一,产品概述(General Description)         lhr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 arealhr嘉泰姆

Main Control Looplhr嘉泰姆

        The CXSD62159 is a constant frequency current mode switching regulator.lhr嘉泰姆
During normal operation, the internal N-channel power MOSFET is turned onlhr嘉泰姆
each cycle when the oscillator sets an internal RS latch and would be turnedlhr嘉泰姆
off when an internal current comparator (ICMP) resets the latch. The peaklhr嘉泰姆
inductor current at which ICMP resets the RS latch is controlled by the voltagelhr嘉泰姆
on the COMP pin, which is the output of the error amplifier (EAMP). An externallhr嘉泰姆
resistive divider connected between VOUT and ground allows the EAMP tolhr嘉泰姆
receive an output feedback voltage VFB at FB pin. When the load currentlhr嘉泰姆
increases, it causes a slight decrease in VFB relative to the 0.8V reference,lhr嘉泰姆
which in turn causes the COMP voltage to increase until the average inductorlhr嘉泰姆
current matches the new load current.lhr嘉泰姆
VIN Power-On-Reset (POR) and EN Under-voltageLockoutlhr嘉泰姆
The CXSD62159 keep monitoring the voltage on VIN pin to prevent wrong logiclhr嘉泰姆
operations which may occur when VIN voltage is not high enough for the internallhr嘉泰姆
control circuitry to operate. The VIN POR has a rising threshold of 4.05V (typical)lhr嘉泰姆
with 0.3V of hysteresis.An external under-voltage lockout (UVLO) is sensed atlhr嘉泰姆
the EN pin. The EN UVLO has a rising threshold of 2.5V with 0.2V of hysteresis.lhr嘉泰姆
The EN pin should be connected a resistor divider from VIN to EN .After the VINlhr嘉泰姆
and EN voltages exceed their respective voltage thresholds, the IC starts alhr嘉泰姆
start-up process and then ramps up the output voltage to the setting of outputlhr嘉泰姆
voltage.lhr嘉泰姆
Over-Temperature Protection (OTP)lhr嘉泰姆
The over-temperature circuit limits the junction tempera ture of the CXSD62159lhr嘉泰姆
When the junction temperature exceeds TJ =+160oC, a thermal sensor turnslhr嘉泰姆
off the power MOSFET, allowing the device to cool down. The thermal sensorlhr嘉泰姆
allows the converter to start a start-up process and regulate the output voltagelhr嘉泰姆
again after the junction temperature cools by 50oC.The OTP designed with a 50 oClhr嘉泰姆
hysteresis lowers the average T J during c ontinuous thermal overload conditions,lhr嘉泰姆
increasing life time of the IC.lhr嘉泰姆
Enable/Shutdownlhr嘉泰姆
Driving EN to ground places the CXSD62159 in shutdown.When in shutdown, thelhr嘉泰姆
internal N-Channel power MOSFET turns off, all internal circuitry shuts down andlhr嘉泰姆
the quiescent supply current reduces to 0.3μA.lhr嘉泰姆
Current-Limit Protectionlhr嘉泰姆
The CXSD62159 monitors the output current, flowing through the N-Channel powerlhr嘉泰姆
MOSFET, and limits the IC from damages during overload, short-circuit and over-lhr嘉泰姆
voltage conditions. lhr嘉泰姆
Frequency Foldbacklhr嘉泰姆
The foldback frequency is controlled by the FB voltage.When the FB pin voltagelhr嘉泰姆
is under 0.6V, the frequency of the oscillator will be reduced to 110kHz. This lowerlhr嘉泰姆
frequency allows the inductor current to safely discharge,thereby preventing currentlhr嘉泰姆
runaway. The oscillator’s frequency will switch to its designed rate when the feedbacklhr嘉泰姆
voltage on FB rises above the rising frequency foldback threshold (0.6V, typical) again.lhr嘉泰姆
Over-Voltage Protectionlhr嘉泰姆
The over-voltage function monitors the output voltage by FB pin. When the FB voltagelhr嘉泰姆
increase over 120% of the reference voltage, the over-voltage protection compara-lhr嘉泰姆
tor will force the high-and low-side MOSFET gate driver off. As soon as the outputlhr嘉泰姆
voltage is within regulation, the OVP comparator is disengaged. The chip will restore itslhr嘉泰姆
normal operation.lhr嘉泰姆
二.产品特点(Features)lhr嘉泰姆
Wide Input Voltage from 4.5V to 24Vlhr嘉泰姆
2A Continuous Output Currentlhr嘉泰姆
Adjustable Output Voltage from 0.8V to 20Vlhr嘉泰姆
Intergrated High/Low Side MOSFETlhr嘉泰姆
PFM/PWM mode Operationlhr嘉泰姆
Fixed 340kHz Switching Frequencylhr嘉泰姆
Stable with Low ESR Ceramic Output Capacitorslhr嘉泰姆
Power-On-Reset Detectionlhr嘉泰姆
Programmable Soft-Startlhr嘉泰姆
Over-Temperature Protectionlhr嘉泰姆
Current-Limit Protection with Frequency Foldbacklhr嘉泰姆
Enable/Shutdown Functionlhr嘉泰姆
Small TDFN3x3-10 Packageslhr嘉泰姆
Lead Free and Green Devices Available (RoHS Compliant)lhr嘉泰姆
三,应用范围 (Applications) lhr嘉泰姆

LCD Monitor/TVlhr嘉泰姆

Set-Top Boxlhr嘉泰姆
DSL, Switch HUBlhr嘉泰姆
Notebook Computerlhr嘉泰姆

四.下载产品资料PDF文档 lhr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！lhr嘉泰姆

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五,产品封装图 (Package)lhr嘉泰姆

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六.电路原理图lhr嘉泰姆

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Switching Regulator > Buck Converterlhr嘉泰姆

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