CXSD62159恒频电流模式开关稳压器PFM/PWM模式操作电流模式控制车辆识别号上电复位（POR）和欠电压锁定

一,产品概述(General Description)         rXk嘉泰姆

       CXSD62159 is a 2A synchronous buck converter with integrated power MOSFETs. The CXSD62159 design with a current-mode control scheme, can convert wide input voltage of 4.5V to 24V to the output voltage adjustable from 0. 8V to 20V to provide excellent output voltage regulation. The CXSD62159 is equipped with an automatic PFM/PWM mode operation. At light load, the IC operates in the PFM mode to reduce the switching losses. At heavy load, the IC works in PWM. The CXSD62159 is also equipped with Power-on-reset, softstart, soft-stop, and whole protections (under-voltage, over-temperature, and current-limit) into a single package. This device, available TDFN3x3-10, provides a very compact system solution external components and PCB arearXk嘉泰姆

Main Control LooprXk嘉泰姆

        The CXSD62159 is a constant frequency current mode switching regulator.rXk嘉泰姆
During normal operation, the internal N-channel power MOSFET is turned onrXk嘉泰姆
each cycle when the oscillator sets an internal RS latch and would be turnedrXk嘉泰姆
off when an internal current comparator (ICMP) resets the latch. The peakrXk嘉泰姆
inductor current at which ICMP resets the RS latch is controlled by the voltagerXk嘉泰姆
on the COMP pin, which is the output of the error amplifier (EAMP). An externalrXk嘉泰姆
resistive divider connected between VOUT and ground allows the EAMP torXk嘉泰姆
receive an output feedback voltage VFB at FB pin. When the load currentrXk嘉泰姆
increases, it causes a slight decrease in VFB relative to the 0.8V reference,rXk嘉泰姆
which in turn causes the COMP voltage to increase until the average inductorrXk嘉泰姆
current matches the new load current.rXk嘉泰姆
VIN Power-On-Reset (POR) and EN Under-voltageLockoutrXk嘉泰姆
The CXSD62159 keep monitoring the voltage on VIN pin to prevent wrong logicrXk嘉泰姆
operations which may occur when VIN voltage is not high enough for the internalrXk嘉泰姆
control circuitry to operate. The VIN POR has a rising threshold of 4.05V (typical)rXk嘉泰姆
with 0.3V of hysteresis.An external under-voltage lockout (UVLO) is sensed atrXk嘉泰姆
the EN pin. The EN UVLO has a rising threshold of 2.5V with 0.2V of hysteresis.rXk嘉泰姆
The EN pin should be connected a resistor divider from VIN to EN .After the VINrXk嘉泰姆
and EN voltages exceed their respective voltage thresholds, the IC starts arXk嘉泰姆
start-up process and then ramps up the output voltage to the setting of outputrXk嘉泰姆
voltage.rXk嘉泰姆
Over-Temperature Protection (OTP)rXk嘉泰姆
The over-temperature circuit limits the junction tempera ture of the CXSD62159rXk嘉泰姆
When the junction temperature exceeds TJ =+160oC, a thermal sensor turnsrXk嘉泰姆
off the power MOSFET, allowing the device to cool down. The thermal sensorrXk嘉泰姆
allows the converter to start a start-up process and regulate the output voltagerXk嘉泰姆
again after the junction temperature cools by 50oC.The OTP designed with a 50 oCrXk嘉泰姆
hysteresis lowers the average T J during c ontinuous thermal overload conditions,rXk嘉泰姆
increasing life time of the IC.rXk嘉泰姆
Enable/ShutdownrXk嘉泰姆
Driving EN to ground places the CXSD62159 in shutdown.When in shutdown, therXk嘉泰姆
internal N-Channel power MOSFET turns off, all internal circuitry shuts down andrXk嘉泰姆
the quiescent supply current reduces to 0.3μA.rXk嘉泰姆
Current-Limit ProtectionrXk嘉泰姆
The CXSD62159 monitors the output current, flowing through the N-Channel powerrXk嘉泰姆
MOSFET, and limits the IC from damages during overload, short-circuit and over-rXk嘉泰姆
voltage conditions. rXk嘉泰姆
Frequency FoldbackrXk嘉泰姆
The foldback frequency is controlled by the FB voltage.When the FB pin voltagerXk嘉泰姆
is under 0.6V, the frequency of the oscillator will be reduced to 110kHz. This lowerrXk嘉泰姆
frequency allows the inductor current to safely discharge,thereby preventing currentrXk嘉泰姆
runaway. The oscillator’s frequency will switch to its designed rate when the feedbackrXk嘉泰姆
voltage on FB rises above the rising frequency foldback threshold (0.6V, typical) again.rXk嘉泰姆
Over-Voltage ProtectionrXk嘉泰姆
The over-voltage function monitors the output voltage by FB pin. When the FB voltagerXk嘉泰姆
increase over 120% of the reference voltage, the over-voltage protection compara-rXk嘉泰姆
tor will force the high-and low-side MOSFET gate driver off. As soon as the outputrXk嘉泰姆
voltage is within regulation, the OVP comparator is disengaged. The chip will restore itsrXk嘉泰姆
normal operation.rXk嘉泰姆
二.产品特点(Features)rXk嘉泰姆
Wide Input Voltage from 4.5V to 24VrXk嘉泰姆
2A Continuous Output CurrentrXk嘉泰姆
Adjustable Output Voltage from 0.8V to 20VrXk嘉泰姆
Intergrated High/Low Side MOSFETrXk嘉泰姆
PFM/PWM mode OperationrXk嘉泰姆
Fixed 340kHz Switching FrequencyrXk嘉泰姆
Stable with Low ESR Ceramic Output CapacitorsrXk嘉泰姆
Power-On-Reset DetectionrXk嘉泰姆
Programmable Soft-StartrXk嘉泰姆
Over-Temperature ProtectionrXk嘉泰姆
Current-Limit Protection with Frequency FoldbackrXk嘉泰姆
Enable/Shutdown FunctionrXk嘉泰姆
Small TDFN3x3-10 PackagesrXk嘉泰姆
Lead Free and Green Devices Available (RoHS Compliant)rXk嘉泰姆
三,应用范围 (Applications) rXk嘉泰姆

LCD Monitor/TVrXk嘉泰姆

Set-Top BoxrXk嘉泰姆
DSL, Switch HUBrXk嘉泰姆
Notebook ComputerrXk嘉泰姆

四.下载产品资料PDF文档 rXk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！rXk嘉泰姆

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五,产品封装图 (Package)rXk嘉泰姆

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六.电路原理图rXk嘉泰姆

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Switching Regulator > Buck ConverterrXk嘉泰姆

 Part_No rXk嘉泰姆

 PackagerXk嘉泰姆

ArchitecturXk嘉泰姆

No.ofrXk嘉泰姆

PWM rXk嘉泰姆

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