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AMC3202DMF Fiches technique(PDF) 3 Page - ADDtek Corp |
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AMC3202DMF Fiches technique(HTML) 3 Page - ADDtek Corp |
3 / 11 page AMC3202 Copyright © 2006 ADDtek Corp. 3 DD074_B -- AUGUST 2006 PIN DESCRIPTION Pin Number Pin Name Pin Function 1 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. 2 FB 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. 3 SS Soft Start pin. Left this pin floating if soft start function is not used. 4 EN 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. 5 VCC Input power supply pin. Supply power to the IC and should have a bypass capacitor connected to AGND. 6 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. 7 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. 8 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 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. 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 θ JA = (+150 O C – TA)/PD |
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