CXSD6276A

CXSD6276A控制器的过电流保护监视输出
通过使用低压侧MOSFET的RDS(ON)上的电压降得到的电流,
不需要电流感应电阻器。附加欠压和
过电压保护监视FB引脚上的电压是否短路和
过电压保护。过电流保护使软起动循环
起作用,直到4个过电流事件被计数。拉并保持电压
在低于0.15V的OCSET引脚上,使用开放式排水装置关闭控制器

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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产品简介

目录cAV嘉泰姆

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

一,产品概述(General Description)     cAV嘉泰姆


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


1.)Operating with Single 5~12V Supply VoltagecAV嘉泰姆
2.)or Two Supply VoltagescAV嘉泰姆
3.)Drive Dual Low Cost N-Channel MOSFETscAV嘉泰姆
     Adaptive Shoot-Through ProtectioncAV嘉泰姆
4.)Built-in Feedback CompensationcAV嘉泰姆
    Voltage-Mode PWM ControlcAV嘉泰姆
    0~100% Duty RatiocAV嘉泰姆
     Fast Transient ResponsecAV嘉泰姆
5.)±2% 0.8V ReferencecAV嘉泰姆
    Over Line, Load Regulation, and Operating   cAV嘉泰姆
6.)Temperature Programmable Over-Current ProtectioncAV嘉泰姆
   Using RDS(ON) of Low-Side MOSFETcAV嘉泰姆
7.)Hiccup-Mode Under-Voltage ProtectioncAV嘉泰姆
8.)118% Over-Voltage ProtectioncAV嘉泰姆
9.)Adjustable Output VoltagecAV嘉泰姆
10.)Small Converter SizecAV嘉泰姆
      300kHz Constant Switching FrequencycAV嘉泰姆
      Small SOP-8 PackagecAV嘉泰姆
11.)Built-In Digital Soft-StartcAV嘉泰姆
12.)Shutdown Control Using an External MOSFETcAV嘉泰姆
13.)Lead Free and Green Devices AvailablecAV嘉泰姆
三,应用范围 (Applications)cAV嘉泰姆


MotherboardcAV嘉泰姆
Graphics CardcAV嘉泰姆
High Current, up to 20A, DC-DC ConverterscAV嘉泰姆
四.下载产品资料PDF文档 cAV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cAV嘉泰姆

 QQ截图20160419174301.jpgcAV嘉泰姆

五,产品封装图 (Package)cAV嘉泰姆

cAV嘉泰姆

BOOT (Pin 1)cAV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.cAV嘉泰姆
UGATE (Pin 2)cAV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.cAV嘉泰姆
GND (Pin 3)cAV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.cAV嘉泰姆
LGATE (Pin 4)cAV嘉泰姆
Connect this pin to the low-side N-channel MOSFET’s gate. This pin provides gate drive for the low-side MOSFETcAV嘉泰姆
VCC (Pin 5)cAV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. cAV嘉泰姆
FB (Pin 6)cAV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 :cAV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. cAV嘉泰姆
OCSET (Pin 7)cAV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:cAV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.cAV嘉泰姆
PHASE (Pin 8) cAV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 sourcecAV嘉泰姆
六.电路原理图cAV嘉泰姆
blob.pngcAV嘉泰姆
七,功能概述cAV嘉泰姆
Power-On-Reset (POR) cAV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. cAV嘉泰姆
Soft-StartcAV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-cAV嘉泰姆
ence voltage. The soft-start interval is about 3.2mstypical, independent of the converter’s input and out-put voltages.cAV嘉泰姆
Over-Current Protection (OCP)cAV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 thecAV嘉泰姆
Over-Current Protection (OCP) (Cont.)cAV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 cAV嘉泰姆

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1cAV嘉泰姆

1cAV嘉泰姆

30cAV嘉泰姆

3cAV嘉泰姆

25cAV嘉泰姆

0.8cAV嘉泰姆

5~12cAV嘉泰姆

2000cAV嘉泰姆

CXSD62102cAV嘉泰姆

TQFN3x3-16cAV嘉泰姆

COTcAV嘉泰姆

1cAV嘉泰姆

1cAV嘉泰姆

30cAV嘉泰姆

1.8cAV嘉泰姆

28cAV嘉泰姆

0.6cAV嘉泰姆

5cAV嘉泰姆

600cAV嘉泰姆

CXSD62102AcAV嘉泰姆

TQFN 3x3 16cAV嘉泰姆

COTcAV嘉泰姆

1cAV嘉泰姆

1cAV嘉泰姆

30cAV嘉泰姆

1.8cAV嘉泰姆

28cAV嘉泰姆

0.6cAV嘉泰姆

5cAV嘉泰姆

600cAV嘉泰姆

CXSD62103cAV嘉泰姆

QFN4x4-24cAV嘉泰姆

VMcAV嘉泰姆

2cAV嘉泰姆

1cAV嘉泰姆

50cAV嘉泰姆

4.5cAV嘉泰姆

13.2cAV嘉泰姆

0.6cAV嘉泰姆

5~12cAV嘉泰姆

5000cAV嘉泰姆

CXSD62104cAV嘉泰姆

TQFN4x4-24cAV嘉泰姆

COTcAV嘉泰姆

1cAV嘉泰姆

2cAV嘉泰姆

15cAV嘉泰姆

6cAV嘉泰姆

25cAV嘉泰姆

2cAV嘉泰姆

NcAV嘉泰姆

550cAV嘉泰姆

CXSD62105cAV嘉泰姆

TQFN4x4-24cAV嘉泰姆

COTcAV嘉泰姆

1cAV嘉泰姆

2cAV嘉泰姆

15cAV嘉泰姆

6cAV嘉泰姆

25cAV嘉泰姆

2cAV嘉泰姆

NcAV嘉泰姆

550cAV嘉泰姆

CXSD62106|AcAV嘉泰姆

TQFN4x4-4cAV嘉泰姆

TQFN3x3-20cAV嘉泰姆

COTcAV嘉泰姆

1cAV嘉泰姆

2cAV嘉泰姆

20cAV嘉泰姆

3cAV嘉泰姆

28cAV嘉泰姆

0.75cAV嘉泰姆

5cAV嘉泰姆

800cAV嘉泰姆

CXSD62107cAV嘉泰姆

TQFN3x3-16cAV嘉泰姆

COTcAV嘉泰姆

1cAV嘉泰姆

1cAV嘉泰姆

20cAV嘉泰姆

1.8cAV嘉泰姆

28cAV嘉泰姆

0.75cAV嘉泰姆

5cAV嘉泰姆

400cAV嘉泰姆

CXSD62108cAV嘉泰姆

QFN3.5x3.5-14cAV嘉泰姆

TQFN3x3-16cAV嘉泰姆

COTcAV嘉泰姆

1cAV嘉泰姆

1cAV嘉泰姆

20cAV嘉泰姆

1.8cAV嘉泰姆

28cAV嘉泰姆

0.75cAV嘉泰姆

5cAV嘉泰姆

400cAV嘉泰姆

CXSD62109cAV嘉泰姆

TQFN3x3-16cAV嘉泰姆

COTcAV嘉泰姆

1cAV嘉泰姆

2cAV嘉泰姆

20cAV嘉泰姆

1.8cAV嘉泰姆

28cAV嘉泰姆

0.75cAV嘉泰姆

5cAV嘉泰姆

400cAV嘉泰姆

CXSD62110cAV嘉泰姆

QFN3x3-20cAV嘉泰姆

TQFN3x3-16cAV嘉泰姆

COTcAV嘉泰姆

1cAV嘉泰姆

2cAV嘉泰姆

20cAV嘉泰姆

3cAV嘉泰姆

28cAV嘉泰姆

1.8|1.5|0.5cAV嘉泰姆

5cAV嘉泰姆

740cAV嘉泰姆

CXSD62111cAV嘉泰姆

TQFN4x4-24cAV嘉泰姆

|QFN3x3-20cAV嘉泰姆

CMcAV嘉泰姆

1cAV嘉泰姆

2cAV嘉泰姆

15cAV嘉泰姆

5cAV嘉泰姆

28cAV嘉泰姆

0.5cAV嘉泰姆

NcAV嘉泰姆

3000cAV嘉泰姆

CXSD62112cAV嘉泰姆

TDFN3x3-10cAV嘉泰姆

COTcAV嘉泰姆

1cAV嘉泰姆

1cAV嘉泰姆

20cAV嘉泰姆

1.8cAV嘉泰姆

28cAV嘉泰姆

0.5cAV嘉泰姆

5cAV嘉泰姆

250cAV嘉泰姆

CXSD62113|CcAV嘉泰姆

TQFN3x3-20cAV嘉泰姆

COTcAV嘉泰姆

1cAV嘉泰姆

2cAV嘉泰姆

15cAV嘉泰姆

6cAV嘉泰姆

25cAV嘉泰姆

2cAV嘉泰姆

NcAV嘉泰姆

550cAV嘉泰姆

CXSD62113EcAV嘉泰姆

TQFN 3x3 20cAV嘉泰姆

COTcAV嘉泰姆

2cAV嘉泰姆

2cAV嘉泰姆

11cAV嘉泰姆

6cAV嘉泰姆

25cAV嘉泰姆

2cAV嘉泰姆

NcAV嘉泰姆

550cAV嘉泰姆

CXSD62114cAV嘉泰姆

TQFN3x3-20cAV嘉泰姆

COTcAV嘉泰姆

2cAV嘉泰姆

2cAV嘉泰姆

11cAV嘉泰姆

5.5cAV嘉泰姆

25cAV嘉泰姆

2cAV嘉泰姆

NcAV嘉泰姆

280cAV嘉泰姆

CXSD62115cAV嘉泰姆

QFN4x4-24cAV嘉泰姆

VMcAV嘉泰姆

2cAV嘉泰姆

1cAV嘉泰姆

60cAV嘉泰姆

3.1cAV嘉泰姆

13.2cAV嘉泰姆

0.85cAV嘉泰姆

12cAV嘉泰姆

5000cAV嘉泰姆

CXSD62116A|B|CcAV嘉泰姆

SOP-8PcAV嘉泰姆

VMcAV嘉泰姆

1cAV嘉泰姆

1cAV嘉泰姆

20cAV嘉泰姆

2.9cAV嘉泰姆

13.2cAV嘉泰姆

0.8cAV嘉泰姆

12cAV嘉泰姆

16000cAV嘉泰姆

CXSD62117cAV嘉泰姆

SOP-20cAV嘉泰姆

VMcAV嘉泰姆

2cAV嘉泰姆

2cAV嘉泰姆

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10cAV嘉泰姆

13.2cAV嘉泰姆

1cAV嘉泰姆

12cAV嘉泰姆

5000cAV嘉泰姆

CXSD62118cAV嘉泰姆

TDFN3x3-10cAV嘉泰姆

COTcAV嘉泰姆

1cAV嘉泰姆

1cAV嘉泰姆

25cAV嘉泰姆

1.8cAV嘉泰姆

28cAV嘉泰姆

0.7cAV嘉泰姆

5cAV嘉泰姆

250cAV嘉泰姆

CXSD62119cAV嘉泰姆

TQFN3x3-20cAV嘉泰姆

COTcAV嘉泰姆

2cAV嘉泰姆

1cAV嘉泰姆

40cAV嘉泰姆

1.8cAV嘉泰姆

25cAV嘉泰姆

REFIN SettingcAV嘉泰姆

5cAV嘉泰姆

700cAV嘉泰姆

CXSD62120cAV嘉泰姆

QFN 3x3 20cAV嘉泰姆

TQFN 3x3 16cAV嘉泰姆

COTcAV嘉泰姆

1cAV嘉泰姆

2cAV嘉泰姆

20cAV嘉泰姆

3cAV嘉泰姆

28cAV嘉泰姆

1.8|1.5 1.35|1.2 0.5cAV嘉泰姆

5cAV嘉泰姆

800cAV嘉泰姆

CXSD62121AcAV嘉泰姆

TQFN3x3 20cAV嘉泰姆

COTcAV嘉泰姆

1cAV嘉泰姆

2cAV嘉泰姆

15cAV嘉泰姆

3cAV嘉泰姆

28cAV嘉泰姆

0.75cAV嘉泰姆

5cAV嘉泰姆

220cAV嘉泰姆

CXSD62121BcAV嘉泰姆

TQFN3x3 20cAV嘉泰姆

COTcAV嘉泰姆

1cAV嘉泰姆

2cAV嘉泰姆

15cAV嘉泰姆

3cAV嘉泰姆

28cAV嘉泰姆

0.75cAV嘉泰姆

5cAV嘉泰姆

220cAV嘉泰姆

CXSD62121cAV嘉泰姆

TQFN3x3-20cAV嘉泰姆

COTcAV嘉泰姆

1cAV嘉泰姆

2cAV嘉泰姆

20cAV嘉泰姆

3cAV嘉泰姆

28cAV嘉泰姆

0.75cAV嘉泰姆

5cAV嘉泰姆

180cAV嘉泰姆

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