SG3524 Datasheet, PDF (1/5 Pages) NXP Semiconductors – SMPS control circuit

Philips Semiconductors
SMPS control circuit
Product specification
SG3524
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
INVERT INPUT ¹
NON-INV INPUT ²
OSC OUTPUT ³
(+)CL SENSE ⁴
(–)CL SENSE ⁵
R_T ⁶
C_T ⁷
GROUND ⁸
16 V_REF
15 V_IN
14 EMITTER B
13 COLLECTOR B
12 COLLECTOR A
11 EMITTER A
10 _SHUTDOWN
9 _COMPENSATION
TOP VIEW
Figure 1. Pin Configuration
SL00174
ORDERING INFORMATION
DESCRIPTION
16-Pin Plastic Dual In-Line Package (DIP)
16-Pin Ceramic Dual In-Line Package (CERDIP)
16-Pin Small Outline (SO) Package
TEMPERATURE RANGE
0 to +70°C
0 to +70°C
0 to +70°C
ORDER CODE
SG3524N
SG3524F
SG3524D
DWG #
SOT38-4
0582B
SOT109-1
BLOCK DIAGRAM
V_IN 15
R_T ⁶
C_T 7
(RAMP)
INV INPUT ¹
N.I. INPUT ²
GROUND
(SUBSTRATE)
8
REF
REG
+5V
OSC
V_REF ¹⁶
+5V TO ALL
INTERNAL CIRCUITRY
+5V
OSCILLATOR
3 OUTPUT
FLIP FLOP
+5V
+5V
ERROR
–
AMP
+
1k
10
+
COMPARATOR
–
+5V
+
CL
–
9
COMPENSATION
SHUTDOWN _10k
NOR
NOR
4 +SENSE
5 _–SENSE
12 C_A
11
13 _CB
14 _EB
Figure 2. Block Diagram
SL00175
1994 Aug 31
1
853-0891 13721