AMC7140 데이터 시트보기 (PDF) - Unspecified

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AMC7140

700mA HIGH VOLTAGE ADJUSTABLE CURRENT REGULATOR WITH ENABLE CONTROL

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AMC7140

ABSOLUTE MAXIMUM RATINGS (Note)

Input Voltage, VDD

Output Voltage, VOUT

Maximum Operating Junction Temperature, TJ

Storage Temperature Range

Lead Temperature (soldering, 10 seconds)

Note: Exceeding these ratings could cause damage to the device. All voltages are with respect to Ground.

Currents are positive into, negative out of the specified terminal.

50V

75V

150°C

-65°C to 150°C

260°C

Pin Name

OUT

OE

ISET

VDD

GND

PIN DESCRIPTION

Pin Function

Output pin. Sink current is decided by the current on RSET connected to ISET.

IOUT = 500 × ISET.

Output stage enable control pin. High enable the OUT pin.

Output current set input. Connect a resistor from ISET to GND to set the LED bias current.

ISET = 1.2V/RSET.

Power supply.

Ground

THERMAL DATA

Thermal Resistance from Junction to Ambient, θ JA

Junction Temperature Calculation: TJ = TA + (PD × θ JA).

The θJA numbers are guidelines for the thermal performance of the device/pc-board system.

Connect the ground pin to ground using a large pad or ground plane for better heat dissipation.

All of the above assume no ambient airflow.

80 OC /W

Maximum Power Calculation:

PD(MAX)=

TJ(MAX) – TA(MAX)

θJA

TJ(OC):

Maximum recommended junction temperature

TA(OC):

Ambient temperature of the application

θJA(OC /W): Junction-to-Ambient temperature thermal resistance of the package, and other heat dissipating materials.

The maximum power dissipation for a single-output regulator is:

PD(MAX) = [(VIN(MAX) - VOUT(NOM))] × IOUT(NOM) + VIN(MAX) × IQ

Where:

Then

VOUT(NOM) = the nominal output voltage

IOUT(NOM) = the nominal output current, and

IQ = the quiescent current the regulator consumes at IOUT(MAX)

VIN(MAX) = the maximum input voltage

θJA = (+150 OC – TA)/PD

Copyright © 2007 ADDtek Corp.

2

DD032_B -- APRIL 2007

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