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FAN6520BMX Folha de dados(PDF) 2 Page - Fairchild Semiconductor

Nome de Peças FAN6520BMX
Descrição Electrónicos  Single Synchronous Buck PWM Controller
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Fabricante Electrônico  FAIRCHILD [Fairchild Semiconductor]
Página de início  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

FAN6520BMX Folha de dados(HTML) 2 Page - Fairchild Semiconductor

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FAN6520B Rev. 1.0.3
Pin Configuration
FAN6520BM 8-pin SOIC Package
Pin Definitions
Pin #
Pin Name
Pin Function Description
1
BOOT
Bootstrap Supply Input. Provides a boosted voltage to the high-side MOSFET driver.
Connect to bootstrap capacitor and diode as shown in Figure 1.
2
HDRV
High Side Gate Drive Output.
Connect to the gate of the high-side power MOSFET(s).
This pin is also monitored by the adaptive shoot-through protection circuitry to determine
when the upper MOSFET has turned off.
3
GND
Ground. The signal and power ground for the IC. Tie this pin to the ground island/plane
through the lowest impedance connection available. Connect directly to source of low-side
MOSFET(s).
4
LDRV
Low Side Gate Drive Output. Connect to the gate of the low-side power MOSFET(s).
This pin is also monitored by the adaptive shoot-through protection circuitry to determine
when the lower MOSFET has turned off.
5
VCC
VCC. Provides bias power to the IC and the drive voltage for LDRV. Bypass with a good
quality ceramic capacitor (X7R or X5R) as close to this pin as possible.
6FB
Feedback. This pin is the inverting input of the internal error amplifier. Use this pin, in
combination with the COMP pin, to compensate the voltage-control feedback loop of the
converter.
7
COMP/SD
COMP/SD. This is a multiplexed pin. During operation, the output of the error amplifier
drives this pin. Pulling COMP to a level below 0.8V disables the controller. Disabling the
controller causes the oscillator to stop, the HDRV and LDRV outputs to be held low, and the
soft-start circuitry to re-arm. Connect a 75k
Ω resistor between VCC and COMP/SD pin to
pull up.
8SW
Switch Node Input. Connect as shown in Figure 1. The SW pin provides return for the
high-side bootstrapped driver, is a sense point for the adaptive shoot-thru protection.
FAN6520B
1
2
3
4
8
7
6
5
SW
COMP/SD
FB
VCC
BOOT
HDRV
GND
LDRV


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