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

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

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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

Junction to Case, θ
Junction to Ambient, θ

Junction to Case, θ
Junction to Ambient, θ

Junction to Case, θ
Junction to Ambient, θ

JC

JC

JC

JC

.................. 30°C/W

.............. 80°C/W

JA

.................. 40°C/W

............. 65°C/W

JA

................... 40°C/W

............. 95°C/W

JA

.................. 35°C/W

............ 120°C/W

JA

40V
+V

40V

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

Operating Junction Temperature

IN

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

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

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

, is required. See Figure 1.

G

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

JA

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.

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

IN

4.7V to 40V

0V to +V

0 to 10mA

4.7V to 40V
0 to 10mA

IN

-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

A

TJ = 25°C to T

MAX

+VIN = 40V, Outputs open, TJ = 25°C

TJ = 25°C

= 5 to 30V

+V

IN

I

= 0 to 10mA

REF

V

= 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

12

7

2.50
1

1

25

.005

4.5

4.7

2.48

2.45

12

7

2.50
1

1

25

.005

40
40
10

2.55

2.60
5

10
40

UnitsTest ConditionsParameter

V
V

mA

V

V
mV
mV
mA

%/°C

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ELECTRICAL CHARACTERISTICS (continued)

SG1543/SG2543/SG3543

Comparator Section

Input Threshold

(Note 5)

T

= 25°C

J

Input Hysteresis
Input Bias Current

Sense input = 0V
Delay Saturation
Delay High Level
Delay Charging Current
Indicate Saturation
Indicate Leakage
Propagation Delay

= 0V

V

D

I

= 10mA

L

= 40V

V

IND

V

O.V. INPUT

C

= 0

D

= 1µF

C

D

= 2.7V, V

U.V. INPUT

SCR Trigger Section

= 5V, RG = 0, VO = 0

Peak Output Current
Peak Output Voltage
Output Off Voltage
Remote Activate Current
Remote Activate Voltage
Reset Current
Reset Voltage
Output Current Rise Time
Prop. Delay from REM. ACT. Pin
Prop. Delay fom O.V. INPUT Pin

+V

IN

+V

= 15V, IO = 100mA

IN

+V

= 40V, RL = 1KΩ

IN

REM. ACT. pin = Gnd

REM. ACT pin open

RESET pin = Gnd, REM. ACT. = Gnd

RESET pin open, REM. ACT. = Gnd

RL = 50Ω, TJ = 25°C, CD = 0

REM. ACT.
O.V. INPUT

= 0.4V

= 2.7V

V
V

Current Limit Section

Input Voltage Range
Input Bias Current
Input Offset Voltage

OFFSET/COMP pin open, VCM = 0V

OFFSET/COMP pin open, V

10kΩ from OFFSET/COMP pin to Gnd,T

0 ≤ V

CMRR
AVOL
Output Saturation
Output Leakage
Small Signal Bandwidth
Propagation Delay

Note 5. Input voltage rising on O.V. Input and falling on U.V. Input.

≤ 12V, VIN = 15V

CM

OFFSET/COMP pin open, V

= 10mA

I

L

V

= 40V

IND

= 0dB, TJ = 25°C

A

V

V

OVERDRIVE

= 100mV, TJ = 25°C

= 2.3V , TJ = 25°C

= 0V,

CM

CM

= 0V

=25°C

J

SG1543/2543 SG3543

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

2.45

2.50

2.55

2.40

2.50

2.60

2.40

200

100

12

0

80
60
72

25

0.3

0.2
6

250

0.2

.01

400

10

200

13

0

0.4
2

0.4
2

400
300
500

0.3
0

100

70
80

0.2

.01

5

200

2.60

1.0

0.5
8

300

0.5

1.0

400

0.1

0.8
6

0.8
6

VIN-3V

1.0

10

120

0.5

1.0

2.35
25

0.3

0.2

200

250

0.2

0.1

400

10

10012200

13

0.4

0.4

400
300
500

0

0.3

70

100

60

70

72

80

0.2
.01

200

2.65

1.0

0.5

6

8

300

0.5

1.0

400

0.1

0

0.8
6

2

0.8
6

2

VIN-3V

1.0

15

0

130

0.5

1.0

5

UnitsTest ConditionsParameter

V
V

mV

µA

V
V

µA

V

µA

ns

ms

mA

V
V

mA

V

mA

V

mA/µs

ns
ns

V

µA
mV
mV

dB

dB

V

µA

MHz

ns

CHARACTERISTIC CURVES

FIGURE 1.
SCR TRIGGER POWER LIMITING

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FIGURE 2 .
ACTIVATION DELAY VS. CAPACITOR VALUE

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CHARACTERISTIC CURVES (continued)

SG1543/SG2543/SG3543

FIGURE 3.
COMPARATOR INPUT HYSTERESIS

FIGURE 5.
CURRENT LIMIT AMPLIFIER GAIN

APPLICATION INFORMATION

FIGURE 4.
CURRENT LIMIT INPUT THRESHOLD

FIGURE 6.
CURRENT LIMIT AMPLIFIER FREQUENCY RESPONSE

FIGURE 7 - SURGE LIMIT CIRCUIT FOR LARGE DELAY CAPACITORS FIGURE 8 - INPUT LINE MONITOR

The 100 ohm resistor limits the peak discharge current into the
SG1543 while the external PNP transistor provides a high peak­current discharge path for the delay capacitor.

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APPLICATION INFORMATION (continued)

FIGURE 9 - TYPICAL APPLICATION CIRCUIT

SG1543/SG2543/SG3543

The values for the external components are
determined as follows:

1000

Current limit input threshold, V

is determined by the current loop dynamics

C

S

Peak current to load, IP ≈
Short circuit current, I

=

SC

Low output voltage limit, VO (Low) =
High output voltage limit, VO (High) =
Voltage sensing delay, t
SCR trigger power limiting resistor, RG >

≈

TH

V

TH

+

R

SC

V

TH

R

SC

= 10,000 C

D

R

1

V

R

O

R

R2+R

()

SC

2.5 (R4+R5+R6)
R5+R

2.5 (R4+R5+R6)

D

VIN - 5

0.2

2

3

6

R

6

FIGURE 10 - SENSING MULTIPLE SUPPLY VOLTAGES

FIGURE 11 - OVERCURRENT SHUTDOWN

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CONNECTION DIAGRAMS & ORDERING INFORMATION (See Notes Below)

SG1543/SG2543/SG3543

16-PIN CERAMIC DIP
J - PACKAGE

16-PIN PLASTIC DIP
N - PACKAGE

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

20-PIN CERAMIC
LEADLESS CHIP CARRIER
L- PACKAGE
(Note 3)

Part No.Package

Ambient

Temperature Range

SG1543J/883B -55°C to 125°C
SG1543J/DESC -55°C to 125°C
SG1543J -55°C to 125°C
SG2543J -25°C to 85°C
SG3543J 0°C to 70°C

SG2543N -25°C to 85°C
SG3543N 0°C to 70°C

SG2543DW -25°C to 85°C
SG3543DW 0°C to 70°C

SG1543L/883B -55°C to 125°C
SG1543L -55°C to 125°C

Connection Diagram

S.C.R. TRIGGER

REMOTE ACTIVATE

S.C.R. TRIGGER

REMOTE ACTIVATE

O.V. INDICATE

1. N.C.

2. SCR TRIGGER

3. REMOTE ACTIVATE

4. RESET

5. O.V. INDICATE

6. N.C.

7. O.V. DELAY

8. O.V. INPUT

9. U.V. INPUT

10. U.V. DELAY

RESET

O.V. INDICATE

O.V. DELAY

O.V. INPUT
U.V. INPUT

U.V. DELAY

RESET

O.V. DELAY

O.V. INPUT

U.V. INPUT

U.V. DELAY

4
5

6
7
8

1
2
3

4
5
6
7
8

1
2
3
4
5
6
7
8

321

911121310

16

+V
V

15
14

GROUND

13

C.L. OUTPUT

12

OFFSET/COMP

11

C.L. N.I. INPUT

10

C.L. INV. INPUT

9

U.V. INDICATE

16
15
14
13
12
11
10

9

20 19

IN

REF

+V

IN

V

REF

GROUND
C.L. OUTPUT
OFFSET/COMP
C.L. N.I. INPUT
C.L. INV. INPUT
U.V. INDICATE

11. N.C.

12. U.V. INDICATE

18

13. C.L. INV. INPUT

14. C.L. N.I. INPUT

17

15. OFFSET/COMP

16

16. N.C.

15

17. C.L. OUTPUT

14

18. GROUND

19. V

20. +V

REF

IN

Note 1. Contact factory for JAN and DESC product availablity.

2. All packages are viewed from the top.

3. Consult factory for product availability.

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