SG3527AN Motorola, SG3527AN Datasheet

SG3527AN

Manufacturer Part Number

SG3527AN

Description

Pulse width modulator control circuit

Manufacturer

Motorola

Datasheet

1.SG3527AN.pdf (8 pages)

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Pulse Width

Modulator Control Circuits

improved performance and lower external parts count when implemented for

controlling all types of switching power supplies. The on–chip +5.1 V

reference is trimmed to

common–mode voltage range that includes the reference voltage, thus

eliminating the need for external divider resistors. A sync input to the

oscillator enables multiple units to be slaved or a single unit to be

synchronized to an external system clock. A wide range of deadtime can be

programmed by a single resistor connected between the C T and Discharge

pins. These devices also feature built–in soft–start circuitry, requiring only an

external timing capacitor. A shutdown pin controls both the soft–start circuitry

and the output stages, providing instantaneous turn off through the PWM

latch with pulsed shutdown, as well as soft–start recycle with longer

shutdown commands. The under voltage lockout inhibits the outputs and the

changing of the soft–start capacitor when V CC is below nominal. The output

stages are totem–pole design capable of sinking and sourcing in excess of

200 mA. The output stage of the SG3525A features NOR logic resulting in a

low output for an off–state while the SG3527A utilized OR logic which gives a

high output when off.

Compensation

MOTOROLA ANALOG IC DEVICE DATA

Noninv. Input

The SG3525A, SG3527A pulse width modulator control circuits offer

8.0 V to 35 V Operation

5.1 V

100 Hz to 400 kHz Oscillator Range

Separate Oscillator Sync Pin

Adjustable Deadtime Control

Input Undervoltage Lockout

Latching PWM to Prevent Multiple Pulses

Pulse–by–Pulse Shutdown

Dual Source/Sink Outputs: 400 mA Peak

OSC Output

C Soft–Start

INV. Input

Discharge

Shutdown

Ground

V CC

Sync

V ref

1.0% Trimmed Reference

5.0k

–

Error

Amp

Reference

Regulator

Oscillator

Representative Block Diagram

– PWM

–

1% and the error amplifier has an input

To Internal

5.0k

Circuitry

50 A

V REF

Lockout

Under–

Voltage

Latch

F/F

NOR

SG3525A Output Stage

Output B

Output A

SG3527A

Output Stage

SG3525AN

SG3525ADW

SG3527AN

Motorola, Inc. 1996

Device

PULSE WIDTH MODULATOR

Noninv. Input

OSC. Output

Discharge

Soft–Start

Inv. Input

CONTROL CIRCUITS

ORDERING INFORMATION

Sync

SG3525A

SG3527A

C T

R T

PIN CONNECTIONS

SEMICONDUCTOR

Order this document by SG3525A/D

TECHNICAL DATA

Temperature Range

T A = 0 to +70 C

Operating

(Top View)

PLASTIC PACKAGE

DW SUFFIX

CASE 751B

N SUFFIX

CASE 648

(SO–16L)

V ref

V CC

Output B

V C

Ground

Output A

Shutdown

Compensation

Plastic DIP

Package

SO–16L

Rev 2

Related parts for SG3527AN

SG3527AN Summary of contents

Page 1

... Output B R SG3525A Output Stage 13 Latch VC S Output Output B SG3525AN OR 14 SG3525ADW SG3527A SG3527AN Output Stage Motorola, Inc. 1996 Order this document by SG3525A/D SG3525A SG3527A PULSE WIDTH MODULATOR CONTROL CIRCUITS SEMICONDUCTOR TECHNICAL DATA N SUFFIX PLASTIC PACKAGE 16 CASE 648 1 DW SUFFIX PLASTIC PACKAGE ...

Page 2

... Holding Pin 10 high for a longer duration, however, will ultimately discharge this external capacitor, recycling slow turn–on upon release. Pin 10 should not be left floating as noise pickup could conceivably interrupt normal operation. MOTOROLA ANALOG IC DEVICE DATA Min Max Unit 8.0 ...

Page 3

... NOTES low = 0 for SG3525A, 3527A T high = +70 C for SG3525A, 3527A 5. Since long term stability cannot be measured on each device before shipment, this specification is an engineering estimate of average stability from lot to lot. 6. Tested at f osc = 40 kHz ( 3 0. MOTOROLA ANALOG IC DEVICE DATA SG3525A SG3527A Symbol V ref Reg line ...

Page 4

... V – 0.2 0.4 – 1.0 2 – – 6.0 7.0 8.0 V – – 200 – 100 600 – 50 300 – 0.2 0 – 0 0.1 Out A 11 1.0k, 1.0W (2) 14 Out B 12 Gnd Softstart 8 + 5 ref 2.0k Shutdown MOTOROLA ANALOG IC DEVICE DATA ...

Page 5

... 7. 2.0k 14k Q11 3 Q10 2.0k Sync 5.0pF 7 Discharge 400 23k Q12 Q7 1.0k 1.0k 12 Gnd MOTOROLA ANALOG IC DEVICE DATA SG3525A SG3527A Figure 2. Oscillator Discharge Time versus R D 500 400 300 * 200 100 0.2 0.5 1.0 9 – + 4 + 3.5 3.0 2.5 2.0 1.5 1.0 ...

Page 6

... C1 and C2. Figure 11. Driving Transformers in a Half–Bridge Configuration +V supply SG3525A B Gnd 12 Low power transformers can be driven directly by the SG3525A. Automatic reset occurs during deadtime, when both ends of the primary winding are switched to ground. MOTOROLA ANALOG IC DEVICE DATA V C 11, 14 Output ...

Page 7

... 0.25 (0.010) –A– –T– SEATING PLANE 0.25 (0.010 MOTOROLA ANALOG IC DEVICE DATA SG3525A SG3527A OUTLINE DIMENSIONS N SUFFIX PLASTIC PACKAGE CASE 648–08 ISSUE SEATING –T– PLANE SUFFIX PLASTIC PACKAGE CASE 751B–05 (SO–16L) ISSUE J –B– 0.25 (0.010) ...

Page 8

... Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation consequential or incidental damages. “ ...

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