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

二.产品特点(Features)NlZ嘉泰姆

Wide Input Voltage from 4.5V to 24VNlZ嘉泰姆
2A Continuous Output CurrentNlZ嘉泰姆
Adjustable Output Voltage from 0.92V to 20VNlZ嘉泰姆
Intergrated N-MOSFETNlZ嘉泰姆
Fixed 340kHz Switching FrequencyNlZ嘉泰姆
Stable with Low ESR CapacitorsNlZ嘉泰姆
Power-On-Reset DetectionNlZ嘉泰姆
Programmable Soft-StartNlZ嘉泰姆
Over-Temperature ProtectionNlZ嘉泰姆
Over-Voltage ProtectionNlZ嘉泰姆
Current-Limit Protection with Frequency FoldbackNlZ嘉泰姆
Enable/Shutdown FunctionNlZ嘉泰姆
Small SOP-8 PackageNlZ嘉泰姆
Lead Free and Green Devices Available (RoHS Compliant)NlZ嘉泰姆

三,应用范围 (Applications)NlZ嘉泰姆

LCD Monitor/TVNlZ嘉泰姆
Set-Top BoxNlZ嘉泰姆

DSL, Switch HUBNlZ嘉泰姆
Notebook ComputerNlZ嘉泰姆

四.下载产品资料PDF文档 NlZ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！NlZ嘉泰姆

 NlZ嘉泰姆

五,产品封装图 (Package)NlZ嘉泰姆

NlZ嘉泰姆

六.电路原理图NlZ嘉泰姆

NlZ嘉泰姆

• 七,功能概述NlZ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-NlZ嘉泰姆

nal N-channel power MOSFET is turned on each cycle when the oscillator sets an internal RS latch and wouldNlZ嘉泰姆
be turned off when an internal current comparator (ICMP) resets the latch. The peak inductor current at which ICMPNlZ嘉泰姆
resets the RS latch is controlled by the voltage on the COMP pin, which is the output of the error amplifierNlZ嘉泰姆
(EAMP). An external resistive divider connected between VOUT and ground allows the EAMP to receive an outputNlZ嘉泰姆
feedback voltage VFB at FB pin. When the load current increases, it causes a slight decrease in VFB relative toNlZ嘉泰姆
the 0.92V reference, which in turn causes the COMP volt- age to increase until the average inductor current matchesNlZ嘉泰姆
the new load current. NlZ嘉泰姆
VIN Power-On-Reset (POR) and EN Under-voltage LockoutNlZ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 thresholdNlZ嘉泰姆
of 4.1V (typical) with 0.5V of hysteresis.An external under-voltage lockout (UVLO) is sensed at the EN pin. TheNlZ嘉泰姆
EN UVLO has a rising threshold of 2.5V with 0.2V of hysteresis. The EN pin should be connectedNlZ嘉泰姆
a resistor divider from VIN to EN.After the VIN and EN voltages exceed their respective voltage thresholds,NlZ嘉泰姆
the IC starts a start-up process and then ramps up the output voltage to the setting of output voltage.NlZ嘉泰姆
Over-Temperature Protection (OTP)NlZ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-NlZ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.NlZ嘉泰姆
Enable / ShutdownNlZ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.NlZ嘉泰姆
Current-Limit ProtectionNlZ嘉泰姆
The CXSD62136 CXSD62136B monitors the output current, flowing through the N-Channel power MOSFET, and limits theNlZ嘉泰姆
IC from damages during overload, short-circuit and over- voltage conditions. NlZ嘉泰姆
Frequency FoldbackNlZ嘉泰姆
The foldback frequency is controlled by the FB voltage.When the FB pin voltage is under 0.6V, the frequency ofNlZ嘉泰姆
the oscillator will be reduced to 110kHz. This lower fre-quency allows the inductor current to safely discharge,NlZ嘉泰姆
thereby preventing current runaway. The oscillator’s fre-quency will switch to its designed rate when the feedbackNlZ嘉泰姆
voltage on FB rises above the rising frequency foldback threshold (0.6V, typical) again.NlZ嘉泰姆
Over-Voltage ProtectionNlZ嘉泰姆
The over-voltage function monitors the output voltage by FB pin. When the FB voltage increase over 120% of theNlZ嘉泰姆
reference voltage, the over-voltage protection compara-tor will force the low-side MOSFET gate driver high. ThisNlZ嘉泰姆
action actively pulls down the output voltage. As soon as the output voltage is within regulation, the OVP compara-NlZ嘉泰姆
tor is disengaged. The chip will restore its normal operation.NlZ嘉泰姆

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