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)         P2u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 areaP2u嘉泰姆

Main Control LoopP2u嘉泰姆

        The CXSD62159 is a constant frequency current mode switching regulator.P2u嘉泰姆
During normal operation, the internal N-channel power MOSFET is turned onP2u嘉泰姆
each cycle when the oscillator sets an internal RS latch and would be turnedP2u嘉泰姆
off when an internal current comparator (ICMP) resets the latch. The peakP2u嘉泰姆
inductor current at which ICMP resets the RS latch is controlled by the voltageP2u嘉泰姆
on the COMP pin, which is the output of the error amplifier (EAMP). An externalP2u嘉泰姆
resistive divider connected between VOUT and ground allows the EAMP toP2u嘉泰姆
receive an output feedback voltage VFB at FB pin. When the load currentP2u嘉泰姆
increases, it causes a slight decrease in VFB relative to the 0.8V reference,P2u嘉泰姆
which in turn causes the COMP voltage to increase until the average inductorP2u嘉泰姆
current matches the new load current.P2u嘉泰姆
VIN Power-On-Reset (POR) and EN Under-voltageLockoutP2u嘉泰姆
The CXSD62159 keep monitoring the voltage on VIN pin to prevent wrong logicP2u嘉泰姆
operations which may occur when VIN voltage is not high enough for the internalP2u嘉泰姆
control circuitry to operate. The VIN POR has a rising threshold of 4.05V (typical)P2u嘉泰姆
with 0.3V of hysteresis.An external under-voltage lockout (UVLO) is sensed atP2u嘉泰姆
the EN pin. The EN UVLO has a rising threshold of 2.5V with 0.2V of hysteresis.P2u嘉泰姆
The EN pin should be connected a resistor divider from VIN to EN .After the VINP2u嘉泰姆
and EN voltages exceed their respective voltage thresholds, the IC starts aP2u嘉泰姆
start-up process and then ramps up the output voltage to the setting of outputP2u嘉泰姆
voltage.P2u嘉泰姆
Over-Temperature Protection (OTP)P2u嘉泰姆
The over-temperature circuit limits the junction tempera ture of the CXSD62159P2u嘉泰姆
When the junction temperature exceeds TJ =+160oC, a thermal sensor turnsP2u嘉泰姆
off the power MOSFET, allowing the device to cool down. The thermal sensorP2u嘉泰姆
allows the converter to start a start-up process and regulate the output voltageP2u嘉泰姆
again after the junction temperature cools by 50oC.The OTP designed with a 50 oCP2u嘉泰姆
hysteresis lowers the average T J during c ontinuous thermal overload conditions,P2u嘉泰姆
increasing life time of the IC.P2u嘉泰姆
Enable/ShutdownP2u嘉泰姆
Driving EN to ground places the CXSD62159 in shutdown.When in shutdown, theP2u嘉泰姆
internal N-Channel power MOSFET turns off, all internal circuitry shuts down andP2u嘉泰姆
the quiescent supply current reduces to 0.3μA.P2u嘉泰姆
Current-Limit ProtectionP2u嘉泰姆
The CXSD62159 monitors the output current, flowing through the N-Channel powerP2u嘉泰姆
MOSFET, and limits the IC from damages during overload, short-circuit and over-P2u嘉泰姆
voltage conditions. P2u嘉泰姆
Frequency FoldbackP2u嘉泰姆
The foldback frequency is controlled by the FB voltage.When the FB pin voltageP2u嘉泰姆
is under 0.6V, the frequency of the oscillator will be reduced to 110kHz. This lowerP2u嘉泰姆
frequency allows the inductor current to safely discharge,thereby preventing currentP2u嘉泰姆
runaway. The oscillator’s frequency will switch to its designed rate when the feedbackP2u嘉泰姆
voltage on FB rises above the rising frequency foldback threshold (0.6V, typical) again.P2u嘉泰姆
Over-Voltage ProtectionP2u嘉泰姆
The over-voltage function monitors the output voltage by FB pin. When the FB voltageP2u嘉泰姆
increase over 120% of the reference voltage, the over-voltage protection compara-P2u嘉泰姆
tor will force the high-and low-side MOSFET gate driver off. As soon as the outputP2u嘉泰姆
voltage is within regulation, the OVP comparator is disengaged. The chip will restore itsP2u嘉泰姆
normal operation.P2u嘉泰姆
二.产品特点(Features)P2u嘉泰姆
Wide Input Voltage from 4.5V to 24VP2u嘉泰姆
2A Continuous Output CurrentP2u嘉泰姆
Adjustable Output Voltage from 0.8V to 20VP2u嘉泰姆
Intergrated High/Low Side MOSFETP2u嘉泰姆
PFM/PWM mode OperationP2u嘉泰姆
Fixed 340kHz Switching FrequencyP2u嘉泰姆
Stable with Low ESR Ceramic Output CapacitorsP2u嘉泰姆
Power-On-Reset DetectionP2u嘉泰姆
Programmable Soft-StartP2u嘉泰姆
Over-Temperature ProtectionP2u嘉泰姆
Current-Limit Protection with Frequency FoldbackP2u嘉泰姆
Enable/Shutdown FunctionP2u嘉泰姆
Small TDFN3x3-10 PackagesP2u嘉泰姆
Lead Free and Green Devices Available (RoHS Compliant)P2u嘉泰姆
三,应用范围 (Applications) P2u嘉泰姆

LCD Monitor/TVP2u嘉泰姆

Set-Top BoxP2u嘉泰姆
DSL, Switch HUBP2u嘉泰姆
Notebook ComputerP2u嘉泰姆

四.下载产品资料PDF文档 P2u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！P2u嘉泰姆

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五,产品封装图 (Package)P2u嘉泰姆

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六.电路原理图P2u嘉泰姆

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Switching Regulator > Buck ConverterP2u嘉泰姆

 Part_No P2u嘉泰姆

 PackageP2u嘉泰姆

ArchitectuP2u嘉泰姆

No.ofP2u嘉泰姆

PWM P2u嘉泰姆

OutpuP2u嘉泰姆

DriveP2u嘉泰姆

LoutP2u嘉泰姆

(A) P2u嘉泰姆

Vin(V) P2u嘉泰姆

FmaxP2u嘉泰姆

Khz P2u嘉泰姆

Vref P2u嘉泰姆

(V) P2u嘉泰姆

R-Top (milohm) P2u嘉泰姆

R-Sync (milohm) P2u嘉泰姆

Iq (No load) (uA) P2u嘉泰姆

minP2u嘉泰姆

maxP2u嘉泰姆

CXSD62122P2u嘉泰姆

TQFN5x6-28P2u嘉泰姆

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1P2u嘉泰姆

5P2u嘉泰姆

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26P2u嘉泰姆

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0.8P2u嘉泰姆

50P2u嘉泰姆

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CXSD62123P2u嘉泰姆

SOP-8P2u嘉泰姆

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26P2u嘉泰姆

380P2u嘉泰姆

0.8P2u嘉泰姆

100P2u嘉泰姆

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1P2u嘉泰姆

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26P2u嘉泰姆

380P2u嘉泰姆

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CXSD62125P2u嘉泰姆

SOT23-5|TSOT23-5P2u嘉泰姆

CMP2u嘉泰姆

1P2u嘉泰姆

1P2u嘉泰姆

2.7P2u嘉泰姆

6P2u嘉泰姆

1500P2u嘉泰姆

0.6P2u嘉泰姆

280P2u嘉泰姆

250P2u嘉泰姆

25P2u嘉泰姆

CXSD62125AP2u嘉泰姆

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1P2u嘉泰姆

3P2u嘉泰姆

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0.8P2u嘉泰姆

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CXSD62127P2u嘉泰姆

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0.8P2u嘉泰姆

55P2u嘉泰姆

45P2u嘉泰姆

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CXSD62128BP2u嘉泰姆

TDFN3x3-10P2u嘉泰姆

3P2u嘉泰姆

2.6P2u嘉泰姆

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2000P2u嘉泰姆

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1500P2u嘉泰姆

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280P2u嘉泰姆

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CXSD62131P2u嘉泰姆

TDFN3x3-12P2u嘉泰姆

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1500P2u嘉泰姆

0.6P2u嘉泰姆

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