目录u5o嘉泰姆

一,产品概述(General Description)   u5o嘉泰姆

          The CXSD6277/A/B series are designed to provide a low cost synchronousu5o嘉泰姆
Buck regulator for on-board DC to DC con-verter applications. The CXSD6277/A/Bu5o嘉泰姆
series together with dual N-channel MOSFETs , provide au5o嘉泰姆
low cost solution for such applications. Each device fea-tures an internalu5o嘉泰姆
200/400kHz oscillator, Power-On-Reset (POR) for both VCC and VC supplies,u5o嘉泰姆
an external pro-grammable soft-start function as well as output under-u5o嘉泰姆
voltage detection that latches off the device when an out-put short is detected.u5o嘉泰姆
二.产品特点(Features)u5o嘉泰姆

1.)Operating with Single 5V or 12V Inputu5o嘉泰姆
2.)Drives N-Channel MOSFETsu5o嘉泰姆
3.)Simple Single-Loop Control Designu5o嘉泰姆
     Voltage-Mode PWM Controlu5o嘉泰姆
     Full 0% to 100% Duty Ratiou5o嘉泰姆
     Fast Transient Responseu5o嘉泰姆
4.)±2% Output Voltage Accuracy Over Temperatureu5o嘉泰姆
5.)Under-Voltage Protection for Outputu5o嘉泰姆
6.)200/400kHz Constant Frequency Operationu5o嘉泰姆
    200kHz for CXSD6277/A/BBu5o嘉泰姆
    400kHz for CXSD6277/A/BAu5o嘉泰姆
7.)Small size, 8-PIN Package (SOIC or TSSOP)u5o嘉泰姆
8.)Lead Free and Green Devices Available (RoHS Compliant)u5o嘉泰姆
三,应用范围 (Applications)u5o嘉泰姆

Graphics Cardsu5o嘉泰姆
DDR Memory Power Supplyu5o嘉泰姆
DDR Memory Termination Voltageu5o嘉泰姆
Low-Voltage Distributed Power Suppliesu5o嘉泰姆
四.下载产品资料PDF文档 u5o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！u5o嘉泰姆

 u5o嘉泰姆

五,产品封装图 (Package)u5o嘉泰姆
u5o嘉泰姆
FB (Pin 1)u5o嘉泰姆
Connect this pin to the output (VOUT) of the PWM con-verter via an external resistor divider to provide a voltageu5o嘉泰姆
feedback path for the converter. The output voltage set by the resistor divider is determined using the following u5o嘉泰姆

for-where ROUT is the resistor connected from VOUT to FB, and RGND is the resistor connected from FB to u5o嘉泰姆

ground.The voltage at this pin is also monitored for Under-Volt-age protection.u5o嘉泰姆
VCC (Pin 2)u5o嘉泰姆
Connect this pin to input voltage from 5V to 20V. This pin provides the bias for the control circuitry and the u5o嘉泰姆

power MOSFET driver (LDRV). The voltage at this pin is monitored for Power-On-Reset (POR) purpose.u5o嘉泰姆
LDRV (Pin 3)u5o嘉泰姆
Connect this pin to the gate of the low-side power MOSFET. This pin provides the gate drive for the MOSFET.u5o嘉泰姆
GND (Pin 4)u5o嘉泰姆
Signal and power ground for the IC. All voltage levels are measured with respect to this pin.u5o嘉泰姆
HDRV (Pin 5)u5o嘉泰姆
Connect this pin to the gate of the high-side power MOSFET. This pin provides the gate drive for the MOSFET.u5o嘉泰姆
VC (Pin 6)u5o嘉泰姆
This pin provides bias voltage to the high-side MOSFET driver. A bootstrap circuit may be used to pump a bootu5o嘉泰姆
voltage for enforcing the driving capability of the gate driver and improving the performance of the MOSFET.u5o嘉泰姆
COMP (Pin 7)u5o嘉泰姆
This pin is the output of the error amplifier. Add an exter-nal resistor-capacitor network to provide a loop compen-u5o嘉泰姆
sation for the PWM converter.u5o嘉泰姆

SS (Pin 8)u5o嘉泰姆
Connect a capacitor from this pin to ground.This capacitor,along with an internal 20μA current source, sets the soft-u5o嘉泰姆
start interval of the PWM converter and prevents the out-puts from overshoot as well as limits the input current.u5o嘉泰姆

Pull this pin below 0.5V can shutdown the converter.u5o嘉泰姆
六.电路原理图u5o嘉泰姆

u5o嘉泰姆
七,功能概述u5o嘉泰姆

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