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Fairchild FAN6791 RD

文章出处:8gled.com作者:格烁光电发表时间:2018-07-23
代孕网-护理频道LzTA【100%包成功退全款】Fairchild 公司的FAN6791 / FAN6793是高度集成双PWM组合控制器,具有高压起动,低工作电流。FAN6791/3集成的频率抖动功能降低了EMI,内置的斜率补偿可得到稳定温州代孕-【宝宝在等你0K04】早教频道的峰值电流模式控制。主要用在开关电源和反激电源转换器,包括PC-ATX电源。本文介绍了FAN6791 / FAN6793主要特性,功能方框图,典型应用电路图,参考电路图及其材料清单(BOM),以及参考设计RD-343主要特性,电路图和所用变压器特性与电路。

FAN6791 / FAN6793 Highly Integrated, Dual-PWM Combination Controller

The highly integrated FAN6791/3 dual PWM combination controller provides several features to enhance the performance of converters.

To minimize standby power consumption, a proprietary green-mode function provides off-time modulation to linearly decrease the switching frequency at light-load conditions. To avoid acoustic-noise problems, the minimum PWM frequency is set above 20kHz. This green-mode function enables the power supply to meet international power conservation requirements. With the internal high-voltage startup circuitry, the power loss due to bleeding resistors is also ELiminated. To further reduce power consumption, FAN6791/3 is manufactured using the CMOS process, which allows an operating current of only 6mA. FAN6791/3 integrates a frequency-jittering function internally to reduce EMI emissions of a power supply with minimum line filters. The built-in synchronized slope compensation achieves stable peak-current-mode control. The proprietary internal line compensation ensures constant output power limit.

FAN6791/3 provides many protection functions, including brownout protection, cycle-by-cycle current limiting, and an internal open-loop protection circuit to ensure safety should an open-loop or output shortcircuit failure occur. PWM output is disabled until VDD drops below the UVLO lower limit when the controller restarts. As long as VDD exceeds ~24.5V, the internal OVP circuit is triggered.

FAN6791 / FAN6793主要特性:

High-Voltage Startup

Low Operating Current

Interleaved Stand-by PWM / Forward PWM Switching

Green Mode Stand-by PWM / Forward PWM

Linearly Decreasing Stand-by PWM Frequency to 20kHz

Remote On / Off

AC Brownout Protection

Forward PWM with Soft-Start

Frequency Hopping to Reduce EMI Emissions

Cycle-by-Cycle Current Limiting for Stand-by PWM /Forward PWM

Leading-Edge Blanking for Stand-by PWM / Forward PWM

Synchronized Slope Compensation for Stand-by PWM / Forward PWM

GATE Output Maximum Voltage Clamp

VDD Over-Voltage Protection (OVP)

VDD Under-Voltage Lockout (UVLO)

Internal Open-Loop Protection for Stand-by PWM /Forward PWM

Constant Power Limit for Stand-by PWM / Forward PWM

FAN6791 / FAN6793应用:

General-purpose switch-mode power supplies and flyback power converters, including:
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PC-ATX Power Supplies

图1。FAN6791 / FAN6793功能方框图

图2。FAN6791 / FAN6793典型应用电路图

图3。FAN6791 / FAN6793参考电路图
材料清单(BOM):

参考设计RD-343

参考设计RD-343主要特性:

FAN6791

High-Voltage Startup

Low Operating Current

Interleaved Standby PWM / Forward PWM Switching

Green Mode Standby PWM / Forward PWM

Linearly Decreasing Standby PWM Frequency to 20kHz

Remote On / Off

AC Brownout Protection

Forward PWM with Soft-Start

Frequency Hopping to Reduce EMI Emissions

Cycle-by-Cycle Current Limiting for Standby PWM / Forward PWM

Leading-Edge Blanking for Standby PWM / Forward PWM

Synchronized Slope Compensation for Standby PWM / Forward PWM

GATE Output Maximum Voltage Clamp

VDD Over-Voltage Protection (OVP)

VDD Under-Voltage Lockout (UVLO)

Internal Open-Loop Protection for Standby PWM / Forward PWM

Constant Power Limit for Standby PWM / Forward PWM

SG6521

Two 12V Sense-Input Pins: VS12 and VS12B

Over-Voltage Protection (OVP), Over-Current Protection (OCP), and Under-Voltage Protection (UVP) for 3.3V, 5V, and Two 12V

Open-Drain Output for PGO and FPO Pins

300ms Power-Good Delay

300ms Turn-On Delay for 3.3V, 5V, and Two 12V

2.8ms PSON Control to FPO Turn-Off Delay and 48ms PSON Control Delay

No Lockup During the Fast AC Power On / Off

Wide Supply Voltage Range: 4.2V to 15V

Additional Protection Input (Pext)


图4。参考设计RD-343电路图

变压器电路框图
变压器线绕指标:

反激转换器变压器(TX2)

变压器电路框图
变压器线绕指标:


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