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FAN6520AIMX Folha de dados(PDF) 2 Page - Fairchild Semiconductor

Nome de Peças FAN6520AIMX
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

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© 2005 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FAN6520A Rev. 1.0.5
2
Pin Configuration
FAN6520AM 8-Pin SOIC Package
Pin Definitions
Pin #
Name
Description
1
BOOT
Bootstrap Supply Input. Provides a boosted voltage to the high-side MOSFET driver.
Connect to bootstrap capacitor, 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 monitored by the adaptive shoot-through protection circuitry to determine when
the upper MOSFET has turned off.
3GND
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).
4LDRV
Low-Side Gate-Drive Output. Connect to the gate of the low-side power MOSFET(s).
This pin is monitored by the adaptive shoot-through protection circuitry to determine when
the lower MOSFET has turned off.
5VCC
VCC. Provides bias power to the IC and the drive voltage for LDRV. Bypass with a ceramic
capacitor as close to this pin as possible.
6FB
Feedback. This pin is the inverting input of the internal error amplifier. Use this pin, in com-
bination with the COMP/OCSET pin, to compensate the voltage-control feedback loop of
the converter.
7COMP/
OCSET/SD
Compensation / Over-Current Set Point / Shut Down. This is a multiplexed pin. During
operation, the output of the error amplifier drives this pin. During a short period of time fol-
lowing power-on reset (POR), this pin is used to determine the over-current threshold of the
converter. Pulling COMP/OCSET 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 restart.
8SW
Switch Node Input. The SW pin provides return for the high-side bootstrapped driver, is a
sense point for the adaptive shoot-through protection, and is used to monitor the drop
across the upper MOSFET’s RDS(ON) for current limit. Connect as shown in Figure 1.
FAN6520A
1
2
3
4
8
7
6
5
SW
COMP/OCSET/SD
FB
VCC
BOOT
HDRV
GND
LDRV


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