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

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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.

BLOCK DIAGRAM

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 avail-

♦♦

able

11/91 Rev 1.1 2/94 LINFINITY Microelectronics Inc.

1 (714) 898-8121

∞ ∞

∞ Garden Grove, CA 92841

∞ ∞

∞∞

∞ FAX: (714) 893-2570

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ABSOLUTE MAXIMUM RATINGS (Note 1)

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

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

SCR Trigger Current

(Note 2) .........................................

300mA

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

Note 1. Values beyond which damage may occur. Note 2. At higher input voltages, a dissipation limiting resistor, R

THERMAL DATA

J Package:

Thermal ResistanceThermal Resistance-

N Package:

Thermal ResistanceThermal Resistance-

DW Package:

Thermal ResistanceThermal Resistance-

L Package:

Thermal ResistanceThermal Resistance-

Junction to Case, θ Junction to Ambient, θ

.................. 30°C/W

.............. 80°C/W

.................. 40°C/W

............. 65°C/W

................... 40°C/W

............. 95°C/W

.................. 35°C/W

............ 120°C/W

40V +V

40V

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

Operating Junction Temperature

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

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

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

, is required. See Figure 1.

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.

SG1543/SG2543/SG3543

50mA

150°C 150°C

-65°C to 150°C

θJC are maximums for the limiting

numbers are meant to be

RECOMMENDED OPERATING CONDITIONS (Note 3)

Input Supply Voltage (+V Current Limit Common Mode

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

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

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

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

Note 3: Range over which the device is functional. Note 4. Larger value capacitor may be used with peak current limiting. See Figure 7.

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

4.7V to 40V

0V to +V

0 to 10mA

4.7V to 40V 0 to 10mA

-3V

Delay Timing Capcitor

(Note 4) .....................................

Operating Ambient Temperature Range

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

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

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

0 to 1µF

-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 SG1543 with -55°C ≤ TA ≤ 125°C, SG2543 with

-25°C ≤ T used which maintains junction and case temperatures equal to the ambient temperature.)

Supply Section

Input Voltage Range Supply Current

Reference Section

Output Voltage Line Regulation

Load Regulation Short Circuit Current Temperature Stability

≤ 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

TJ = 25°C to T

MAX

+VIN = 40V, Outputs open, TJ = 25°C

TJ = 25°C

= 5 to 30V

= 0 to 10mA

REF

= 0V

REF

SG3543SG1543/2543

Min. Typ. Max. Min. Typ. Max.

40 40 10

2.52

2.55 5

10 40

4.5

4.7

2.45

2.40

2.50 1

.005

4.5

4.7

2.48

2.45

2.50 1

.005

40 40 10

2.55

2.60 5

10 40

UnitsTest ConditionsParameter

V V

V mV mV mA

%/°C

11/91 Rev 1.1 2/94 LINFINITY Microelectronics Inc.

2 (714) 898-8121

∞ ∞

∞ Garden Grove, CA 92841

∞ ∞

∞∞

∞ FAX: (714) 893-2570

∞∞

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