Datasheet SG1548J, SG1548J-883B, SG1548J-DESC, SG1548L, SG1548L-883B Datasheet (Microsemi Corporation)

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11/91 Rev 1.2 5/97 LINFINITY Microelectronics Inc.

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∞ Garden Grove, CA 92841

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SG1548/SG2548/SG3548

QUAD POWER FAULT MONITOR

DESCRIPTION

The SG1548 is an integrated circuit capable of monitoring up to four positive DC supply voltages simultaneously for overvoltage and undervoltage fault conditions. An on-chip inverting op amp also allows monitoring one negative DC voltage. The fault tolerance window is accurately programmable from ±5% to ±40% using a simple divider network on the 2.5V reference. A single external capacitor sets the fault indication delay, eliminating false outputs due to switching noise, logic transition current spikes, and short-term AC line interruptions. An additional comparator referenced to 2.5V allows the AC line to be monitored for undervoltage conditions or for generation of a line clock. The comparator can also be used for programmable undervoltage lockout in a switching power supply. Uncommitted collector and emitter outputs permit both inverting and non-inverting operation. External availability of the precision 2.5V reference and open-collector logic outputs permit expansion to monitor additional voltage using available open-collector quad comparators.

FEATURES

••

• Monitors four DC voltages and the AC line

••

• Precision 2.5V ±1% low-drift reference

••

• Fault tolerance adjustable from ±5% to ±40%

••

• ±3% trip threshold tolerance over temperature

••

• Separate 10mA, 40V overvoltage, undervoltage

and AC line fault outputs

••

• Fault delay programmable with a single capacitor

••

• 30mV comparator hysteresis to prevent oscilla-

tions

••

• On-chip inverting op amp for negative voltage

••

• Open-collector output logic or expandability

••

• Operation from 4.5V to 40V supply

HIGH RELIABILITY FEATURES - SG1548

♦♦

♦ Available to MIL-STD-883 ♦♦

♦♦

♦ Radiation data available ♦♦

♦♦

♦ LMI level "S" processing available

BLOCK DIAGRAM

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ABSOLUTE MAXIMUM RATINGS (Note 1)

SG1548/SG2548/SG3548

Inverting Op Amp Output Current ....................................

Operating Junction Temperature

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

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

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

Lead Temperature ...........................................................

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

Fault Output Collector Voltage ............................................

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

Fault Output Sink Current ................................................

Line Sense Input Current .................................................

Inverting Op Amp Input Current ........................................

40V 40V

-0.3V to 6.0V 20mA ±1mA

-5mA

25mA

150°C 150°C

-65°C to 150°C 300°C

Note 1. Values beyond which damage may occur.

THERMAL DATA

J Package:

Thermal Resistance-

Junction to Case, θ

................... 30°C/W

Thermal Resistance-

Junction to Ambient, θ

.............. 80°C/W

N Package:

Thermal Resistance-

Junction to Case, θ

.................. 40°C/W

Thermal Resistance-

Junction to Ambient, θ

............. 65°C/W

DW Package:

Thermal Resistance-

Junction to Case, θ

.................. 40°C/W

Thermal Resistance-

Junction to Ambient, θ

............. 95°C/W

L Package:

Thermal Resistance-

Junction to Case, θ

.................. 35°C/W

Thermal Resistance-

Junction to Ambient, θ

........... 120°C/W

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

θJC are maximums for the limiting

thermal resistance of the package in a standard mounting configuration. The θ

numbers are meant to be guidelines for the thermal performance of the device/pcboard system. All of the above assume no ambient airflow.

2.625

3.500

2.375

1.500 ±0.6

100

DC Sense Inputs Section

PIN 1

= 0.95 x V

REF

PIN 1

= 0.60 x V

REF

PIN 1

= 0.95 x V

REF

PIN 1

= 0.60 x V

REF

SENSE

= 1.5V to 3.5V

= 4.5V to 35V

Overvoltage Threshold Undervoltage Threshold Input Bias Current

Threshold Supply Rejection

4.5V to 35V

5.0V to 35V

1.5V to 2.45V ±5% to ±40%

0 to 10mA

Supply Voltage Range

±25% Maximum Fault Window

(Note 3) ..............

±40% Maximum Fault Window ...........................

Lower Threshold Input Range .............................

Fault Tolerance Window Range ..........................

Fault Output Sink Current Range .............................

Line Sense Output Current Range ...........................

Voltage Reference Output Current ...........................

Operating Ambient Temperature Range

SG1548 .........................................................

SG2548 ...........................................................

SG3548 ...............................................................

0 to 10mA 0 to 10mA

-55°C to 125°C

-25°C to 85°C 0°C to 70°C

Note 2. Range over which the device is functional. Note 3. Limited by inverter amplifier positive swing at -55°C.

RECOMMENDED OPERATING CONDITIONS (Note 2)

ELECTRICAL CHARACTERISTICS

(Unless otherwise specified, these specifications apply over the operating ambient temperatures for SG1548 with -55°C ≤ TA ≤ 125°C, SG2548 with

-25°C ≤ TA ≤ 85°C, SG3548 with 0°C ≤ TA ≤ 70°C, and +VIN = 15V. Low duty cycle pulse testing techniques are used which maintains junction and case temperatures equal to the ambient temperature.)

Reference Section (Note 4)

TJ = 25°C Over Temperature +V

= 4.5V to 35V

= 0 to 10mA

REF

= 0V

Output Voltage Line Regulation

Load Regulation Short Circuit Current

4.8+VIN = 40VSupply Current mA10

Min. Typ. Max.

SG3548SG1548/2548

Test ConditionsParameter Units

Supply Section

-0.4V

PIN 1

= 1.5V to 2.45VInput Bias Current µA

Fault Window Generator Section

Min. Typ. Max.

10 4.8

2.475

2.450

2.500 1

2.525

2.550 5

10 50

2.475

2.450

2.500 1

2.525

2.550 5

10 50

V mV mV mA

-2.0 -0.4 -2.0

2.547

3.396

2.304

1.455 60

2.704

3.606

2.447

1.545 ±2.0

2.547

3.396

2.304

1.455 60

2.625

3.500

2.375

1.500 ±0.6

100

2.704

3.606

2.447

1.545 ±2.0

V V V

V µA dB

Note 4. IL = 0mA

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Fault Logic Outputs (Each output)

= 40V

= 10mA

Collector Leakage Current Collector Saturation Voltage

2.500 25

1 1

0.2 13

AC Line Sense Section

PIN 5

= Low to High

PIN 5

= 2.5V

= 40V

= 10mA

PIN 5

= 1mA

PIN 5

= -1mA

Comparator Threshold Comparator Hysteresis Input Bias Current Collector Leakage Current Collector Saturation Voltage Emitter Output Voltage Diode Clamp Voltage

2.440

6.0

-0.3

2.560 2

0.5

7.5

-1.0

2.440

6.0

-0.3

2.500 25

1 1

0.2 13

-0.3

3.5

1.0

100

3.2 72

Inverting Op Amp Section

(Note 5)

SOURCE

= 5mA

SINK

= 5mA

= 10K

= 4.5V to 35V

Input Offset Voltage Input Bias Current Output High Voltage Output Low Voltage Large Signal Voltage Gain Output Source Current Power Supply Rejection Ratio

µA

V V

1.250 25 50

0.1

+3.2

1.200

32.5V

PIN 8

= 0V

PIN 8

= 0mA

PIN 8

= 0mA

Comparator Threshold Comparator Hysteresis Delay Charging Current On Saturation Voltage OFF Clamp Voltage

SG1548/SG2548/SG3548

Min. Typ. Max.

SG3548SG1548/2548

Test ConditionsParameter Units

ELECTRICAL CHARACTERISTICS (continued)

Min. Typ. Max.

APPLICATION INFORMATION

Note 5. +VIN = 4.5V.

Fault Delay Section

1.300

67.5

0.2

+3.6

1.200

32.5

1.250 25 50

0.1

+3.2

1.300

67.5

0.2

+3.6

µA

V V

-1.0

1.9 25

3.2 72

-0.3

3.5

1.0

100

-1.0

1.9 25

2.560 2

0.5

7.5

-1.0

µA µA

V V V V

µA

0.5

0.2

0.5

0.2

SETTING THE FAULT TOLERANCE WINDOW

The fault tolerance window is set by applying a voltage less than the +2.50Vreference to the Lower Threshold input (Pin 1). The voltage is obtained by a resistor divider from the reference (Pin 3) to ground. If ±5% tolerance is desired, then 95% of the reference (+2.375V) is applied to Pin 1. If ±40% is wanted, then 60% of the reference (+1.50V) is applied. In the example on the back page, the tolerance is ±5%. The nominal overvoltage and undervoltage thresholds are centered about the reference at +2.625V and +2.375V (+2.500V ±0.125V).

SCALING THE MONITORED SUPPLY VOLTAGES

Each positive voltage to be monitored is divided down to +2.50V with a resistor network and connected to one of the Sense inputs. Unused Sense inputs should be connected to the reference. This will not increase the bias current. A variation of the monitored voltages out of the programmed tolerance range will cause the appropriate overvoltage or undervoltage fault output to switch LOW. The effective tolerance on any input may be broadened with an additional resistor to the voltage reference. The example on the back page shows a ±10% tolerance on the +5Vsupply although the SG1548 is programmed for a ±5% tolerance. The procedure for calculating the resistor value is found in the SG1548 Application Note.

MONITORING A NEGATIVE VOLTAGE

A negative voltage can be converted to a positive one and simultaneously scaled to +2.50V by using the internal operational amplifier as an inverter. Only an input resistor and feedback resistor are required.

SETTING THE FAULT DELAY

A single capacitor at the Delay pin sets the time an out-oftolerance fault must persist before a fault is actually declared. This feature allows switching noise on the supplies to be rejected. The delay time is given by: Delay = 25ms/µF .

AC LINE MONITORING

The AC line voltage can be monitored for single-cycle dropouts with the few components shown in the example. A half-wave rectifier charges the capacitor on positive line cycles. After the positive peak and during the negative line cycle the capacitor discharges from a fixed voltage controlled by the internal Zener diode. If a positive cycle is missing, the capacitor discharges to below the +2.5V trip point of the comparator, causing the output transistor to turn on.

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SG1548/SG2548/SG3548

APPLICATION EXAMPLE

In this example, the SG1548 simultaneously monitors four DC voltages: +5V, +24V, and ±15V. Three different fault tolerances are programmed: ±5% on the two 15V supplies, ±10% on the +5V supply, and ±20% on the +24V supply. The 5µF delay capacitor provides 125 milliseconds of fault delay.

CONNECTION DIAGRAMS & ORDERING INFORMATION (See Notes Below)

Ambient

Temperature Range

Part No.Package Connection Diagram

16-PIN CERAMIC DIP J - PACKAGE

SG1548J/883B -55°C to 125°C SG1548J -55°C to 125°C SG2548J -25°C to 85°C SG3548J 0°C to 70°C

SG2548N -25°C to 85°C SG3548N 0°C to 70°C

16-PIN PLASTIC DIP N - PACKAGE

2 3 4 5 6 7 8

11516

14 13

12 11

2 3 4 5 6 7 8

16-PIN WIDE BODY PLASTIC S.O.I.C. DW - PACKAGE

SG2548DW -25°C to 85°C SG3548DW 0°C to 70°C

INV. OUTPUT INV. INPUT SENSE 4 SENSE 3 SENSE 2 SENSE 1 U.V. FAULT O.V. FAULTDELAY

REF

GROUND

LOWER THRESHOLD

COLLECTOR OUTPUT

EMITTER OUTPUT

LINE SENSE

14 13

12 11

DELAY

REF

GROUND

LOWER THRESHOLD

LINE SENSE

COLLECTOR OUTPUT

EMITTER OUTPUT

INV. OUTPUT INV. INPUT SENSE 4 SENSE 3 SENSE 2 SENSE 1 U.V. FAULT O.V. FAULT

20-PIN CERAMIC (LCC) LEADLESS CHIP CARRIER L- PACKAGE

SG1548L/883B -55°C to 125°C SG1548L -55°C to 125° C

Note1. Contact factory for JAN and DESC product availability.

2. All parts are viewed from the top.

11. N.C.

12. O.V. FAULT

13. U.V. FAULT

14. SENSE 1

15. SENSE 2

16. N.C.

17. SENSE 3

18. SENSE 4

19. INV. INPUT

20. INV. OUTPUT

1. N.C.

2. LOWER THRESHOLD

3. GROUND

4. V

REF

5. +V

6. N.C.

7. LINE SENSE

8. EMITTER OUTPUT

9. COLLECTOR OUTPUT

4 5 6 7 8

321

9 11121310

20 19

10.DELAY