AMC3202DMF datasheet(3/11 Pages) ADDTEK

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AMC3202

DD074_B -- AUGUST 2006

PIN DESCRIPTION

Number

Pin Name

Pin Function

COMP

Loop compensation pin. This pin is the output of the error amplifier and is used for loop

compensation. Loop compensation can be implemented by a simple RC network.

Feedback pin. Sense the output voltage and referenced to 1.276V. When the voltage at this

pin falls below 0.4V, chip switching-frequency reduces to a much lower frequency.

Soft Start pin. Left this pin floating if soft start function is not used.

Enable pin. A TTL low will shut down the chip and high enable the chip. This pin may

also be used to synchronize the part to nearly twice the base frequency. If synchronization

is not used, this pin should be either tied high or left floating for normal operation.

VCC

Input power supply pin. Supply power to the IC and should have a bypass capacitor

connected to AGND.

AGND

Analog ground. Provide a clean ground for the controller circuitry and should not be in

the path of large currents. This pin is connected to the IC substrate.

PGND

Power ground. This pin is the ground connection for the emitter of the power switching

transistor. Connection to a good ground plane is essential.

VSW

High current switch pin. Connect to the collector of the internal power switch. The open

voltage across the power switch can be as high as 40V. To minimize radiation, use a trace

as short as practical.

Exposed

Pad

Heat Pad

(PGND)

Heat pad. Connect to power ground. Must be soldered to electrical ground on PCB.

THERMAL DATA

Thermal Resistance from Junction to Ambient,

θ JA

165

°C /W

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

The

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.

Maximum Power Calculation:

TJ(MAX) – TA(MAX)

PD(MAX)=

θJA

TJ (

°C):

Maximum recommended junction temperature

TA(

°C):

Ambient temperature of the application

θJA(

°OC /W): Junction-to-Ambient 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: V

OUT(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

Then

JA = (+150

C – TA)/PD

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