AMC7140 Datasheet, PDF (2/9 Pages) ADDtek Corp – 700mA HIGH VOLTAGE ADJUSTABLE CURRENT REGULATOR WITH ENABLE CONTROL

AMC7140
ABSOLUTE MAXIMUM RATINGS (Note)
Input Voltage, V_DD
Output Voltage, V_OUT
Maximum Operating Junction Temperature, T_J
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
I_SET
VDD
GND
PIN DESCRIPTION
Pin Function
Output pin. Sink current is decided by the current on R_SET connected to I_SET.
I_OUT = 500 × I_SET.
Output stage enable control pin. High enable the OUT pin.
Output current set input. Connect a resistor from I_SET to GND to set the LED bias current.
I_SET = 1.2V/R_SET.
Power supply.
Ground
THERMAL DATA
Thermal Resistance from Junction to Ambient, θ _JA
Junction Temperature Calculation: T_J = T_A + (P_D × θ _JA).
The θ_JA 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:
P_D(MAX)=
T_J(MAX) – T_A(MAX)
θ_JA
T_J(^OC):
Maximum recommended junction temperature
T_A(^OC):
Ambient temperature of the application
θ_JA(^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:
P_D(MAX) = [(V_IN(MAX) - V_OUT(NOM))] × I_OUT(NOM) + V_IN(MAX) × I_Q
Where:
Then
V_OUT(NOM) = the nominal output voltage
I_OUT(NOM) = the nominal output current, and
I_Q = the quiescent current the regulator consumes at I_OUT(MAX)
V_IN(MAX) = the maximum input voltage
θ_JA = (+150 ^OC – T_A)/P_D
Copyright © 2007 ADDtek Corp.
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DD032_B -- APRIL 2007