FAN5182QSCX_NA3E229_NL(2007) 데이터 시트보기 (PDF) - Fairchild Semiconductor

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FAN5182QSCX_NA3E229_NL
(Rev.:2007)

Adjustable Output, 1-, 2-, or 3-Phase Synchronous Buck Controller

Fairchild Semiconductor 

Pin Assignments

Figure 2. Pin Assignments

Pin Definitions

Pin # Name

Description

1

VCC

Supply Voltage for the Device.

2

FBRTN Feedback Return. Voltage error amplifier reference for remote sensing of the output voltage.

Feedback Input. Error amplifier input for remote sensing of the output voltage. An external

3

FB

resistor divider between the output and FBRTN connected to this pin sets the output voltage.

This pin is also the reference point for the power-good and crowbar comparators.

4

COMP Error Amplifier Output and Compensation Pin.

5

PWRGD

Power Good Output. Open-drain output that signals when the output voltage is outside the

proper operating range.

6

EN

Power Supply Enable Input. Pulling this pin to GND disables the PWM outputs and pulls the

PWRGD output low.

Soft-Start Delay and Current Limit Latch-Off Delay Setting Input. An external resistor and

7

DELAY capacitor connected between this pin and GND sets the soft-start ramp-up time and the over-

current latch-off delay time.

8

RT

Frequency Setting Resistor Input. An external resistor connected between this pin and GND

sets the oscillator frequency of the device.

9

RAMPADJ

PWM Ramp Current Input. An external resistor from the converter input voltage to this pin

sets the internal PWM ramp.

Current-Limit Set point / Enable Output. An external resistor connected from this pin to GND

10

ILIMIT

sets the current limit threshold of the converter. This pin is actively pulled low when the EN

input is low, or when VCC is below its UVLO threshold, to signal to the driver IC that the driver

high-side and low-side outputs should go low.

11

CSREF

Current-Sense Reference Voltage Input. The voltage on this pin is used as the reference for

the current-sense amplifier. Connect this pin to the common point of the output inductors.

12

CSSUM

Current-Sense Summing Node. External resistors from each switch node to this pin sum the

average inductor currents to measure the total output current.

13

CSCOMP

Current-Sense Compensation Point. A resistor and a capacitor from this pin to CSSUM

determine the gain of the current sense amplifier.

14

GND

Ground. All internal biasing and logic output signals are referenced to this ground.

15–17 SW3 - SW1

Current Balance Inputs. These are inputs for measuring the current level in each phase. The

SW pins of unused phases should be connected to ground.

Logic-Level PWM Outputs. Each output is connected to the input of an external MOSFET

18–20 PWM3 -

PWM1

driver, such as the FAN5109. Connecting the PWM3 output to GND causes that phase to turn

off, allowing the FAN5182 to operate as a 1- or 2-phase controller. Do not connect PWM2 to

ground for 1-phase operation.

© 2005 Fairchild Semiconductor Corporation

FAN5182 Rev. 1.1.1

3

www.fairchildsemi.com

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