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

发表时间：2020-04-21浏览次数：28

目录TyL嘉泰姆

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

一,产品概述(General Description) TyL嘉泰姆

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

1.)Operating with Single 5~12V Supply VoltageTyL嘉泰姆
2.)or Two Supply VoltagesTyL嘉泰姆
3.)Drive Dual Low Cost N-Channel MOSFETsTyL嘉泰姆
Adaptive Shoot-Through ProtectionTyL嘉泰姆
4.)Built-in Feedback CompensationTyL嘉泰姆
Voltage-Mode PWM ControlTyL嘉泰姆
0~100% Duty RatioTyL嘉泰姆
Fast Transient ResponseTyL嘉泰姆
5.)±2% 0.8V ReferenceTyL嘉泰姆
Over Line, Load Regulation, and Operating TyL嘉泰姆
6.)Temperature Programmable Over-Current ProtectionTyL嘉泰姆
Using RDS(ON) of Low-Side MOSFETTyL嘉泰姆
7.)Hiccup-Mode Under-Voltage ProtectionTyL嘉泰姆
8.)118% Over-Voltage ProtectionTyL嘉泰姆
9.)Adjustable Output VoltageTyL嘉泰姆
10.)Small Converter SizeTyL嘉泰姆
300kHz Constant Switching FrequencyTyL嘉泰姆
Small SOP-8 PackageTyL嘉泰姆
11.)Built-In Digital Soft-StartTyL嘉泰姆
12.)Shutdown Control Using an External MOSFETTyL嘉泰姆
13.)Lead Free and Green Devices AvailableTyL嘉泰姆
三,应用范围 (Applications)TyL嘉泰姆

MotherboardTyL嘉泰姆
Graphics CardTyL嘉泰姆
High Current, up to 20A, DC-DC ConvertersTyL嘉泰姆
四.下载产品资料PDF文档 TyL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！TyL嘉泰姆

QQ截图20160419174301.jpg TyL嘉泰姆

五,产品封装图 (Package)TyL嘉泰姆

TyL嘉泰姆

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

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CXSD6276TyL嘉泰姆	SOP-8TyL嘉泰姆	VMTyL嘉泰姆	1TyL嘉泰姆	1TyL嘉泰姆	20TyL嘉泰姆	2.2TyL嘉泰姆	13.2TyL嘉泰姆	0.8TyL嘉泰姆	5~12TyL嘉泰姆	2100TyL嘉泰姆
CXSD6276ATyL嘉泰姆	SOP-8TyL嘉泰姆	VMTyL嘉泰姆	1TyL嘉泰姆	1TyL嘉泰姆	20TyL嘉泰姆	2.2TyL嘉泰姆	13.2TyL嘉泰姆	0.8TyL嘉泰姆	5~12TyL嘉泰姆	2100TyL嘉泰姆
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CXSD6278TyL嘉泰姆	SOP-8TyL嘉泰姆	VMTyL嘉泰姆	1TyL嘉泰姆	1TyL嘉泰姆	10TyL嘉泰姆	3.3TyL嘉泰姆	5.5TyL嘉泰姆	0.8TyL嘉泰姆	5TyL嘉泰姆	2100TyL嘉泰姆
CXSD6279BTyL嘉泰姆	SOP-14TyL嘉泰姆	VM TyL嘉泰姆	1TyL嘉泰姆	1TyL嘉泰姆	10TyL嘉泰姆	5TyL嘉泰姆	13.2TyL嘉泰姆	0.8TyL嘉泰姆	12TyL嘉泰姆	2000TyL嘉泰姆
CXSD6280TyL嘉泰姆	TSSOP-24TyL嘉泰姆 \|QFN5x5-32TyL嘉泰姆	VMTyL嘉泰姆	1TyL嘉泰姆	2TyL嘉泰姆	20TyL嘉泰姆	5TyL嘉泰姆	13.2TyL嘉泰姆	0.6TyL嘉泰姆	5~12TyL嘉泰姆	4000TyL嘉泰姆
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CXSD6282TyL嘉泰姆	SOP-14TyL嘉泰姆	VMTyL嘉泰姆	1TyL嘉泰姆	1TyL嘉泰姆	30TyL嘉泰姆	2.2TyL嘉泰姆	13.2TyL嘉泰姆	0.6TyL嘉泰姆	12TyL嘉泰姆	5000TyL嘉泰姆
CXSD6282ATyL嘉泰姆	SOP-14TyL嘉泰姆	VMTyL嘉泰姆	1TyL嘉泰姆	1TyL嘉泰姆	30TyL嘉泰姆	2.2TyL嘉泰姆	13.2TyL嘉泰姆	0.6TyL嘉泰姆	12TyL嘉泰姆	5000TyL嘉泰姆
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CXSD6287TyL嘉泰姆	SOP-8-P\|DIP-8TyL嘉泰姆	VMTyL嘉泰姆	1TyL嘉泰姆	1TyL嘉泰姆	30TyL嘉泰姆	2.9TyL嘉泰姆	13.2TyL嘉泰姆	1.2TyL嘉泰姆	12TyL嘉泰姆	3000TyL嘉泰姆
CXSD6288TyL嘉泰姆	SSOP28TyL嘉泰姆 QFN4x4-24TyL嘉泰姆	VMTyL嘉泰姆	1TyL嘉泰姆	2TyL嘉泰姆	20TyL嘉泰姆	5TyL嘉泰姆	24TyL嘉泰姆	0.9TyL嘉泰姆

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