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參數(shù)資料
| 型號： | FAN5182 |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | Adjustable Output 1, 2, or 3-Phase Synchronous Buck Controller |
| 中文描述： | 可調(diào)輸出1，2或3相同步降壓控制器 |
| 文件頁數(shù)： | 2/18頁 |
| 文件大小： | 788K |
| 代理商： | FAN5182 |
2
www.fairchildsemi.com
FAN5182 Rev. 1.0.1
F
Pin Assignment
Pin Description
Pin #
Pin Name
Pin Description
1
VCC
Supply Voltage for the Device.
2
FBRTN
Feedback Return. Voltage error amplifier reference for remote sensing of the output voltage.
3
FB
Feedback Input. Error amplifier input for remote sensing of the output voltage. An external 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.
7
DELAY
Soft-Start Delay and Current Limit Latch-Off Delay Setting Input. An external resistor and capacitor
connected between this pin and GND set the soft-start ramp-up time and the overcurrent 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.
10
ILIMIT
Current Limit Setpoint/Enable Output. An external resistor connected from this pin to GND sets the
current limit threshold of the converter. This pin is actively pulled low when the FAN5182 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 cur-
rent sense amplifier. This pin should be connected 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 together 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 the logic output signals of the device are referenced to this ground.
15–17
SW3 To SW1
Current Balance Inputs. These are inputs for measuring the current level in each phase. The SW pins
of unused phases should be left open.
18–20
PWM3 To PWM1
Logic-Level PWM Outputs. Each output is connected to the input of an external MOSFET driver such
as the FAN5009. Connecting the PWM3 output to GND causes that phase to turn off, allowing the
FAN5182 to operate as a 1- or 2-phase controller.
FAN5182
VCC
FBRTN
FB
COMP
PWRGD
EN
DELAY
RT
RAMPADJ
ILIMIT
PWM1
PWM2
PWM3
SW1
SW2
SW3
GND
CSCOMP
CSSUM
CSREF
1
2
3
20
19
18
4
8
10
5
6
7
13
16
15
14
9
11
12
17
QSOP-20L
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