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SG2549Y

POWER SUPPLY OUTPUT SUPERVISORY CIRCUIT

Microsemi Corporation 

SG1549/SG2549/SG3549

ELECTRICAL CHARACTERISTICS

(VS = 5V, and over recomended operating temperature, unless otherwise specified.)

Parameter

Test Conditions

HI Output Section

Off Voltage

On Voltage

LO Output

Off Leakage

On Voltage

IL = 1mA

VPIN 5 = 40V

IL = 5mA

SG1549/2549

SG3549

Units

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

0 0.1

0 0.1 V

2.8 3.2

2.8 3.2

V

.01 1.0

.3 0.5

.01 1.0 µA

.3 0.5 V

TYPICAL SWITCHING CHARACTERISTICS (Note 4)

(V

S

=

5V,

T

A

=

25°C)

Parameter

Reset Minimum Pulse Width (TW1)

Delay from Reset to LO Output (T )

D(OFF)

LO Input Minimum Pulse Width (TW2)

Delay from LO Input to LO Output (TD(ON))

Delay from HI Input to LO Output (T )

D(ON)

Delay from HI Output to LO Output

Test Conditions

Amplitude = 3.0V

R

L

=

470Ω

to

V

S

LO CM Amplitude = 200mV

LO CM Amplitude = 200mV, RL = 470Ω to VS

Amplitude = 200mV, V = 5V

CM

LO CM Input = 200mV

Note 4: These parameters, although guaranteed, are not tested in production.

SG1549 Series

Min. Typ. Max. Units

150 300 ns

300 600 ns

50 300 ns

180 360 ns

300 900 ns

30 60 ns

DYNAMIC TEST CIRCUIT

SWITCHING WAVEFORMS

APPLICATION NOTES

HIGH LINE SENSING - The SG1549 will provide current sensing in the

positive supply line in the typical SG1524 single-ended switching

regulator application shown in Figure 1. The HI CM sense circuitry can

be used with input voltages between 2 and 40 volts.

A value for RSC is determined by dividing the 100mV input threshold by

the peak current desired. High-frequency noise, or switching transients,

can usually be eliminated by a small capacitor between pins 3 and 4.

Current control may be accomplished by either the HI OUTPUT pin

connected to the SG1524’s Shutdown pin, or the LO OUTPUT pin

connected directly to the Compensation Terminal. In either case,

activation of the current sense latch will tend to discharge the compen-

sation capacitor, CC, which may cause slow recovery from pulse limiting.

If this feature is desired, the LO OUTPUT pin may be used to discharge

a soft-start network instead of coupling directly to the SG1524. If it is not

desired, the use of a small value of CC, and perhaps a diode across RC,

will enhance recovery.

FIGURE 1 — HIGH LINE SENSING WITH THE SG1549 IN CONJUNCTION

WITH AN SG1524 PWM CONTROL IC

4/90 Rev 1.1 2/94

Copyright © 1994

LINFINITY Microelectronics Inc.

3

11861 Western Avenue ∞ Garden Grove, CA 92841

(714) 898-8121 ∞ FAX: (714) 893-2570

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