, pulse-steering flip-flop, two uncommitted
pass transistors, a high-gain comparator, and current-limiting and shutdown circuitry.
ORDERING INFORMATION
T
INPUT
REGULATION
PACKAGE
ORDERABLE
TOP-SIDE
TA
REGULATION
MAX (mV)
PACKAGE
ORDERABLE
PART NUMBER
TOP-SIDE
MARKING
PDIP (N)
Tube of 25
SG3524N
SG3524N
0
°
C to 70
°
C
30
SOIC (D)
Tube of 40
SG3524D
SG3524
0
°
C to 70
°
C
30
SOIC (D)
Reel of 2500
SG3524DR
SG3524
SOP (NS)
Reel of 2000
SG3524NSR
SG3524
PDIP (N)
Tube of 25
SG2524N
SG2524N
25
°
C to 85
°
C
20
SOIC (D)
Tube of 40
SG2524D
SG2524
SOIC (D)
Reel of 2500
SG2524DR
SG2524
Package drawings, standard packing quantities, thermal data, symboliztion, and PCB design guidelines are
available at www.ti.com/sc/package.
Copyright
2003, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
IN
IN+
OSC OUT
CURR LIM+
CURR LIM
RT
CT
GND
REF OUT
V
CC
EMIT 2
COL 2
COL 1
EMIT 1
SHUTDOWN
COMP
SG2524 . . . D OR N PACKAGE
SG3524 . . . D, N, OR NS PACKAGE
(TOP VIEW)
SG2524, SG3524
REGULATING PULSE WIDTH MODULATORS
SLVS077D APRIL 1977 REVISED FEBRUARY 2003
2
POST OFFICE BOX 655303
·
DALLAS, TEXAS 75265
functional block diagram
T
COL 2
OSC OUT
EMIT 2
EMIT 1
COL 1
Vref
Reference
Regulator
Comparator
Oscillator
SHUTDOWN
Error Amplifier
1
2
9
4
5
CURR LIM
CURR LIM+
GND
8
10
+
+
NOTE A: Resistor values shown are nominal.
12
11
13
14
3
IN
IN+
COMP
1 k
10 k
15
RT
CT
REF OUT
16
6
7
Vref
Vref
Vref
Vref
VCC
Vref
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage, V
CC
(see Notes 1 and 2)
40 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Collector output current, I
CC
100
mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Reference output current, I
O(ref)
50
mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Current through CT terminal
5 mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating virtual junction temperature, T
J
150
°
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Package thermal impedance,
JA
(see Notes 3 and 4): D package
73
°
C/W
. . . . . . . . . . . . . . . . . . . . . . . . . . .
N package
67
°
C/W
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
NS package
64
°
C/W
. . . . . . . . . . . . . . . . . . . . . . . . . . .
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds
260
°
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range, T
stg
65
°
C to 150
°
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTES:
1. All voltage values are with respect to network ground terminal.
2. The reference regulator may be bypassed for operation from a fixed 5-V supply by connecting the VCC and reference output
(REF OUT) pin both to the supply voltage. In this configuration, the maximum supply voltage is 6 V.
3. Maximum power dissipation is a function of TJ(max)
,
JA
,
and TA. The maximum allowable power dissipation at any allowable ambient
temperature is PD = (TJ(max) TA)/
JA. Operation at the absolute maximum TJ of 150
°
C can impact reliability.
4. The package thermal impedance is calculated in accordance with JESD 51-7.
SG2524, SG3524
REGULATING PULSE WIDTH MODULATORS
SLVS077D APRIL 1977 REVISED FEBRUARY 2003
3
POST OFFICE BOX 655303
·
DALLAS, TEXAS 75265
recommended operating conditions
MIN
MAX
UNIT
VCC
Supply voltage
8
40
V
Reference output current
0
50
mA
Current through CT terminal
0.03
2
mA
RT
Timing resistor
1.8
100
k
CT
Timing capacitor
0.001
0.1
µ
F
TA
Operating free air temperature
SG2524
25
85
°
C
TA
Operating free-air temperature
SG3524
0
70
°
C
electrical characteristics over recommended operating free-air temperature range, V
CC
= 20 V,
f = 20 kHz (unless otherwise noted)
reference section
PARAMETER
TEST CONDITIONS
SG2524
SG3524
UNIT
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNIT
Output voltage
4.8
5
5.2
4.6
5
5.4
V
Input regulation
VCC = 8 V to 40 V
10
20
10
30
mV
Ripple rejection
f = 120 Hz
66
66
dB
Output regulation
IO = 0 mA to 20 mA
20
50
20
50
mV
Output voltage change with temperature
TA = MIN to MAX
0.3%
1%
0.3%
1%
Short-circuit output current§
Vref = 0
100
100
mA
For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
All typical values, except for temperature coefficients, are at TA = 25
°
C
§ Standard deviation is a measure of the statistical distribution about the mean, as derived from the formula:
s +
N
n
+
1
(x
n
*
X)
2
N
*
1
oscillator section
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
fosc
Oscillator frequency
CT = 0.001
µ
F,
RT = 2 k
450
kHz
Standard deviation of frequency§
All values of voltage, temperature, resistance,
and capacitance constant
5%
f
Frequency change with voltage
VCC = 8 V to 40 V,
TA = 25
°
C
1%
fosc
Frequency change with temperature
TA = MIN to MAX
2%
Output amplitude at OSC OUT
TA = 25
°
C
3.5
V
tw
Output pulse duration (width) at OSC OUT
CT = 0.01
µ
F,
TA = 25
°
C
0.5
µ
s
For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
All typical values, except for temperature coefficients, are at TA = 25
°
C
§ Standard deviation is a measure of the statistical distribution about the mean, as derived from the formula:
s +
N
n
+
1
(x
n
*
X)
2
N
*
1
SG2524, SG3524
REGULATING PULSE WIDTH MODULATORS
SLVS077D APRIL 1977 REVISED FEBRUARY 2003
4
POST OFFICE BOX 655303
·
DALLAS, TEXAS 75265
error amplifier section
PARAMETER
TEST
SG2524
SG3524
UNIT
PARAMETER
TEST
CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNIT
VIO
Input offset voltage
VIC = 2.5 V
0.5
5
2
10
mV
IIB
Input bias current
VIC = 2.5 V
2
10
2
10
µ
A
Open-loop voltage amplification
72
80
60
80
dB
VICR
Common-mode input voltage range
TA = 25
°
C
1.8 to
3.4
1.8 to
3.4
V
CMMR
Common-mode rejection ratio
70
70
dB
B1
Unity-gain bandwidth
3
3
MHz
Output swing
TA = 25
°
C
0.5
3.8
0.5
3.8
V
For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
All typical values, except for temperature coefficients, are at TA = 25
°
C
output section
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
V(BR)CE
Collector-emitter breakdown voltage
40
V
Collector off-state current
VCE = 40 V
0.01
50
µ
A
Vsat
Collector-emitter saturation voltage
IC = 50 mA
1
2
V
VO
Emitter output voltage
VC = 20 V,
IE = 250
µ
A
17
18
V
tr
Turn-off voltage rise time
RC = 2 k
0.2
µ
s
tf
Turn-on voltage fall time
RC = 2 k
0.1
µ
s
For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
All typical values, except for temperature coefficients, are at TA = 25
°
C.
comparator section
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Maximum duty cycle, each output
45%
V
Inp t threshold oltage at COMP
Zero duty cycle
1
V
VIT
Input threshold voltage at COMP
Maximum duty cycle
3.5
V
IIB
Input bias current
1
µ
A
For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
All typical values, except for temperature coefficients, are at TA = 25
°
C.
current limiting section
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
VI
Input voltage range (either input)
1 to1
V
V(SENSE)
Sense voltage at TA = 25
°
C
V(IN ) V(IN )
50 mV V(COMP) 2 V
175
200
225
mV
Temperature coefficient of sense voltage
V(IN+) V(IN)
50 mV, V(COMP) = 2 V
0.2
mV/
°
C
All typical values, except for temperature coefficients, are at TA = 25
°
C.
total device
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Ist
Standby current
VCC = 40 V, IN, CURR LIM+, CT, GND, COMP, EMIT 1, EMIT 2 grounded,
IN+ at 2 V, All other inputs and outputs open
8
10
mA
All typical values, except for temperature coefficients, are at TA = 25
°
C.
SG2524, SG3524
REGULATING PULSE WIDTH MODULATORS
SLVS077D APRIL 1977 REVISED FEBRUARY 2003
5
POST OFFICE BOX 655303
·
DALLAS, TEXAS 75265
PARAMETER MEASUREMENT INFORMATION
0.1
µ
F
2 k
10 k
RT
1 W
2 k
8
4
2
1
9
6
7
10
11
14
16
3
12
13
(Open)
Outputs
VCC = 8 V to 40 V
15
SHUTDOWN
CT
RT
COMP
IN
IN+
CURR LIM+
COL 2
COL 1
OSC OUT
REF OUT
EMIT 2
EMIT 1
GND
SG2524 or SG3524
VCC
CT
2 k
1 W
2 k
2 k
10 k
1 k
5
CURR LIM
VREF
VREF
Figure 1. General Test Circuit
0 V
VCC
VOLTAGE WAVEFORMS
90%
10%
10%
90%
tr
tf
TEST CIRCUIT
Circuit Under Test
Output
2 k
VCC
Output
Figure 2. Switching Times
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