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)         Cqj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 areaCqj嘉泰姆

Main Control LoopCqj嘉泰姆

        The CXSD62159 is a constant frequency current mode switching regulator.Cqj嘉泰姆
During normal operation, the internal N-channel power MOSFET is turned onCqj嘉泰姆
each cycle when the oscillator sets an internal RS latch and would be turnedCqj嘉泰姆
off when an internal current comparator (ICMP) resets the latch. The peakCqj嘉泰姆
inductor current at which ICMP resets the RS latch is controlled by the voltageCqj嘉泰姆
on the COMP pin, which is the output of the error amplifier (EAMP). An externalCqj嘉泰姆
resistive divider connected between VOUT and ground allows the EAMP toCqj嘉泰姆
receive an output feedback voltage VFB at FB pin. When the load currentCqj嘉泰姆
increases, it causes a slight decrease in VFB relative to the 0.8V reference,Cqj嘉泰姆
which in turn causes the COMP voltage to increase until the average inductorCqj嘉泰姆
current matches the new load current.Cqj嘉泰姆
VIN Power-On-Reset (POR) and EN Under-voltageLockoutCqj嘉泰姆
The CXSD62159 keep monitoring the voltage on VIN pin to prevent wrong logicCqj嘉泰姆
operations which may occur when VIN voltage is not high enough for the internalCqj嘉泰姆
control circuitry to operate. The VIN POR has a rising threshold of 4.05V (typical)Cqj嘉泰姆
with 0.3V of hysteresis.An external under-voltage lockout (UVLO) is sensed atCqj嘉泰姆
the EN pin. The EN UVLO has a rising threshold of 2.5V with 0.2V of hysteresis.Cqj嘉泰姆
The EN pin should be connected a resistor divider from VIN to EN .After the VINCqj嘉泰姆
and EN voltages exceed their respective voltage thresholds, the IC starts aCqj嘉泰姆
start-up process and then ramps up the output voltage to the setting of outputCqj嘉泰姆
voltage.Cqj嘉泰姆
Over-Temperature Protection (OTP)Cqj嘉泰姆
The over-temperature circuit limits the junction tempera ture of the CXSD62159Cqj嘉泰姆
When the junction temperature exceeds TJ =+160oC, a thermal sensor turnsCqj嘉泰姆
off the power MOSFET, allowing the device to cool down. The thermal sensorCqj嘉泰姆
allows the converter to start a start-up process and regulate the output voltageCqj嘉泰姆
again after the junction temperature cools by 50oC.The OTP designed with a 50 oCCqj嘉泰姆
hysteresis lowers the average T J during c ontinuous thermal overload conditions,Cqj嘉泰姆
increasing life time of the IC.Cqj嘉泰姆
Enable/ShutdownCqj嘉泰姆
Driving EN to ground places the CXSD62159 in shutdown.When in shutdown, theCqj嘉泰姆
internal N-Channel power MOSFET turns off, all internal circuitry shuts down andCqj嘉泰姆
the quiescent supply current reduces to 0.3μA.Cqj嘉泰姆
Current-Limit ProtectionCqj嘉泰姆
The CXSD62159 monitors the output current, flowing through the N-Channel powerCqj嘉泰姆
MOSFET, and limits the IC from damages during overload, short-circuit and over-Cqj嘉泰姆
voltage conditions. Cqj嘉泰姆
Frequency FoldbackCqj嘉泰姆
The foldback frequency is controlled by the FB voltage.When the FB pin voltageCqj嘉泰姆
is under 0.6V, the frequency of the oscillator will be reduced to 110kHz. This lowerCqj嘉泰姆
frequency allows the inductor current to safely discharge,thereby preventing currentCqj嘉泰姆
runaway. The oscillator’s frequency will switch to its designed rate when the feedbackCqj嘉泰姆
voltage on FB rises above the rising frequency foldback threshold (0.6V, typical) again.Cqj嘉泰姆
Over-Voltage ProtectionCqj嘉泰姆
The over-voltage function monitors the output voltage by FB pin. When the FB voltageCqj嘉泰姆
increase over 120% of the reference voltage, the over-voltage protection compara-Cqj嘉泰姆
tor will force the high-and low-side MOSFET gate driver off. As soon as the outputCqj嘉泰姆
voltage is within regulation, the OVP comparator is disengaged. The chip will restore itsCqj嘉泰姆
normal operation.Cqj嘉泰姆
二.产品特点(Features)Cqj嘉泰姆
Wide Input Voltage from 4.5V to 24VCqj嘉泰姆
2A Continuous Output CurrentCqj嘉泰姆
Adjustable Output Voltage from 0.8V to 20VCqj嘉泰姆
Intergrated High/Low Side MOSFETCqj嘉泰姆
PFM/PWM mode OperationCqj嘉泰姆
Fixed 340kHz Switching FrequencyCqj嘉泰姆
Stable with Low ESR Ceramic Output CapacitorsCqj嘉泰姆
Power-On-Reset DetectionCqj嘉泰姆
Programmable Soft-StartCqj嘉泰姆
Over-Temperature ProtectionCqj嘉泰姆
Current-Limit Protection with Frequency FoldbackCqj嘉泰姆
Enable/Shutdown FunctionCqj嘉泰姆
Small TDFN3x3-10 PackagesCqj嘉泰姆
Lead Free and Green Devices Available (RoHS Compliant)Cqj嘉泰姆
三,应用范围 (Applications) Cqj嘉泰姆

LCD Monitor/TVCqj嘉泰姆

Set-Top BoxCqj嘉泰姆
DSL, Switch HUBCqj嘉泰姆
Notebook ComputerCqj嘉泰姆

四.下载产品资料PDF文档 Cqj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！Cqj嘉泰姆

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五,产品封装图 (Package)Cqj嘉泰姆

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六.电路原理图Cqj嘉泰姆

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Switching Regulator > Buck ConverterCqj嘉泰姆

 Part_No Cqj嘉泰姆

 PackageCqj嘉泰姆

ArchitectuCqj嘉泰姆

No.ofCqj嘉泰姆

PWM Cqj嘉泰姆

OutpuCqj嘉泰姆

DriveCqj嘉泰姆

LoutCqj嘉泰姆

(A) Cqj嘉泰姆

Vin(V) Cqj嘉泰姆

FmaxCqj嘉泰姆

Khz Cqj嘉泰姆

Vref Cqj嘉泰姆

(V) Cqj嘉泰姆

R-Top (milohm) Cqj嘉泰姆

R-Sync (milohm) Cqj嘉泰姆

Iq (No load) (uA) Cqj嘉泰姆

minCqj嘉泰姆

maxCqj嘉泰姆

CXSD62122Cqj嘉泰姆

TQFN5x6-28Cqj嘉泰姆

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5Cqj嘉泰姆

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SOT23-5|TSOT23-5Cqj嘉泰姆

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70Cqj嘉泰姆

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1500Cqj嘉泰姆

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280Cqj嘉泰姆

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