LINFINITY SG1524, SG2524, SG3524 Service Manual

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SG1524/SG2524/SG3524

REGULATING PULSE WIDTH MODULATOR

DESCRIPTION

This monolithic integrated circuit contains all the control circuitry for a
regulating power supply inverter or switching regulator. Included in a 16­pin 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 applications. The SG1524 is specified for operation
over the full military ambient temperature range of -55°C to +125°C, the
SG2524 for -25°C to +85°C, and the SG3524 is designed for commercial
applications of 0°C to +70°C.

BLOCK DIAGRAM

FEATURES

••

• 8V to 40V operation

••

••

• 5V reference

••

••

• Reference line and load regulation of 0.4%

••

••

• Reference temperature coefficient < ± 1%

••

••

• 100Hz to 300KHz oscillator range

••

••

• Excellent external sync capability

••

••

• Dual 50mA output transistors

••

••

• Current limit circuitry

••

••

• Complete PWM power control circuitry

••

••

• Single ended or push-pull outputs

••

••

• Total supply current less than 10mA

••

HIGH RELIABILITY FEATURES - SG1524

♦♦

♦ Available to MIL-STD-883B and DESC SMD

♦♦
♦♦

♦ MIL-M-38510/12601BEA - JAN1524J

♦♦
♦♦

♦ Radiation data available

♦♦
♦♦

♦ LMI level "S" processing available

♦♦

4/90 Rev 1.1 2/94 LINFINITY Microelectronics Inc.

Copyright  1994 11861 Western Avenue

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∞ Garden Grove, CA 92841

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ABSOLUTE MAXIMUM RATINGS (Note 1)

Input Voltage (+VIN)............................................................. 42V

Collector Voltage ................................................................ 40V

Logic Inputs...........................................................-0.3V to 5.5V

Current Limit Sense Inputs ...................................-0.3V to 0.3V

Output Current (each transistor) .................................... 100mA

Reference Load Current .................................................. 50mA

Note 1. Values beyond which damage may occur.

THERMAL DATA

J Package:

Thermal Resistance­Thermal Resistance-

N Package:

Thermal Resistance­Thermal Resistance-

D Package:

Thermal Resistance­Thermal Resistance-

L Package:

Thermal Resistance­Thermal Resistance-

Junction to Case, θ
Junction to Ambient, θ

Junction to Case, θ
Junction to Ambient, θ

Junction to Case, θ
Junction to Ambient, θ

Junction to Case, θ
Junction to Ambient, θ

.................. 30°C/W

JC

.............. 80°C/W

JA

.................. 40°C/W

JC

............. 65°C/W

JA

................... 50°C/W

JC

............ 120°C/W

JA

.................. 35°C/W

JC

........... 120°C/W

JA

SG1524/SG2524/SG3524

Oscillator Charging Current ................................................5mA

Operating Junction Temperature

Hermetic (J, L Packages) .............................................150°C

Plastic (N, D Packages) ............................................... 150°C

Storage Temperature Range .............................-65°C to 150°C

Lead Temperature (Soldering, 10 seconds) ....................300°C

Note A. Junction Temperature Calculation: TJ = TA + (PD x θJA).
Note B. The above numbers for

thermal resistance of the package in a standard mount­ing configuration. The θ
guidelines for the thermal performance of the device/pc­board system. All of the above assume no ambient
airflow.

θJC are maximums for the limiting

numbers are meant to be

JA

RECOMMENDED OPERATING CONDITIONS (Note 2)

Input Voltage (+VIN) ...................................................

Collector Voltage .......................................................

Error Amp Common Mode Range ..........................

Current Limit Sense Common Mode Range ........

Output Current (each transistor) ...............................

Reference Load Current ...........................................

Oscillator Charging Current ..................................

Note 2: Range over which the device is functional and parameter limits are guaranteed.

8V to 40V
0V to 40V

1.8V to 3.4V

-0.3V to 0.3V
0 to 50mA
0 to 20mA

30µA to 2mA

Oscillator Frequency Range .........................

Oscillator Timing Resistor (R
Oscillator Timing Capacitor (C
Operating Ambient Temperature Range

SG1524 .........................................................

SG2524 ...........................................................

SG3524 ...............................................................

) ........................

T

) ............................

T

100Hz to 300KHz

1.8KΩ to 100KΩ
1nF to 1.0µF

-55°C to 125°C

-25°C to 85°C
0°C to 70°C

ELECTRICAL CHARACTERISTICS

(Unless otherwise specified, these specifications apply over the operating ambient temperatures for SG1524 with -55° C ≤ TA ≤ 125°C, SG2524 with

-25°C ≤ T
case temperatures equal to the ambient temperature.)

Reference Section

Output Voltage
Line Regulation
Load Regulation
Temperature Stability
Total Output Voltage Range (Note 7)
Short Circuit Current

Note 3. I

≤ 85°C, SG3524 with 0°C ≤ TA ≤ 70°C, and +VIN = 20V. Low duty cycle pulse testing techniques are used which maintains junction and

A

= 0mA

L

(Note 3)

(Note 7)

TJ = 25°C

= 8V to 40V

V

IN

I

= 0 to 20mA

L

Over Operating Temperature Range
Over Line, Load and Temperature
V

= 0V

REF

Min. Typ. Max.

5.00

4.80

5.20
20
50
50

4.80
25

50

5.20
150

SG3524SG1524/2524

Min. Typ. Max.

4.60

5.00505.40

4.60
25

30
50
50

5.40
150

UnitsTest ConditionsParameter

V
mV
mV
mV

V
mA

4/90 Rev 1.1 2/94 LINFINITY Microelectronics Inc.

Copyright  1994 11861 Western Avenue

2 [phone]

∞ ∞

∞ Garden Grove, CA 92841

∞ ∞

∞∞

∞ FAX: [phone]

∞∞