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：233

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zTn嘉泰姆

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

一,产品概述(General Description) zTn嘉泰姆

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

1.)Operating with Single 5~12V Supply VoltagezTn嘉泰姆
2.)or Two Supply VoltageszTn嘉泰姆
3.)Drive Dual Low Cost N-Channel MOSFETszTn嘉泰姆
Adaptive Shoot-Through ProtectionzTn嘉泰姆
4.)Built-in Feedback CompensationzTn嘉泰姆
Voltage-Mode PWM ControlzTn嘉泰姆
0~100% Duty RatiozTn嘉泰姆
Fast Transient ResponsezTn嘉泰姆
5.)±2% 0.8V ReferencezTn嘉泰姆
Over Line, Load Regulation, and Operating zTn嘉泰姆
6.)Temperature Programmable Over-Current ProtectionzTn嘉泰姆
Using RDS(ON) of Low-Side MOSFETzTn嘉泰姆
7.)Hiccup-Mode Under-Voltage ProtectionzTn嘉泰姆
8.)118% Over-Voltage ProtectionzTn嘉泰姆
9.)Adjustable Output VoltagezTn嘉泰姆
10.)Small Converter SizezTn嘉泰姆
300kHz Constant Switching FrequencyzTn嘉泰姆
Small SOP-8 PackagezTn嘉泰姆
11.)Built-In Digital Soft-StartzTn嘉泰姆
12.)Shutdown Control Using an External MOSFETzTn嘉泰姆
13.)Lead Free and Green Devices AvailablezTn嘉泰姆
三,应用范围 (Applications)zTn嘉泰姆

MotherboardzTn嘉泰姆
Graphics CardzTn嘉泰姆
High Current, up to 20A, DC-DC ConverterszTn嘉泰姆
四.下载产品资料PDF文档 zTn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！zTn嘉泰姆

QQ截图20160419174301.jpg zTn嘉泰姆

五,产品封装图 (Package)zTn嘉泰姆

zTn嘉泰姆

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

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Part_No zTn嘉泰姆	Package zTn嘉泰姆	ArchizTn嘉泰姆 tectuzTn嘉泰姆	PhasezTn嘉泰姆	No.ofzTn嘉泰姆 PWMzTn嘉泰姆 OutputzTn嘉泰姆	Output zTn嘉泰姆 CurrentzTn嘉泰姆 (A) zTn嘉泰姆	minzTn嘉泰姆	maxzTn嘉泰姆	ReferencezTn嘉泰姆 VoltagezTn嘉泰姆 (V) zTn嘉泰姆	Bias zTn嘉泰姆 VoltagezTn嘉泰姆 (V) zTn嘉泰姆	QuiescentzTn嘉泰姆 CurrentzTn嘉泰姆 (uA) zTn嘉泰姆
CXSD6273zTn嘉泰姆	SOP-14zTn嘉泰姆 QSOP-16zTn嘉泰姆 QFN4x4-16zTn嘉泰姆	VM zTn嘉泰姆	1 zTn嘉泰姆	1 zTn嘉泰姆	30zTn嘉泰姆	2.9 zTn嘉泰姆	13.2zTn嘉泰姆	0.9zTn嘉泰姆	12 zTn嘉泰姆	8000zTn嘉泰姆
CXSD6274zTn嘉泰姆	SOP-8zTn嘉泰姆	VM zTn嘉泰姆	1zTn嘉泰姆	1zTn嘉泰姆	20zTn嘉泰姆	2.9 zTn嘉泰姆	13.2 zTn嘉泰姆	0.8zTn嘉泰姆	12zTn嘉泰姆	5000zTn嘉泰姆
CXSD6274CzTn嘉泰姆	SOP-8zTn嘉泰姆	VMzTn嘉泰姆	1zTn嘉泰姆	1zTn嘉泰姆	20zTn嘉泰姆	2.9zTn嘉泰姆	13.2zTn嘉泰姆	0.8zTn嘉泰姆	12zTn嘉泰姆	5000zTn嘉泰姆
CXSD6275zTn嘉泰姆	QFN4x4-24zTn嘉泰姆	VMzTn嘉泰姆	2zTn嘉泰姆	1zTn嘉泰姆	60zTn嘉泰姆	3.1zTn嘉泰姆	13.2zTn嘉泰姆	0.6zTn嘉泰姆	12zTn嘉泰姆	5000zTn嘉泰姆
CXSD6276zTn嘉泰姆	SOP-8zTn嘉泰姆	VMzTn嘉泰姆	1zTn嘉泰姆	1zTn嘉泰姆	20zTn嘉泰姆	2.2zTn嘉泰姆	13.2zTn嘉泰姆	0.8zTn嘉泰姆	5~12zTn嘉泰姆	2100zTn嘉泰姆
CXSD6276AzTn嘉泰姆	SOP-8zTn嘉泰姆	VMzTn嘉泰姆	1zTn嘉泰姆	1zTn嘉泰姆	20zTn嘉泰姆	2.2zTn嘉泰姆	13.2zTn嘉泰姆	0.8zTn嘉泰姆	5~12zTn嘉泰姆	2100zTn嘉泰姆
CXSD6277/A/BzTn嘉泰姆	SOP8\|TSSOP8zTn嘉泰姆	VMzTn嘉泰姆	1zTn嘉泰姆	1zTn嘉泰姆	5zTn嘉泰姆	5zTn嘉泰姆	13.2zTn嘉泰姆	1.25\|0.8zTn嘉泰姆	5~12zTn嘉泰姆	3000zTn嘉泰姆
CXSD6278zTn嘉泰姆	SOP-8zTn嘉泰姆	VMzTn嘉泰姆	1zTn嘉泰姆	1zTn嘉泰姆	10zTn嘉泰姆	3.3zTn嘉泰姆	5.5zTn嘉泰姆	0.8zTn嘉泰姆	5zTn嘉泰姆	2100zTn嘉泰姆
CXSD6279BzTn嘉泰姆	SOP-14zTn嘉泰姆	VM zTn嘉泰姆	1zTn嘉泰姆	1zTn嘉泰姆	10zTn嘉泰姆	5zTn嘉泰姆	13.2zTn嘉泰姆	0.8zTn嘉泰姆	12zTn嘉泰姆	2000zTn嘉泰姆
CXSD6280zTn嘉泰姆	TSSOP-24zTn嘉泰姆 \|QFN5x5-32zTn嘉泰姆	VMzTn嘉泰姆	1zTn嘉泰姆	2zTn嘉泰姆	20zTn嘉泰姆	5zTn嘉泰姆	13.2zTn嘉泰姆	0.6zTn嘉泰姆	5~12zTn嘉泰姆	4000zTn嘉泰姆
CXSD6281NzTn嘉泰姆	SOP14zTn嘉泰姆 QSOP16zTn嘉泰姆 QFN-16zTn嘉泰姆	VMzTn嘉泰姆	1zTn嘉泰姆	1zTn嘉泰姆	30zTn嘉泰姆	2.9zTn嘉泰姆	13.2zTn嘉泰姆	0.9zTn嘉泰姆	12zTn嘉泰姆	4000zTn嘉泰姆
CXSD6282zTn嘉泰姆	SOP-14zTn嘉泰姆	VMzTn嘉泰姆	1zTn嘉泰姆	1zTn嘉泰姆	30zTn嘉泰姆	2.2zTn嘉泰姆	13.2zTn嘉泰姆	0.6zTn嘉泰姆	12zTn嘉泰姆	5000zTn嘉泰姆
CXSD6282AzTn嘉泰姆	SOP-14zTn嘉泰姆	VMzTn嘉泰姆	1zTn嘉泰姆	1zTn嘉泰姆	30zTn嘉泰姆	2.2zTn嘉泰姆	13.2zTn嘉泰姆	0.6zTn嘉泰姆	12zTn嘉泰姆	5000zTn嘉泰姆
CXSD6283zTn嘉泰姆	SOP-14zTn嘉泰姆	VMzTn嘉泰姆	1zTn嘉泰姆	1zTn嘉泰姆	25zTn嘉泰姆	2.2zTn嘉泰姆	13.2zTn嘉泰姆	0.8zTn嘉泰姆	12zTn嘉泰姆	5000zTn嘉泰姆
CXSD6284/AzTn嘉泰姆	LQFP7x7 48zTn嘉泰姆 TQFN7x7-48zTn嘉泰姆	VMzTn嘉泰姆	1zTn嘉泰姆	6zTn嘉泰姆	0.015zTn嘉泰姆	1.4zTn嘉泰姆	6.5zTn嘉泰姆	-zTn嘉泰姆	5zTn嘉泰姆	1800zTn嘉泰姆
CXSD6285zTn嘉泰姆	TSSOP-24PzTn嘉泰姆	VMzTn嘉泰姆	1zTn嘉泰姆	2zTn嘉泰姆	20zTn嘉泰姆	2.97zTn嘉泰姆	5.5zTn嘉泰姆	0.8zTn嘉泰姆	5~12zTn嘉泰姆	5000zTn嘉泰姆
CXSD6286zTn嘉泰姆	SOP-14zTn嘉泰姆	VMzTn嘉泰姆	1zTn嘉泰姆	1zTn嘉泰姆	10zTn嘉泰姆	5zTn嘉泰姆	13.2zTn嘉泰姆	0.8zTn嘉泰姆	12zTn嘉泰姆	3000zTn嘉泰姆
CXSD6287zTn嘉泰姆	SOP-8-P\|DIP-8zTn嘉泰姆	VMzTn嘉泰姆	1zTn嘉泰姆	1zTn嘉泰姆	30zTn嘉泰姆	2.9zTn嘉泰姆	13.2zTn嘉泰姆	1.2zTn嘉泰姆	12zTn嘉泰姆	3000zTn嘉泰姆
CXSD6288zTn嘉泰姆	SSOP28zTn嘉泰姆 QFN4x4-24zTn嘉泰姆	VMzTn嘉泰姆	1zTn嘉泰姆	2zTn嘉泰姆	20zTn嘉泰姆	5zTn嘉泰姆	24zTn嘉泰姆	0.9zTn嘉泰姆

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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