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

一,产品概述(General Description)     CXSD62136 CXSD62136B is a 2A synchronous buck converter with integrated power MOSFETs.The CXSD62136 CXSD62136B design with a current-mode control scheme, can convert wide input voltage of 4.5V to 24V to the output voltage adjustable from 0.92V to 20V to provide excellent output voltage regulation. The CXSD62136 CXSD62136B is also equipped with Power-on-reset, softstart, and whole protections (over-temperature, and current-limit) into a single package.This device, available SOP-8, provides a very compact system solution external components and PCB area  agd嘉泰姆

二.产品特点(Features)agd嘉泰姆

Wide Input Voltage from 4.5V to 24Vagd嘉泰姆
2A Continuous Output Currentagd嘉泰姆
Adjustable Output Voltage from 0.92V to 20Vagd嘉泰姆
Intergrated N-MOSFETagd嘉泰姆
Fixed 340kHz Switching Frequencyagd嘉泰姆
Stable with Low ESR Capacitorsagd嘉泰姆
Power-On-Reset Detectionagd嘉泰姆
Programmable Soft-Startagd嘉泰姆
Over-Temperature Protectionagd嘉泰姆
Over-Voltage Protectionagd嘉泰姆
Current-Limit Protection with Frequency Foldbackagd嘉泰姆
Enable/Shutdown Functionagd嘉泰姆
Small SOP-8 Packageagd嘉泰姆
Lead Free and Green Devices Available (RoHS Compliant)agd嘉泰姆

三,应用范围 (Applications)agd嘉泰姆

LCD Monitor/TVagd嘉泰姆
Set-Top Boxagd嘉泰姆

DSL, Switch HUBagd嘉泰姆
Notebook Computeragd嘉泰姆

四.下载产品资料PDF文档 agd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！agd嘉泰姆

 agd嘉泰姆

五,产品封装图 (Package)agd嘉泰姆

agd嘉泰姆

六.电路原理图agd嘉泰姆

agd嘉泰姆

• 七,功能概述agd嘉泰姆

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Main Control Loop The CXSD62136 CXSD62136B is a constant frequency current mode switching regulator. During normal operation, the inter-agd嘉泰姆

nal N-channel power MOSFET is turned on each cycle when the oscillator sets an internal RS latch and wouldagd嘉泰姆
be turned off when an internal current comparator (ICMP) resets the latch. The peak inductor current at which ICMPagd嘉泰姆
resets the RS latch is controlled by the voltage on the COMP pin, which is the output of the error amplifieragd嘉泰姆
(EAMP). An external resistive divider connected between VOUT and ground allows the EAMP to receive an outputagd嘉泰姆
feedback voltage VFB at FB pin. When the load current increases, it causes a slight decrease in VFB relative toagd嘉泰姆
the 0.92V reference, which in turn causes the COMP volt- age to increase until the average inductor current matchesagd嘉泰姆
the new load current. agd嘉泰姆
VIN Power-On-Reset (POR) and EN Under-voltage Lockoutagd嘉泰姆
The CXSD62136 CXSD62136B keep monitoring the voltage on VIN pin to prevent wrong logic operations which may occur when VIN voltage is not high enough for the internal control circuitry to operate. The VIN POR has a rising thresholdagd嘉泰姆
of 4.1V (typical) with 0.5V of hysteresis.An external under-voltage lockout (UVLO) is sensed at the EN pin. Theagd嘉泰姆
EN UVLO has a rising threshold of 2.5V with 0.2V of hysteresis. The EN pin should be connectedagd嘉泰姆
a resistor divider from VIN to EN.After the VIN and EN voltages exceed their respective voltage thresholds,agd嘉泰姆
the IC starts a start-up process and then ramps up the output voltage to the setting of output voltage.agd嘉泰姆
Over-Temperature Protection (OTP)agd嘉泰姆
The over-temperature circuit limits the junction tempera-ture of the CXSD62136 CXSD62136B. When the junction temperature ex-ceeds TJ = +160oC, a thermal sensor turns off the power MOSFET, allowing the devices to cool. The thermal sen-sor allows the converter to start a start-up process and regulate the output voltage again after the junction tem-agd嘉泰姆
perature cools by 50oC.The OTP is designed with a 50oC hysteresis to lower the average TJ during continuous thermal overload conditions,increasing lifetime of the lC.agd嘉泰姆
Enable / Shutdownagd嘉泰姆
Driving EN to ground places the CXSD62136 CXSD62136B in shutdown. When in shutdown, the internal power MOSFET turns off,all internal circuitry shuts down.agd嘉泰姆
Current-Limit Protectionagd嘉泰姆
The CXSD62136 CXSD62136B monitors the output current, flowing through the N-Channel power MOSFET, and limits theagd嘉泰姆
IC from damages during overload, short-circuit and over- voltage conditions. agd嘉泰姆
Frequency Foldbackagd嘉泰姆
The foldback frequency is controlled by the FB voltage.When the FB pin voltage is under 0.6V, the frequency ofagd嘉泰姆
the oscillator will be reduced to 110kHz. This lower fre-quency allows the inductor current to safely discharge,agd嘉泰姆
thereby preventing current runaway. The oscillator’s fre-quency will switch to its designed rate when the feedbackagd嘉泰姆
voltage on FB rises above the rising frequency foldback threshold (0.6V, typical) again.agd嘉泰姆
Over-Voltage Protectionagd嘉泰姆
The over-voltage function monitors the output voltage by FB pin. When the FB voltage increase over 120% of theagd嘉泰姆
reference voltage, the over-voltage protection compara-tor will force the low-side MOSFET gate driver high. Thisagd嘉泰姆
action actively pulls down the output voltage. As soon as the output voltage is within regulation, the OVP compara-agd嘉泰姆
tor is disengaged. The chip will restore its normal operation.agd嘉泰姆

八,相关产品         更多同类产品.......agd嘉泰姆

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