CXSD6276是固定的300kHz频率电压模式和同步PWM控制器两个低成本N通道mosfet设计为单电源5~12V或双电源工作电压为负载瞬变提供良好的调节

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发表时间：2020-04-21浏览次数：225

CXSD6276是固定的300kHz频率电压模式和同步PWM控制器两个低成本N通道mosfet设计为单电源5~12V或双电源工作电压为负载瞬变提供良好的调节

目录0Li嘉泰姆

1.产品概述         2.产品特点0Li嘉泰姆
3.应用范围       4.下载产品资料PDF文档 0Li嘉泰姆
5.产品封装图                     6.电路原理图             0Li嘉泰姆
7.功能概述       8.相关产品0Li嘉泰姆

一,产品概述(General Description) 0Li嘉泰姆

The CXSD6276 CXSD6276A is a fixed 300kHz frequency, voltage mode, and0Li嘉泰姆
synchronous PWM controller. The device drives two low cost N-channel0Li嘉泰姆
MOSFETs and is de-signed to work with single 5~12V or two supply0Li嘉泰姆
voltage(s), providing excellent regulation for load transients.0Li嘉泰姆
The CXSD6276 CXSD6276A integrates controls, monitoring, and protection functions0Li嘉泰姆
into a single 8-pin package to provide a low cost and perfect power solution.0Li嘉泰姆
A power-on-reset (POR) circuit monitors the VCC supply voltage to prevent0Li嘉泰姆
wrong logic controls. An internal 0.8V reference provides low output voltage0Li嘉泰姆
down to 0.8V for further applications. An built-in digital soft-start with fixed0Li嘉泰姆
soft-start interval prevents the output voltage from overshoot as well as limits0Li嘉泰姆
the input current. The controller’s over-current protection monitors the output0Li嘉泰姆
current by using the voltage drop across the low-side MOSFET’s RDS(ON),0Li嘉泰姆
eliminating the need of a current sensing resistor. Additional under voltage and0Li嘉泰姆
over voltage protections monitor the voltage on FB pin for short-circuit and0Li嘉泰姆
over-voltage protections. The over-current protection cycles the soft-start0Li嘉泰姆
function until 4 over-current events are counted.Pulling and holding the voltage0Li嘉泰姆
on OCSET pin below 0.15V with an open drain device shuts down the controller.0Li嘉泰姆
二.产品特点(Features)0Li嘉泰姆

1.)Operating with Single 5~12V Supply Voltage0Li嘉泰姆
2.)or Two Supply Voltages0Li嘉泰姆
3.)Drive Dual Low Cost N-Channel MOSFETs0Li嘉泰姆
Adaptive Shoot-Through Protection0Li嘉泰姆
4.)Built-in Feedback Compensation0Li嘉泰姆
Voltage-Mode PWM Control0Li嘉泰姆
0~100% Duty Ratio0Li嘉泰姆
Fast Transient Response0Li嘉泰姆
5.)±2% 0.8V Reference0Li嘉泰姆
Over Line, Load Regulation, and Operating 0Li嘉泰姆
6.)Temperature Programmable Over-Current Protection0Li嘉泰姆
Using RDS(ON) of Low-Side MOSFET0Li嘉泰姆
7.)Hiccup-Mode Under-Voltage Protection0Li嘉泰姆
8.)118% Over-Voltage Protection0Li嘉泰姆
9.)Adjustable Output Voltage0Li嘉泰姆
10.)Small Converter Size0Li嘉泰姆
300kHz Constant Switching Frequency0Li嘉泰姆
Small SOP-8 Package0Li嘉泰姆
11.)Built-In Digital Soft-Start0Li嘉泰姆
12.)Shutdown Control Using an External MOSFET0Li嘉泰姆
13.)Lead Free and Green Devices Available0Li嘉泰姆
三,应用范围 (Applications)0Li嘉泰姆

Motherboard0Li嘉泰姆
Graphics Card0Li嘉泰姆
High Current, up to 20A, DC-DC Converters0Li嘉泰姆
四.下载产品资料PDF文档 0Li嘉泰姆

需要详细的PDF规格书请扫一扫微信联系我们，还可以获得免费样品以及技术支持！0Li嘉泰姆

QQ截图20160419174301.jpg 0Li嘉泰姆

五,产品封装图 (Package)0Li嘉泰姆

0Li嘉泰姆

BOOT (Pin 1)0Li嘉泰姆

This pin provides ground referenced bias voltage to the high-side MOSFET driver. A bootstrap circuit with a diode connected to 5~12V is used to create a voltage suitable to drive a logic-level N-channel MOSFET.0Li嘉泰姆
UGATE (Pin 2)0Li嘉泰姆
Connect this pin to the high-side N-channel MOSFET’s gate. This pin provides gate drive for the high-side MOSFET.0Li嘉泰姆
GND (Pin 3)0Li嘉泰姆
The GND terminal provides return path for the IC’s biascurrent and the low-side MOSFET driver’s pull-low current. Connect the pin to the system ground via very low impedance layout on PCBs.0Li嘉泰姆
LGATE (Pin 4)0Li嘉泰姆
Connect this pin to the low-side N-channel MOSFET’s gate. This pin provides gate drive for the low-side MOSFET. 0Li嘉泰姆
VCC (Pin 5)0Li嘉泰姆
Connect this pin to a 5~12V supply voltage. This pin provides bias supply for the control circuitry and the low-side MOSFET driver. The voltage at this pin is monitored for the Power-On-Reset (POR) purpose. 0Li嘉泰姆
FB (Pin 6)0Li嘉泰姆
This pin is the inverting input of the internal Gm amplifier.Connect this pin to the output (VOUT) of the converter via an external resistor divider for closed-loop operation.The output voltage set by the resistor divider is deter-mined using the following formula :0Li嘉泰姆
where R1 is the resistor connected from VOUT to FB ,and R2 is the resistor connected from FB to GND. The FB pin is also monitored for under and over-voltage events. 0Li嘉泰姆
OCSET (Pin 7)0Li嘉泰姆
The OCSET is a dual-function input pin for over-current protection and shutdown control. Connect a resistor (ROCSET) from this pin to the Drain of the low-side MOSFET. This resistor, an internal 40μA current source (IOCSET), and the MOSFET’s on-resistance(RDSON) set the converter over-current trip level (IPEAK) according to the following formula:0Li嘉泰姆
Pulling and holding this pin below 0.15V with an open drain device, with very low parasitic capacitor, shuts down the IC with floating output and also resets the over-current counter. Releasing OCSET pin initiates a new soft-start and the converter works again.0Li嘉泰姆
PHASE (Pin 8) 0Li嘉泰姆
The pin provides return path for the high-side MOSFETdriver’s pull-low current. Connect this pin to the high-side MOSFET’s source0Li嘉泰姆
六.电路原理图0Li嘉泰姆
0Li嘉泰姆
七,功能概述0Li嘉泰姆
Power-On-Reset (POR) 0Li嘉泰姆
The CXSD6276 monitors the VCC voltage (V CC) for Power-On-Reset function, preventing wrong logic operation during powering on. When the VCC voltage is ready, the CXSD6276 starts a start-up process and then ramps the output voltage up to the target voltage. 0Li嘉泰姆
Soft-Start0Li嘉泰姆
The CXSD6276 has a built-in digital soft-start to control the output voltage rise and limit the current surge at the start-up. During the soft-start, an internal ramp con-nected to the one of the positive inputs of the Gm amplifier rises up from 0V to 2V to replace the reference voltage (0.8V) until the ramp voltage reaches the refer-0Li嘉泰姆
ence voltage. The soft-start interval is about 3.2mstypical, independent of the converter’s input and out-put voltages.0Li嘉泰姆
Over-Current Protection (OCP)0Li嘉泰姆
The over-current function protects the switching c o nverter against over-current or short-circuit conditions. The controller senses the inductor current by detecting the drain-to-source voltage, product of the inductor’s current and the on-resistance, of the low-side MOSFET during it’s on-state. This method enhances the converter’s efficiency and reduces cost by eliminating a current sensing resistor.A resistor (ROCSET), connected from the OCSET to the0Li嘉泰姆
Over-Current Protection (OCP) (Cont.)0Li嘉泰姆
low-side MOSFET’s drain, programs the over-current trip level. An internal 40μA (typical) current source flowing through the ROCSET develops a voltage (VROCSET) across the ROCSET. When the VOCSET 0Li嘉泰姆

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CXSD6279B0Li嘉泰姆	SOP-140Li嘉泰姆	VM 0Li嘉泰姆	10Li嘉泰姆	10Li嘉泰姆	100Li嘉泰姆	50Li嘉泰姆	13.20Li嘉泰姆	0.80Li嘉泰姆	120Li嘉泰姆	20000Li嘉泰姆
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CXSD62820Li嘉泰姆	SOP-140Li嘉泰姆	VM0Li嘉泰姆	10Li嘉泰姆	10Li嘉泰姆	300Li嘉泰姆	2.20Li嘉泰姆	13.20Li嘉泰姆	0.60Li嘉泰姆	120Li嘉泰姆	50000Li嘉泰姆
CXSD6282A0Li嘉泰姆	SOP-140Li嘉泰姆	VM0Li嘉泰姆	10Li嘉泰姆	10Li嘉泰姆	300Li嘉泰姆	2.20Li嘉泰姆	13.20Li嘉泰姆	0.60Li嘉泰姆	120Li嘉泰姆	50000Li嘉泰姆
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上一篇：CXSD6275两相PWM控制芯片它为图形卡应用中的高级图形微处理器提供了一个精确的电压调节系统功率MOSFET驱动器

下一篇：CXSD6276A单电源电压5~12V两个电源电压驱动双低成本N通道mosfet自适应穿透保护内置反馈补偿电压型PWM控制 0~100%占空比快速瞬态响应

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