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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发表时间：2020-04-21浏览次数：164

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

目录vCE嘉泰姆

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

一,产品概述(General Description) vCE嘉泰姆

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

1.)Operating with Single 5~12V Supply VoltagevCE嘉泰姆
2.)or Two Supply VoltagesvCE嘉泰姆
3.)Drive Dual Low Cost N-Channel MOSFETsvCE嘉泰姆
Adaptive Shoot-Through ProtectionvCE嘉泰姆
4.)Built-in Feedback CompensationvCE嘉泰姆
Voltage-Mode PWM ControlvCE嘉泰姆
0~100% Duty RatiovCE嘉泰姆
Fast Transient ResponsevCE嘉泰姆
5.)±2% 0.8V ReferencevCE嘉泰姆
Over Line, Load Regulation, and Operating vCE嘉泰姆
6.)Temperature Programmable Over-Current ProtectionvCE嘉泰姆
Using RDS(ON) of Low-Side MOSFETvCE嘉泰姆
7.)Hiccup-Mode Under-Voltage ProtectionvCE嘉泰姆
8.)118% Over-Voltage ProtectionvCE嘉泰姆
9.)Adjustable Output VoltagevCE嘉泰姆
10.)Small Converter SizevCE嘉泰姆
300kHz Constant Switching FrequencyvCE嘉泰姆
Small SOP-8 PackagevCE嘉泰姆
11.)Built-In Digital Soft-StartvCE嘉泰姆
12.)Shutdown Control Using an External MOSFETvCE嘉泰姆
13.)Lead Free and Green Devices AvailablevCE嘉泰姆
三,应用范围 (Applications)vCE嘉泰姆

MotherboardvCE嘉泰姆
Graphics CardvCE嘉泰姆
High Current, up to 20A, DC-DC ConvertersvCE嘉泰姆
四.下载产品资料PDF文档 vCE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！vCE嘉泰姆

QQ截图20160419174301.jpg vCE嘉泰姆

五,产品封装图 (Package)vCE嘉泰姆

vCE嘉泰姆

BOOT (Pin 1)vCE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.vCE嘉泰姆
UGATE (Pin 2)vCE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.vCE嘉泰姆
GND (Pin 3)vCE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.vCE嘉泰姆
LGATE (Pin 4)vCE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. vCE嘉泰姆
VCC (Pin 5)vCE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. vCE嘉泰姆
FB (Pin 6)vCE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 :vCE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. vCE嘉泰姆
OCSET (Pin 7)vCE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:vCE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.vCE嘉泰姆
PHASE (Pin 8) vCE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 sourcevCE嘉泰姆
六.电路原理图vCE嘉泰姆
vCE嘉泰姆
七,功能概述vCE嘉泰姆
Power-On-Reset (POR) vCE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. vCE嘉泰姆
Soft-StartvCE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-vCE嘉泰姆
ence voltage. The soft-start interval is about 3.2mstypical, independent of the converter’s input and out-put voltages.vCE嘉泰姆
Over-Current Protection (OCP)vCE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 thevCE嘉泰姆
Over-Current Protection (OCP) (Cont.)vCE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 vCE嘉泰姆

八,相关产品 更多同类产品...... vCE嘉泰姆

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Part_No vCE嘉泰姆	Package vCE嘉泰姆	ArchivCE嘉泰姆 tectuvCE嘉泰姆	PhasevCE嘉泰姆	No.ofvCE嘉泰姆 PWMvCE嘉泰姆 OutputvCE嘉泰姆	Output vCE嘉泰姆 CurrentvCE嘉泰姆 (A) vCE嘉泰姆	InputvCE嘉泰姆 Voltage (V) vCE嘉泰姆		ReferencevCE嘉泰姆 VoltagevCE嘉泰姆 (V) vCE嘉泰姆	Bias vCE嘉泰姆 VoltagevCE嘉泰姆 (V) vCE嘉泰姆	QuiescentvCE嘉泰姆 CurrentvCE嘉泰姆 (uA) vCE嘉泰姆
Part_No vCE嘉泰姆	Package vCE嘉泰姆	ArchivCE嘉泰姆 tectuvCE嘉泰姆	PhasevCE嘉泰姆	No.ofvCE嘉泰姆 PWMvCE嘉泰姆 OutputvCE嘉泰姆	Output vCE嘉泰姆 CurrentvCE嘉泰姆 (A) vCE嘉泰姆	minvCE嘉泰姆	maxvCE嘉泰姆	ReferencevCE嘉泰姆 VoltagevCE嘉泰姆 (V) vCE嘉泰姆	Bias vCE嘉泰姆 VoltagevCE嘉泰姆 (V) vCE嘉泰姆	QuiescentvCE嘉泰姆 CurrentvCE嘉泰姆 (uA) vCE嘉泰姆
CXSD6273vCE嘉泰姆	SOP-14vCE嘉泰姆 QSOP-16vCE嘉泰姆 QFN4x4-16vCE嘉泰姆	VM vCE嘉泰姆	1 vCE嘉泰姆	1 vCE嘉泰姆	30vCE嘉泰姆	2.9 vCE嘉泰姆	13.2vCE嘉泰姆	0.9vCE嘉泰姆	12 vCE嘉泰姆	8000vCE嘉泰姆
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CXSD6274CvCE嘉泰姆	SOP-8vCE嘉泰姆	VMvCE嘉泰姆	1vCE嘉泰姆	1vCE嘉泰姆	20vCE嘉泰姆	2.9vCE嘉泰姆	13.2vCE嘉泰姆	0.8vCE嘉泰姆	12vCE嘉泰姆	5000vCE嘉泰姆
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CXSD6276vCE嘉泰姆	SOP-8vCE嘉泰姆	VMvCE嘉泰姆	1vCE嘉泰姆	1vCE嘉泰姆	20vCE嘉泰姆	2.2vCE嘉泰姆	13.2vCE嘉泰姆	0.8vCE嘉泰姆	5~12vCE嘉泰姆	2100vCE嘉泰姆
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CXSD6277/A/BvCE嘉泰姆	SOP8\|TSSOP8vCE嘉泰姆	VMvCE嘉泰姆	1vCE嘉泰姆	1vCE嘉泰姆	5vCE嘉泰姆	5vCE嘉泰姆	13.2vCE嘉泰姆	1.25\|0.8vCE嘉泰姆	5~12vCE嘉泰姆	3000vCE嘉泰姆
CXSD6278vCE嘉泰姆	SOP-8vCE嘉泰姆	VMvCE嘉泰姆	1vCE嘉泰姆	1vCE嘉泰姆	10vCE嘉泰姆	3.3vCE嘉泰姆	5.5vCE嘉泰姆	0.8vCE嘉泰姆	5vCE嘉泰姆	2100vCE嘉泰姆
CXSD6279BvCE嘉泰姆	SOP-14vCE嘉泰姆	VM vCE嘉泰姆	1vCE嘉泰姆	1vCE嘉泰姆	10vCE嘉泰姆	5vCE嘉泰姆	13.2vCE嘉泰姆	0.8vCE嘉泰姆	12vCE嘉泰姆	2000vCE嘉泰姆
CXSD6280vCE嘉泰姆	TSSOP-24vCE嘉泰姆 \|QFN5x5-32vCE嘉泰姆	VMvCE嘉泰姆	1vCE嘉泰姆	2vCE嘉泰姆	20vCE嘉泰姆	5vCE嘉泰姆	13.2vCE嘉泰姆	0.6vCE嘉泰姆	5~12vCE嘉泰姆	4000vCE嘉泰姆
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CXSD6287vCE嘉泰姆	SOP-8-P\|DIP-8vCE嘉泰姆	VMvCE嘉泰姆	1vCE嘉泰姆	1vCE嘉泰姆	30vCE嘉泰姆	2.9vCE嘉泰姆	13.2vCE嘉泰姆	1.2vCE嘉泰姆	12vCE嘉泰姆	3000vCE嘉泰姆
CXSD6288vCE嘉泰姆	SSOP28vCE嘉泰姆 QFN4x4-24vCE嘉泰姆	VMvCE嘉泰姆	1vCE嘉泰姆	2vCE嘉泰姆	20vCE嘉泰姆	5vCE嘉泰姆	24vCE嘉泰姆	0.9vCE嘉泰姆

上一篇：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

下一篇：双N通道mosfetCXSD6277/A/B车载直流-直流转换器低成本的同步降压调节器VCC和VC电源的上电复位POR外部可编程软启动检测到输出短路时锁定设备的电压检测

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