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FAN6520A 数据表(PDF) 1 Page - Fairchild Semiconductor

部件名 FAN6520A
功能描述  Single Synchronous Buck PWM Controller
Download  15 Pages
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制造商  FAIRCHILD [Fairchild Semiconductor]
网页  http://www.fairchildsemi.com
标志 FAIRCHILD - Fairchild Semiconductor

FAN6520A 数据表(HTML) 1 Page - Fairchild Semiconductor

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REV. 1.0.2 8/26/04
Features
• Output Range 0.8V to VIN
– 0.8V Internal Reference
– ±1.5% Over Line Voltage and Temperature
• Drives N-Channel MOSFETs
• Simple Single-Loop Control Design
–Voltage-Mode PWM Control
•Fast Transient Response
– High-Bandwidth Error Amplifier
– Full 0% to 100% Duty Cycle
• Lossless, Programmable Over-current Protection
– Uses Upper MOSFET’s RDS(ON)
• Small Converter Size
– 300kHz Fixed Frequency Oscillator
– Internal Soft-Start
– 8-Lead SOIC
Applications
•Power Supplies for PC Subsystems and Peripherals
• MCH, GTL, and AGP Supplies
• Cable Modems, Set Top Boxes, and DSL Modems
• DSP, Memory
•Low-Voltage Distributed Power Supplies
General Description
The FAN6520A makes simple work out of implementing
a complete control and protection scheme for a DC-DC
stepdown converter.
Designed to drive N-channel MOSFETs in a synchronous
buck topology, the FAN6520A integrates the control, output
adjustment, monitoring and protection functions into a single
8-lead package.
The FAN6520A is easy to use, employs a single feedback
loop, and voltage-mode control with fast transient response.
The output voltage can be precisely regulated to as low as
0.8V, with a maximum tolerance of ±1.5% over temperature
and line voltage variations. A fixed frequency oscillator
reduces design complexity, while balancing typical
application cost. The error amplifier features a 15MHz gain-
bandwidth product and an 8V/µs slew rate which enables
high converter bandwidth for fast transient performance.
The resulting PWM duty cycles range from 0% to 100%.
The IC monitors the drop across the upper MOSFET and
inhibits PWM operation appropriately to protect against
over-current conditions. This approach simplifies the
implementation and improves efficiency by eliminating
the need for a current sense resistor.
The FAN6520A is rated for operation from 0° to +70°C with
the FAN6520AI rated from –40° to +85°C.
FAN6520A
Single Synchronous Buck PWM Controller


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