ISL6142CB datasheet(14/23 Pages) INTERSIL

14 / 23 page

Applications Information

Typical Values for a representative

system; which assumes:

43V to 71V supply range; 48 nominal; UV = 43V; OV = 71V

1A of typical current draw; 2.5 Amp Over-Current

100

µF of load capacitance (CL); equivalent RL of 48Ω

(R = V/I = 48V/1A)

R1: 0.02

Ω (1%)

R2: 10

Ω (5%)

R3: 18k

Ω (5%)

R4: 549k

Ω (1%)

R5: 6.49k

Ω (1%)

R6: 10k

Ω (1%)

R7/R8: 400

Ω (1%)

R9: 4.99K

Ω (1%)

R10: 5.10K

Ω (10%)

C1: 150nF (25V)

C2: 3.3nF (100V)

C3: 1500pF (25V)

Q1: IRF530 (100V, 17A, 0.11

Ω)

Q2: N-Channel logic FET

Quick Guide to Choosing Component

Values

(See fig 29 for reference)

This section will describe the minimum components needed

for a typical application, and will show how to select

component values. Note that “typical” values may only be

good for this application; the user may have to select

alternate component values to optimize performance for

other applications. Each block will then have more detailed

explanation of how the device works, and alternatives.

R4, R5, R6 - together set the Under-Voltage (UV) and Over-

Voltage (OV) trip points. When the power supply ramps up

and down, these trip points (and their hysteresis) will

determine when the GATE is allowed to turn on and off (UV

and OV do not control the PWRGD / PWRGD output). The

input power supply is divided down such that when the

voltage on the OV pin is below its threshold and the UV pin is

above its threshold their comparator outputs will be in the

proper state signaling the supply is within its desired

operating range, allowing the GATE to turn on. The

equations below define the comparator thresholds for an

increasing (in magnitude) supply voltage.

FIGURE 29. TYPICAL APPLICATION WITH MINIMUM COMPONENTS

ISL6142

VDD

VEE

SENSE GATE

DRAIN

PWRGD

R3 C2

GND

-48V IN

-48V OUT

IS-

IS+

DIS

FAULT

ISOUT

R10

ADC

Logic

Supply

〈〉

()

-----------------------------------------

1.255

(EQ. 1)

〈〉

()

-----------------------------------------

1.255

(EQ. 2)

ISL6142, ISL6152

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