CXSD6276 CXSD6276A fixed 300kHz frequency, voltage mode, and synchronous PWM controller. The device drives two low cost N-channel MOSFETs and is de-signed to work with single 5~12V

发布时间:2020-04-06 09:43:38 浏览次数:714 作者:嘉泰姆 来源:1
摘要:CXSD6276 CXSD6276A fixed 300kHz frequency, voltage mode, and synchronous PWM controller. The device drives two low cost N-channel MOSFETs and is de-signed to work with single 5~12V

目录o45嘉泰姆

1.产品概述                       2.产品特点
3.应用范围                       4.下载产品资料PDF文档 
5.产品封装图</span>                     6.电路原理图</span>                   
7.
功能概述
                        8.相关产品o45嘉泰姆

,产品概述(General Description)     o45嘉泰姆


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

二</span>.产品特点(Features)o45嘉泰姆


1.)Operating with Single 5~12V Supply Voltage
2.)or Two Supply Voltages
3.)Drive Dual Low Cost N-Channel MOSFETs
     Adaptive Shoot-Through Protection
4.)Built-in Feedback Compensation
    Voltage-Mode PWM Control
    0~100% Duty Ratio
     Fast Transient Response
5.)±2% 0.8V Reference
    Over Line, Load Regulation, and Operating   
6.)Temperature Programmable Over-Current Protection
   Using RDS(ON) of Low-Side MOSFET
7.)Hiccup-Mode Under-Voltage Protection
8.)118% Over-Voltage Protection
9.)Adjustable Output Voltage
10.)Small Converter Size
      300kHz Constant Switching Frequency
      Small SOP-8 Package
11.)Built-In Digital Soft-Start
12.)Shutdown Control Using an External MOSFET
13.)Lead Free and Green Devices Available

三</span>,应用范围 (Applications)o45嘉泰姆


Motherboard
Graphics Card
High Current, up to 20A, DC-DC Converters

四.下载产品资料PDF文档 o45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</span>!</span>o45嘉泰姆

 QQ截图20160419174301.jpgo45嘉泰姆

五,产品封装图 (Package)o45嘉泰姆


o45嘉泰姆

BOOT (Pin 1)o45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.
UGATE (Pin 2)
Connect this pin to the high-side N-channel MOSFET’s gate. This pin provides gate drive for the high-side MOSFET.
GND (Pin 3)
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.
LGATE (Pin 4)
Connect this pin to the low-side N-channel MOSFET’s gate. This pin provides gate drive for the low-side MOSFET. 
VCC (Pin 5)
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. 
FB (Pin 6)
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 :
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. 
OCSET (Pin 7)
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:
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.
PHASE (Pin 8) 
The pin provides return path for the high-side MOSFETdriver’s pull-low current. Connect this pin to the high-side MOSFET’s source
六.电路原理图</span>
blob.png
七</span>,功能概述
Power-On-Reset (POR) 
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. 
Soft-Start
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-
ence voltage. The soft-start interval is about 3.2mstypical, independent of the converter’s input and out-put voltages.
Over-Current Protection (OCP)
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 the
Over-Current Protection (OCP) (Cont.)
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 o45嘉泰姆

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o45嘉泰姆

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