Microsemi Corporation SG1543J, SG1543J-883B, SG1543J-DESC, SG1543L, SG1543L-883B Datasheet

SG1543/SG2543/SG3543

POWER SUPPLY OUTPUT SUPERVISORY CIRCUIT

DESCRIPTION

This monolithic integrated circuit contains all the functions necessary to monitor and control the output of a sophisticated power supply system. Over-voltage (O.V.) sensing with provision to trigger an external SCR “crowbar” shutdown; an under-voltage (U.V.) circuit which can be used to monitor either the output or to sample the input line voltage; and a third op amp/comparator usable for current sensing (C.L.) are all included in this IC, together with an independent, accurate reference generator.

Both over and under-voltage sensing circuits can be externally programmed for minimum time duration of fault before triggering. All functions contain open collector outputs which can be used independently or wire-ORed together; and although the SCR trigger is directly connected only to the over-voltage sensing circuit, it may be optionally activated by any of the other outputs, or from an external signal. The O.V. circuit also includes an optional latch and external reset capability.

The current sense circuit may be used with external compensation as a linear amplifier or as a high gain comparator. Although nominally set for zero input offset, a fixed threshold may be added with an external resistor. Instead of current limiting, this circuit may also be used as an additional voltage monitor.

The reference generator circuit is internally trimmed to eliminate the need for external potentiometers and the entire circuit may be powered directly from either the output being monitored or from a separate bias voltage.

FEATURES

∙Over-voltage, under-voltage, and current sensing circuits all included

∙Reference voltage trimmed to 1% accuracy

∙SCR "Crowbar" drive of 300mA

∙Programmable time delays

∙Open-collector outputs and remote activation capability

∙Total standby current less than 10mA

HIGH RELIABILITY FEATURES

- SG1543

♦Available to MIL-STD-883 and DESC SMD

♦LMI level "S" processing available

BLOCK DIAGRAM

11/91 Rev 1.1 2/94

LINFINITY Microelectronics Inc.

Copyright ã 1994	11861 Western Avenue ∞ Garden Grove, CA 92841
1	[phone] ∞ FAX: [phone]

SG1543/SG2543/SG3543

ABSOLUTE MAXIMUM RATINGS (Note 1)

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

40V

Indicator Output Sink Current ..........................................

50mA

Sense Inputs ......................................................................

+VIN

Operating Junction Temperature

150°C

SCR Trigger Current (Note 2) .........................................

300mA

Hermetic (J, L Packages) ............................................

Indicator Output Voltage .....................................................

40V

Plastic (N, DW Packages) ...........................................

150°C

Note 1. Values beyond which damage may occur.

Storage Temperature Range ............................

-65°C to 150°C

Note 2. At higher input voltages, a dissipation limiting resistor, RG , is required. See Figure 1.

THERMAL DATA

J Package:

Note A. Junction Temperature Calculation: TJ = TA + (PD x θJA).

Thermal Resistance-Junction to Case, θJC ..................

30°C/W

Thermal Resistance-Junction to Ambient, θJA ..............

80°C/W

Note B. The above numbers for θJC are maximums for the limiting

N Package:

thermal resistance of the package in a standard mount-

θJA

Thermal Resistance-Junction to Case, θJC ..................

40°C/W

ing configuration. The

numbers are meant to be

Thermal Resistance-Junction to Ambient, θJA .............

65°C/W

guidelines for the thermal performance of the device/pc-

DW Package:

board system. All of the above assume no ambient

Thermal Resistance-Junction to Case, θJC ...................

40°C/W

airflow.

Thermal Resistance-Junction to Ambient, θJA .............

95°C/W

L Package:

Thermal Resistance-Junction to Case, θJC ..................

35°C/W

Thermal Resistance-Junction to Ambient, θJA ............

120°C/W

RECOMMENDED OPERATING CONDITIONS (Note 3)

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

4.7V to 40V

Delay Timing Capcitor (Note 4)

.....................................

0 to 1μF

Current Limit Common Mode

Operating Ambient Temperature Range

-55°C to 125°C

Input Voltage Range .......................................

0V to +VIN -3V

SG1543 .........................................................

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

0 to 10mA

SG2543 ...........................................................

-25°C to 85°C

Indicator Output Voltage .........................................

4.7V to 40V

SG3543 ..............................................................

0°C to 70°C

Indicator Output Current ...........................................

0 to 10mA

Note 3: Range over which the device is functional.

Note 4. Larger value capacitor may be used with peak current limiting. See Figure 7.

ELECTRICAL CHARACTERISTICS

(Unless otherwise specified, these specifications apply over the operating ambient temperatures for SG1543 with -55°C ≤ TA ≤ 125°C, SG2543 with

-25°C ≤ TA ≤ 85°C, SG3543 with 0°C ≤ TA ≤ 70°C, and +VIN = 10V. Indicator outputs have 2KΩ pull-up resistor. Low duty cycle testing techniques are

used which maintains junction and case temperatures equal to the ambient temperature.)

Parameter

Test Conditions

SG1543/2543

SG3543

Units

Min.

Typ.

Max.

Min.

Typ.

Max.

Supply Section

Input Voltage Range

TJ = 25°C to TMAX

4.5

40

4.5

40

V

= 25°C

4.7

40

4.7

40

V

Supply Current

+VIN = 40V, Outputs open, TJ

7

10

7

10

mA

Reference Section

Output Voltage

TJ = 25°C

2.48

2.50

2.52

2.45

2.50

2.55

V

2.45

2.55

2.40

2.60

V

Line Regulation

+VIN = 5 to 30V

1

5

1

5

mV

Load Regulation

IREF = 0 to 10mA

1

10

1

10

mV

Short Circuit Current

VREF = 0V

12

25

40

12

25

40

mA

Temperature Stability

.005

.005

%/°C

11/91 Rev 1.1 2/94

LINFINITY Microelectronics Inc.

Copyright ã 1994	11861 Western Avenue ∞ Garden Grove, CA 92841
2	[phone] ∞ FAX: [phone]