SG3549 판매점 - CURRENT SENSE LATCH

SG3549 반도체 회로 부품 판매점

CURRENT SENSE LATCH

Microsemi Corporation

SG1549/SG2549/SG3549

CURRENT SENSE LATCH

DESCRIPTION

This monolithic integrated circuit is an analog latch device with digital reset. It was

specifically designed to provide pulse-by-pulse current limiting for switch-mode power

supply systems, but many other application are also feasible. Its function is to provide

a latching switch action upon sensing an input threshold voltage, with reset accom-

plished by an external clock signal. This device can be interfaced directly with many

kinds of pulse width modulating control IC's, including the SG1524, SG1525A and

SG1527A.

The input threshold for the latch circuit is 100mV, which can be referenced either to

ground or to a wide-ranging positive voltage. There are high and low-going output

signals available, and both the supply voltage and clock signal can be taken directly

from an associated PWM control chip.

With delays in the range of 200 nanoseconds, this latch circuit is ideal for fast reaction

sensing to provide overall current limiting, short circuit protection, or transformer

saturation control.

FEATURES

• Current sensing with 100mV

threshold

• Common-mode input at ground or

to 40V

• Complementary outputs

• Automatic reset from PWM clock

• 180ns delay

• Interface direct to SG1524,

SG1525A, SG1527A

HIGH RELIABILITY FEATURES

- SG1549

♦ Available to MIL-STD-883

♦ LMI level "S" processing available

♦ Radiation data available

BLOCK DIAGRAM

SCHEMATIC

4/90 Rev 1.1 2/94

LINFINITY Microelectronics Inc.

1 11861 Western Avenue ∞ Garden Grove, CA 92841

(714) 898-8121 ∞ FAX: (714) 893-2570

SG1549/SG2549/SG3549

ABSOLUTE MAXIMUM RATINGS (Note 1)

Input Supply Voltage, VS ..................................................... 25V

HI CM Input Voltage ............................................................ 40V

LO Output "off" Voltage ....................................................... 40V

LO Output "on" current ..................................................... 25mA

Note 1. Values beyond which damage may occur.

THERMAL DATA

Y Package:

Thermal Resistance-Junction to Case, θJC .................. 50°C/W

Thermal Resistance-Junction to Ambient, θJA ............ 130°C/W

M Package:

Thermal Resistance-Junction to Case, θJC .................. 60°C/W

Thermal Resistance-Junction to Ambient, θJA ............. 95°C/W

Operating Junction Temperature

Hermetic (Y Package) .................................................. 150°C

Plastic (N Package) ......................................................150°C

Storage Temperature Range ............................ -65°C to 150°C

Note A.

Junction Temperature Calculation:

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

thermal resistance of the package in a standard mount-

ing configuration. The θJA numbers are meant to be

guidelines for the thermal performance of the device/pc-

board system. All of the above assume no ambient

airflow.

RECOMMENDED OPERATING CONDITIONS (Note 2)

Input Supply Voltage, VS .................................................... 5.0V

HI CM Input Voltage .................................................. 2V to 40V

LO Output "off" Voltage ............................................. 5V to 40V

LO Output "on" Current ............................................. 0 to 10mA

Reset LO Voltage ..................................................... 0V to 0.8V

Note 2. Range over which the device is functional.

Reset HI Voltage .................................................... 2.5V to 5.0V

Operating Ambient Temperature Range

SG1549Y ....................................................... -55°C to 125°C

SG2549Y or M ................................................. -25°C to 85°C

SG3549Y or M .................................................... 0°C to 70°C

ELECTRICAL CHARACTERISTICS

(Unless

otherwise

specified,

these

specifications

apply

over

the

operating

ambient

temperatures

for

SG1549

with

-55°C

≤

125°C,

SG2549

with

-25°C ≤ TA ≤ 85°C, SG3549 with 0°C ≤ TA ≤ 70°C, and VS = 5V. Low duty cycle pulse testing techniques are used which maintains junction and case

temperatures equal to the ambient temperature.)

Parameter

Test Conditions

SG1549/2549

SG3549

Units

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

Supply Section

Supply Current

LO CM Input Section (Note 3)

Threshold Voltage

Input Impedance

HI CM Input Section (Note 3)

VPIN 8 = 5V

VPIN 8 = 20V

Pin 1 & 2 shorted, TA = 25°C

pin 1 & 2 shorted

VPIN 3 = 50mV, TA = 25°C

VPIN 3 = 50mV

10 15

2 5 mA

10 15 mA

80 100 120 80 100 120

70 100 130 70 100 130

400 500 600 400 500 600

300 500 700 300 500 700

Ω

Threshold Voltage

Input Current

Clock Reset Section

V = 2V, Pin 3 open, T = 25°C

CM A

VCM = 40V, Pin 3 open, TA = 25°C

VCM = 2V, Pin 3 open

V = 40V, Pin 3 open

VPIN 1 = VPIN 2 = 40V

80 100 120 80

70 100 130 70

200 300

100 120

100 130

200 300

µA

Min. Trigger Voltage

Input Current

V = 4V

PIN 7

2.0 2.5

20 40

2.0 2.5 V

20 40 µA

Note 3. Input threshold voltages and supply current are directly proportional to supply voltage, VS .

4/90 Rev 1.1 2/94

LINFINITY Microelectronics Inc.

2 11861 Western Avenue ∞ Garden Grove, CA 92841

(714) 898-8121 ∞ FAX: (714) 893-2570

PDF 파일 내의 페이지 : 총 4 페이지

제조업체: Microsemi Corporation

( microsemi )

SG3549 latch

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SG3549 반도체 회로 부품 판매점

CURRENT SENSE LATCH

국내 전력반도체 판매점

일반적인 전자부품 판매점

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