一,产品概述(General Description)         oVn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 areaoVn嘉泰姆

Main Control LoopoVn嘉泰姆

        The CXSD62159 is a constant frequency current mode switching regulator.oVn嘉泰姆
During normal operation, the internal N-channel power MOSFET is turned onoVn嘉泰姆
each cycle when the oscillator sets an internal RS latch and would be turnedoVn嘉泰姆
off when an internal current comparator (ICMP) resets the latch. The peakoVn嘉泰姆
inductor current at which ICMP resets the RS latch is controlled by the voltageoVn嘉泰姆
on the COMP pin, which is the output of the error amplifier (EAMP). An externaloVn嘉泰姆
resistive divider connected between VOUT and ground allows the EAMP tooVn嘉泰姆
receive an output feedback voltage VFB at FB pin. When the load currentoVn嘉泰姆
increases, it causes a slight decrease in VFB relative to the 0.8V reference,oVn嘉泰姆
which in turn causes the COMP voltage to increase until the average inductoroVn嘉泰姆
current matches the new load current.oVn嘉泰姆
VIN Power-On-Reset (POR) and EN Under-voltageLockoutoVn嘉泰姆
The CXSD62159 keep monitoring the voltage on VIN pin to prevent wrong logicoVn嘉泰姆
operations which may occur when VIN voltage is not high enough for the internaloVn嘉泰姆
control circuitry to operate. The VIN POR has a rising threshold of 4.05V (typical)oVn嘉泰姆
with 0.3V of hysteresis.An external under-voltage lockout (UVLO) is sensed atoVn嘉泰姆
the EN pin. The EN UVLO has a rising threshold of 2.5V with 0.2V of hysteresis.oVn嘉泰姆
The EN pin should be connected a resistor divider from VIN to EN .After the VINoVn嘉泰姆
and EN voltages exceed their respective voltage thresholds, the IC starts aoVn嘉泰姆
start-up process and then ramps up the output voltage to the setting of outputoVn嘉泰姆
voltage.oVn嘉泰姆
Over-Temperature Protection (OTP)oVn嘉泰姆
The over-temperature circuit limits the junction tempera ture of the CXSD62159oVn嘉泰姆
When the junction temperature exceeds TJ =+160oC, a thermal sensor turnsoVn嘉泰姆
off the power MOSFET, allowing the device to cool down. The thermal sensoroVn嘉泰姆
allows the converter to start a start-up process and regulate the output voltageoVn嘉泰姆
again after the junction temperature cools by 50oC.The OTP designed with a 50 oCoVn嘉泰姆
hysteresis lowers the average T J during c ontinuous thermal overload conditions,oVn嘉泰姆
increasing life time of the IC.oVn嘉泰姆
Enable/ShutdownoVn嘉泰姆
Driving EN to ground places the CXSD62159 in shutdown.When in shutdown, theoVn嘉泰姆
internal N-Channel power MOSFET turns off, all internal circuitry shuts down andoVn嘉泰姆
the quiescent supply current reduces to 0.3μA.oVn嘉泰姆
Current-Limit ProtectionoVn嘉泰姆
The CXSD62159 monitors the output current, flowing through the N-Channel poweroVn嘉泰姆
MOSFET, and limits the IC from damages during overload, short-circuit and over-oVn嘉泰姆
voltage conditions. oVn嘉泰姆
Frequency FoldbackoVn嘉泰姆
The foldback frequency is controlled by the FB voltage.When the FB pin voltageoVn嘉泰姆
is under 0.6V, the frequency of the oscillator will be reduced to 110kHz. This loweroVn嘉泰姆
frequency allows the inductor current to safely discharge,thereby preventing currentoVn嘉泰姆
runaway. The oscillator’s frequency will switch to its designed rate when the feedbackoVn嘉泰姆
voltage on FB rises above the rising frequency foldback threshold (0.6V, typical) again.oVn嘉泰姆
Over-Voltage ProtectionoVn嘉泰姆
The over-voltage function monitors the output voltage by FB pin. When the FB voltageoVn嘉泰姆
increase over 120% of the reference voltage, the over-voltage protection compara-oVn嘉泰姆
tor will force the high-and low-side MOSFET gate driver off. As soon as the outputoVn嘉泰姆
voltage is within regulation, the OVP comparator is disengaged. The chip will restore itsoVn嘉泰姆
normal operation.oVn嘉泰姆
二.产品特点(Features)oVn嘉泰姆
Wide Input Voltage from 4.5V to 24VoVn嘉泰姆
2A Continuous Output CurrentoVn嘉泰姆
Adjustable Output Voltage from 0.8V to 20VoVn嘉泰姆
Intergrated High/Low Side MOSFEToVn嘉泰姆
PFM/PWM mode OperationoVn嘉泰姆
Fixed 340kHz Switching FrequencyoVn嘉泰姆
Stable with Low ESR Ceramic Output CapacitorsoVn嘉泰姆
Power-On-Reset DetectionoVn嘉泰姆
Programmable Soft-StartoVn嘉泰姆
Over-Temperature ProtectionoVn嘉泰姆
Current-Limit Protection with Frequency FoldbackoVn嘉泰姆
Enable/Shutdown FunctionoVn嘉泰姆
Small TDFN3x3-10 PackagesoVn嘉泰姆
Lead Free and Green Devices Available (RoHS Compliant)oVn嘉泰姆
三,应用范围 (Applications) oVn嘉泰姆

LCD Monitor/TVoVn嘉泰姆

Set-Top BoxoVn嘉泰姆
DSL, Switch HUBoVn嘉泰姆
Notebook ComputeroVn嘉泰姆

四.下载产品资料PDF文档 oVn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！oVn嘉泰姆

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五,产品封装图 (Package)oVn嘉泰姆

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六.电路原理图oVn嘉泰姆

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Switching Regulator > Buck ConverteroVn嘉泰姆

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