Philips Semiconductors |
Product specification |
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SMPS control circuit |
SG3524 |
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DESCRIPTION
This monolithic integrated circuit contains all the control circuitry for a regulating power supply inverter or switching regulator. Included in a 16-pin dual-in-line package is the voltage reference, error amplifier, oscillator, pulse-width modulator, pulse steering flip-flop, dual alternating output switches and current-limiting and shut-down circuitry. This device can be used for switching regulators of either polarity, transformer-coupled DC-to-DC converters, transformerless voltage doublers and polarity converters, as well as other power control applications. The SG3524 is designed for commercial applications of 0°C to +70°C.
FEATURES
•Complete PWM power control circuitry
•Single ended or push-pull outputs
•Line and load regulation of 0.2%
•1% maximum temperature variation
•Total supply current is less than 10mA
•Operation beyond 100kHz
PIN CONFIGURATION
D, F, N Packages
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INVERT INPUT |
1 |
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16 |
VREF |
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NON-INV INPUT |
2 |
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15 |
VIN |
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OSC OUTPUT |
3 |
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14 |
EMITTER B |
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(+)CL SENSE |
4 |
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13 |
COLLECTOR B |
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(±)CL SENSE |
5 |
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12 |
COLLECTOR A |
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RT |
6 |
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11 |
EMITTER A |
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CT |
7 |
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10 |
SHUTDOWN |
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GROUND |
8 |
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9 |
COMPENSATION |
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TOP VIEW |
SL00174 |
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Figure 1. Pin Configuration
ORDERING INFORMATION
DESCRIPTION |
TEMPERATURE RANGE |
ORDER CODE |
DWG # |
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16-Pin Plastic Dual In-Line Package (DIP) |
0 to +70°C |
SG3524N |
SOT38-4 |
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16-Pin Ceramic Dual In-Line Package (CERDIP) |
0 to +70°C |
SG3524F |
0582B |
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16-Pin Small Outline (SO) Package |
0 to +70°C |
SG3524D |
SOT109-1 |
BLOCK DIAGRAM
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VREF 16 |
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VIN |
15 |
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REF |
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+5V TO ALL |
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REG |
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INTERNAL CIRCUITRY |
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+5V |
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12 |
CA |
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OSCILLATOR |
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+5V |
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3 OUTPUT |
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NOR |
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RT |
6 |
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FLIP FLOP |
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OSC |
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11 |
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CT |
7 |
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(RAMP) |
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+5V |
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13 |
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CB |
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+ |
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NOR |
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COMPARATOR |
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14 |
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± |
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EB |
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+5V |
+5V |
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ERROR |
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1 |
± |
+ |
4 |
+SENSE |
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INV INPUT |
AMP |
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2 |
+ |
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CL |
5 |
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N.I. INPUT |
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± |
±SENSE |
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1k |
9 |
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GROUND |
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COMPENSATION |
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8 |
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10 |
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(SUBSTRATE) |
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SHUTDOWN |
10k |
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SL00175 |
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Figure 2. Block Diagram |
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1994 Aug 31 |
1 |
853-0891 13721 |
Philips Semiconductors |
Product specification |
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SMPS control circuit |
SG3524 |
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ABSOLUTE MAXIMUM RATINGS
SYMBOL |
PARAMETER |
RATING |
UNIT |
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VIN |
Input voltage |
40 |
V |
IOUT |
Output current (each output) |
100 |
mA |
IREF |
Reference output current |
50 |
mA |
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Oscillator charging current |
5 |
mA |
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PD |
Power dissipation |
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Package limitation |
1000 |
mW |
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Derate above 25°C |
8 |
mW/°C |
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TA |
Operating temperature range |
0 to +70 |
°C |
TSTG |
Storage temperature range |
-65 to +150 |
°C |
DC ELECTRICAL CHARACTERISTICS
TA=0°C to +70°C, VIN=20V, and f=20kHz, unless otherwise specified.
SYMBOL |
PARAMETER |
TEST CONDITIONS |
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LIMITS |
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UNIT |
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Min |
Typ |
Max |
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Reference section |
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VOUT |
Output voltage |
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4.6 |
5.0 |
5.4 |
V |
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Line regulation |
VIN=8 to 40V |
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10 |
30 |
mV |
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Load regulation |
IL=0 to 20mA |
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20 |
50 |
mV |
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Ripple rejection |
f=120Hz, TA=25°C |
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66 |
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dB |
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ISC |
Short circuit current limit |
VREF=0, TA=25°C |
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100 |
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mA |
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Temperature stability |
Over operating temperature range |
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0.3 |
1 |
% |
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Long-term stability |
TA=25°C |
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20 |
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mV/kHz |
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Oscillator section |
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fMAX |
Maximum frequency |
CT=0.001 μF, RT=2kΩ |
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300 |
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kHz |
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Initial accuracy |
RT and CT constant |
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5 |
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% |
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Voltage stability |
VIN=8 to 40V, TA=25°C |
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1 |
% |
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Temperature stability |
Over operating temperature range |
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2 |
% |
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Output amplitude |
Pin 3, TA=25°C |
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3.5 |
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VP |
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Output pulse width |
CT=0.01 μF, TA=25°C |
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0.5 |
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μs |
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Error amplifier section |
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VOS |
Input offset voltage |
VCM=2.5V |
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2 |
10 |
mV |
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IBIAS |
Input bias current |
VCM=2.5V |
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2 |
10 |
μA |
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Open-loop voltage gain |
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68 |
80 |
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dB |
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VCM |
Common-mode voltage |
TA=25°C |
1.8 |
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3.4 |
V |
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CMRR |
Common-mode rejection ratio |
TA=25°C |
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70 |
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dB |
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BW |
Small-signal bandwidth |
AV=0dB, TA=25°C |
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3 |
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MHz |
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VOUT |
Output voltage |
TA=25°C |
0.5 |
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3.8 |
V |
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Comparator section |
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Duty cycle |
% each output ªONº |
0 |
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45 |
% |
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Input threshold |
Zero duty cycle |
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1 |
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V |
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Input threshold |
Maximum duty cycle |
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3.5 |
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V |
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IBIAS |
Input bias current |
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1 |
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μA |
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Current limiting section |
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Sense voltage |
Pin 9=2V with error amplifier set for maximum out, |
180 |
200 |
220 |
mV |
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TA=25°C |
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Sense voltage T.C. |
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0.2 |
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mV/°C |
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VCM |
Common-mode voltage |
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-1 |
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+1 |
V |
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1994 Aug 31 |
2 |
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