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

发表时间：2020-04-21浏览次数：80

目录E7D嘉泰姆

1.产品概述         2.产品特点E7D嘉泰姆
3.应用范围       4.下载产品资料PDF文档 E7D嘉泰姆
5.产品封装图                     6.电路原理图             E7D嘉泰姆
7.功能概述       8.相关产品E7D嘉泰姆

一,产品概述(General Description) E7D嘉泰姆

The CXSD6276 CXSD6276A is a fixed 300kHz frequency, voltage mode, andE7D嘉泰姆
synchronous PWM controller. The device drives two low cost N-channelE7D嘉泰姆
MOSFETs and is de-signed to work with single 5~12V or two supplyE7D嘉泰姆
voltage(s), providing excellent regulation for load transients.E7D嘉泰姆
The CXSD6276 CXSD6276A integrates controls, monitoring, and protection functionsE7D嘉泰姆
into a single 8-pin package to provide a low cost and perfect power solution.E7D嘉泰姆
A power-on-reset (POR) circuit monitors the VCC supply voltage to preventE7D嘉泰姆
wrong logic controls. An internal 0.8V reference provides low output voltageE7D嘉泰姆
down to 0.8V for further applications. An built-in digital soft-start with fixedE7D嘉泰姆
soft-start interval prevents the output voltage from overshoot as well as limitsE7D嘉泰姆
the input current. The controller’s over-current protection monitors the outputE7D嘉泰姆
current by using the voltage drop across the low-side MOSFET’s RDS(ON),E7D嘉泰姆
eliminating the need of a current sensing resistor. Additional under voltage andE7D嘉泰姆
over voltage protections monitor the voltage on FB pin for short-circuit andE7D嘉泰姆
over-voltage protections. The over-current protection cycles the soft-startE7D嘉泰姆
function until 4 over-current events are counted.Pulling and holding the voltageE7D嘉泰姆
on OCSET pin below 0.15V with an open drain device shuts down the controller.E7D嘉泰姆
二.产品特点(Features)E7D嘉泰姆

1.)Operating with Single 5~12V Supply VoltageE7D嘉泰姆
2.)or Two Supply VoltagesE7D嘉泰姆
3.)Drive Dual Low Cost N-Channel MOSFETsE7D嘉泰姆
Adaptive Shoot-Through ProtectionE7D嘉泰姆
4.)Built-in Feedback CompensationE7D嘉泰姆
Voltage-Mode PWM ControlE7D嘉泰姆
0~100% Duty RatioE7D嘉泰姆
Fast Transient ResponseE7D嘉泰姆
5.)±2% 0.8V ReferenceE7D嘉泰姆
Over Line, Load Regulation, and Operating E7D嘉泰姆
6.)Temperature Programmable Over-Current ProtectionE7D嘉泰姆
Using RDS(ON) of Low-Side MOSFETE7D嘉泰姆
7.)Hiccup-Mode Under-Voltage ProtectionE7D嘉泰姆
8.)118% Over-Voltage ProtectionE7D嘉泰姆
9.)Adjustable Output VoltageE7D嘉泰姆
10.)Small Converter SizeE7D嘉泰姆
300kHz Constant Switching FrequencyE7D嘉泰姆
Small SOP-8 PackageE7D嘉泰姆
11.)Built-In Digital Soft-StartE7D嘉泰姆
12.)Shutdown Control Using an External MOSFETE7D嘉泰姆
13.)Lead Free and Green Devices AvailableE7D嘉泰姆
三,应用范围 (Applications)E7D嘉泰姆

MotherboardE7D嘉泰姆
Graphics CardE7D嘉泰姆
High Current, up to 20A, DC-DC ConvertersE7D嘉泰姆
四.下载产品资料PDF文档 E7D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！E7D嘉泰姆

QQ截图20160419174301.jpg E7D嘉泰姆

五,产品封装图 (Package)E7D嘉泰姆

E7D嘉泰姆

BOOT (Pin 1)E7D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.E7D嘉泰姆
UGATE (Pin 2)E7D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.E7D嘉泰姆
GND (Pin 3)E7D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.E7D嘉泰姆
LGATE (Pin 4)E7D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. E7D嘉泰姆
VCC (Pin 5)E7D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. E7D嘉泰姆
FB (Pin 6)E7D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 :E7D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. E7D嘉泰姆
OCSET (Pin 7)E7D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:E7D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.E7D嘉泰姆
PHASE (Pin 8) E7D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 sourceE7D嘉泰姆
六.电路原理图E7D嘉泰姆
E7D嘉泰姆
七,功能概述E7D嘉泰姆
Power-On-Reset (POR) E7D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. E7D嘉泰姆
Soft-StartE7D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-E7D嘉泰姆
ence voltage. The soft-start interval is about 3.2mstypical, independent of the converter’s input and out-put voltages.E7D嘉泰姆
Over-Current Protection (OCP)E7D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 theE7D嘉泰姆
Over-Current Protection (OCP) (Cont.)E7D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 E7D嘉泰姆

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Part_No E7D嘉泰姆	Package E7D嘉泰姆	ArchiE7D嘉泰姆 tectuE7D嘉泰姆	PhaseE7D嘉泰姆	No.ofE7D嘉泰姆 PWME7D嘉泰姆 OutputE7D嘉泰姆	Output E7D嘉泰姆 CurrentE7D嘉泰姆 (A) E7D嘉泰姆	minE7D嘉泰姆	maxE7D嘉泰姆	ReferenceE7D嘉泰姆 VoltageE7D嘉泰姆 (V) E7D嘉泰姆	Bias E7D嘉泰姆 VoltageE7D嘉泰姆 (V) E7D嘉泰姆	QuiescentE7D嘉泰姆 CurrentE7D嘉泰姆 (uA) E7D嘉泰姆
CXSD6273E7D嘉泰姆	SOP-14E7D嘉泰姆 QSOP-16E7D嘉泰姆 QFN4x4-16E7D嘉泰姆	VM E7D嘉泰姆	1 E7D嘉泰姆	1 E7D嘉泰姆	30E7D嘉泰姆	2.9 E7D嘉泰姆	13.2E7D嘉泰姆	0.9E7D嘉泰姆	12 E7D嘉泰姆	8000E7D嘉泰姆
CXSD6274E7D嘉泰姆	SOP-8E7D嘉泰姆	VM E7D嘉泰姆	1E7D嘉泰姆	1E7D嘉泰姆	20E7D嘉泰姆	2.9 E7D嘉泰姆	13.2 E7D嘉泰姆	0.8E7D嘉泰姆	12E7D嘉泰姆	5000E7D嘉泰姆
CXSD6274CE7D嘉泰姆	SOP-8E7D嘉泰姆	VME7D嘉泰姆	1E7D嘉泰姆	1E7D嘉泰姆	20E7D嘉泰姆	2.9E7D嘉泰姆	13.2E7D嘉泰姆	0.8E7D嘉泰姆	12E7D嘉泰姆	5000E7D嘉泰姆
CXSD6275E7D嘉泰姆	QFN4x4-24E7D嘉泰姆	VME7D嘉泰姆	2E7D嘉泰姆	1E7D嘉泰姆	60E7D嘉泰姆	3.1E7D嘉泰姆	13.2E7D嘉泰姆	0.6E7D嘉泰姆	12E7D嘉泰姆	5000E7D嘉泰姆
CXSD6276E7D嘉泰姆	SOP-8E7D嘉泰姆	VME7D嘉泰姆	1E7D嘉泰姆	1E7D嘉泰姆	20E7D嘉泰姆	2.2E7D嘉泰姆	13.2E7D嘉泰姆	0.8E7D嘉泰姆	5~12E7D嘉泰姆	2100E7D嘉泰姆
CXSD6276AE7D嘉泰姆	SOP-8E7D嘉泰姆	VME7D嘉泰姆	1E7D嘉泰姆	1E7D嘉泰姆	20E7D嘉泰姆	2.2E7D嘉泰姆	13.2E7D嘉泰姆	0.8E7D嘉泰姆	5~12E7D嘉泰姆	2100E7D嘉泰姆
CXSD6277/A/BE7D嘉泰姆	SOP8\|TSSOP8E7D嘉泰姆	VME7D嘉泰姆	1E7D嘉泰姆	1E7D嘉泰姆	5E7D嘉泰姆	5E7D嘉泰姆	13.2E7D嘉泰姆	1.25\|0.8E7D嘉泰姆	5~12E7D嘉泰姆	3000E7D嘉泰姆
CXSD6278E7D嘉泰姆	SOP-8E7D嘉泰姆	VME7D嘉泰姆	1E7D嘉泰姆	1E7D嘉泰姆	10E7D嘉泰姆	3.3E7D嘉泰姆	5.5E7D嘉泰姆	0.8E7D嘉泰姆	5E7D嘉泰姆	2100E7D嘉泰姆
CXSD6279BE7D嘉泰姆	SOP-14E7D嘉泰姆	VM E7D嘉泰姆	1E7D嘉泰姆	1E7D嘉泰姆	10E7D嘉泰姆	5E7D嘉泰姆	13.2E7D嘉泰姆	0.8E7D嘉泰姆	12E7D嘉泰姆	2000E7D嘉泰姆
CXSD6280E7D嘉泰姆	TSSOP-24E7D嘉泰姆 \|QFN5x5-32E7D嘉泰姆	VME7D嘉泰姆	1E7D嘉泰姆	2E7D嘉泰姆	20E7D嘉泰姆	5E7D嘉泰姆	13.2E7D嘉泰姆	0.6E7D嘉泰姆	5~12E7D嘉泰姆	4000E7D嘉泰姆
CXSD6281NE7D嘉泰姆	SOP14E7D嘉泰姆 QSOP16E7D嘉泰姆 QFN-16E7D嘉泰姆	VME7D嘉泰姆	1E7D嘉泰姆	1E7D嘉泰姆	30E7D嘉泰姆	2.9E7D嘉泰姆	13.2E7D嘉泰姆	0.9E7D嘉泰姆	12E7D嘉泰姆	4000E7D嘉泰姆
CXSD6282E7D嘉泰姆	SOP-14E7D嘉泰姆	VME7D嘉泰姆	1E7D嘉泰姆	1E7D嘉泰姆	30E7D嘉泰姆	2.2E7D嘉泰姆	13.2E7D嘉泰姆	0.6E7D嘉泰姆	12E7D嘉泰姆	5000E7D嘉泰姆
CXSD6282AE7D嘉泰姆	SOP-14E7D嘉泰姆	VME7D嘉泰姆	1E7D嘉泰姆	1E7D嘉泰姆	30E7D嘉泰姆	2.2E7D嘉泰姆	13.2E7D嘉泰姆	0.6E7D嘉泰姆	12E7D嘉泰姆	5000E7D嘉泰姆
CXSD6283E7D嘉泰姆	SOP-14E7D嘉泰姆	VME7D嘉泰姆	1E7D嘉泰姆	1E7D嘉泰姆	25E7D嘉泰姆	2.2E7D嘉泰姆	13.2E7D嘉泰姆	0.8E7D嘉泰姆	12E7D嘉泰姆	5000E7D嘉泰姆
CXSD6284/AE7D嘉泰姆	LQFP7x7 48E7D嘉泰姆 TQFN7x7-48E7D嘉泰姆	VME7D嘉泰姆	1E7D嘉泰姆	6E7D嘉泰姆	0.015E7D嘉泰姆	1.4E7D嘉泰姆	6.5E7D嘉泰姆	-E7D嘉泰姆	5E7D嘉泰姆	1800E7D嘉泰姆
CXSD6285E7D嘉泰姆	TSSOP-24PE7D嘉泰姆	VME7D嘉泰姆	1E7D嘉泰姆	2E7D嘉泰姆	20E7D嘉泰姆	2.97E7D嘉泰姆	5.5E7D嘉泰姆	0.8E7D嘉泰姆	5~12E7D嘉泰姆	5000E7D嘉泰姆
CXSD6286E7D嘉泰姆	SOP-14E7D嘉泰姆	VME7D嘉泰姆	1E7D嘉泰姆	1E7D嘉泰姆	10E7D嘉泰姆	5E7D嘉泰姆	13.2E7D嘉泰姆	0.8E7D嘉泰姆	12E7D嘉泰姆	3000E7D嘉泰姆
CXSD6287E7D嘉泰姆	SOP-8-P\|DIP-8E7D嘉泰姆	VME7D嘉泰姆	1E7D嘉泰姆	1E7D嘉泰姆	30E7D嘉泰姆	2.9E7D嘉泰姆	13.2E7D嘉泰姆	1.2E7D嘉泰姆	12E7D嘉泰姆	3000E7D嘉泰姆
CXSD6288E7D嘉泰姆	SSOP28E7D嘉泰姆 QFN4x4-24E7D嘉泰姆	VME7D嘉泰姆	1E7D嘉泰姆	2E7D嘉泰姆	20E7D嘉泰姆	5E7D嘉泰姆	24E7D嘉泰姆	0.9E7D嘉泰姆

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