一,产品概述(General Description)         0FL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 area0FL嘉泰姆

Main Control Loop0FL嘉泰姆

        The CXSD62159 is a constant frequency current mode switching regulator.0FL嘉泰姆
During normal operation, the internal N-channel power MOSFET is turned on0FL嘉泰姆
each cycle when the oscillator sets an internal RS latch and would be turned0FL嘉泰姆
off when an internal current comparator (ICMP) resets the latch. The peak0FL嘉泰姆
inductor current at which ICMP resets the RS latch is controlled by the voltage0FL嘉泰姆
on the COMP pin, which is the output of the error amplifier (EAMP). An external0FL嘉泰姆
resistive divider connected between VOUT and ground allows the EAMP to0FL嘉泰姆
receive an output feedback voltage VFB at FB pin. When the load current0FL嘉泰姆
increases, it causes a slight decrease in VFB relative to the 0.8V reference,0FL嘉泰姆
which in turn causes the COMP voltage to increase until the average inductor0FL嘉泰姆
current matches the new load current.0FL嘉泰姆
VIN Power-On-Reset (POR) and EN Under-voltageLockout0FL嘉泰姆
The CXSD62159 keep monitoring the voltage on VIN pin to prevent wrong logic0FL嘉泰姆
operations which may occur when VIN voltage is not high enough for the internal0FL嘉泰姆
control circuitry to operate. The VIN POR has a rising threshold of 4.05V (typical)0FL嘉泰姆
with 0.3V of hysteresis.An external under-voltage lockout (UVLO) is sensed at0FL嘉泰姆
the EN pin. The EN UVLO has a rising threshold of 2.5V with 0.2V of hysteresis.0FL嘉泰姆
The EN pin should be connected a resistor divider from VIN to EN .After the VIN0FL嘉泰姆
and EN voltages exceed their respective voltage thresholds, the IC starts a0FL嘉泰姆
start-up process and then ramps up the output voltage to the setting of output0FL嘉泰姆
voltage.0FL嘉泰姆
Over-Temperature Protection (OTP)0FL嘉泰姆
The over-temperature circuit limits the junction tempera ture of the CXSD621590FL嘉泰姆
When the junction temperature exceeds TJ =+160oC, a thermal sensor turns0FL嘉泰姆
off the power MOSFET, allowing the device to cool down. The thermal sensor0FL嘉泰姆
allows the converter to start a start-up process and regulate the output voltage0FL嘉泰姆
again after the junction temperature cools by 50oC.The OTP designed with a 50 oC0FL嘉泰姆
hysteresis lowers the average T J during c ontinuous thermal overload conditions,0FL嘉泰姆
increasing life time of the IC.0FL嘉泰姆
Enable/Shutdown0FL嘉泰姆
Driving EN to ground places the CXSD62159 in shutdown.When in shutdown, the0FL嘉泰姆
internal N-Channel power MOSFET turns off, all internal circuitry shuts down and0FL嘉泰姆
the quiescent supply current reduces to 0.3μA.0FL嘉泰姆
Current-Limit Protection0FL嘉泰姆
The CXSD62159 monitors the output current, flowing through the N-Channel power0FL嘉泰姆
MOSFET, and limits the IC from damages during overload, short-circuit and over-0FL嘉泰姆
voltage conditions. 0FL嘉泰姆
Frequency Foldback0FL嘉泰姆
The foldback frequency is controlled by the FB voltage.When the FB pin voltage0FL嘉泰姆
is under 0.6V, the frequency of the oscillator will be reduced to 110kHz. This lower0FL嘉泰姆
frequency allows the inductor current to safely discharge,thereby preventing current0FL嘉泰姆
runaway. The oscillator’s frequency will switch to its designed rate when the feedback0FL嘉泰姆
voltage on FB rises above the rising frequency foldback threshold (0.6V, typical) again.0FL嘉泰姆
Over-Voltage Protection0FL嘉泰姆
The over-voltage function monitors the output voltage by FB pin. When the FB voltage0FL嘉泰姆
increase over 120% of the reference voltage, the over-voltage protection compara-0FL嘉泰姆
tor will force the high-and low-side MOSFET gate driver off. As soon as the output0FL嘉泰姆
voltage is within regulation, the OVP comparator is disengaged. The chip will restore its0FL嘉泰姆
normal operation.0FL嘉泰姆
二.产品特点(Features)0FL嘉泰姆
Wide Input Voltage from 4.5V to 24V0FL嘉泰姆
2A Continuous Output Current0FL嘉泰姆
Adjustable Output Voltage from 0.8V to 20V0FL嘉泰姆
Intergrated High/Low Side MOSFET0FL嘉泰姆
PFM/PWM mode Operation0FL嘉泰姆
Fixed 340kHz Switching Frequency0FL嘉泰姆
Stable with Low ESR Ceramic Output Capacitors0FL嘉泰姆
Power-On-Reset Detection0FL嘉泰姆
Programmable Soft-Start0FL嘉泰姆
Over-Temperature Protection0FL嘉泰姆
Current-Limit Protection with Frequency Foldback0FL嘉泰姆
Enable/Shutdown Function0FL嘉泰姆
Small TDFN3x3-10 Packages0FL嘉泰姆
Lead Free and Green Devices Available (RoHS Compliant)0FL嘉泰姆
三,应用范围 (Applications) 0FL嘉泰姆

LCD Monitor/TV0FL嘉泰姆

Set-Top Box0FL嘉泰姆
DSL, Switch HUB0FL嘉泰姆
Notebook Computer0FL嘉泰姆

四.下载产品资料PDF文档 0FL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！0FL嘉泰姆

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五,产品封装图 (Package)0FL嘉泰姆

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六.电路原理图0FL嘉泰姆

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Switching Regulator > Buck Converter0FL嘉泰姆

 Part_No 0FL嘉泰姆

 Package0FL嘉泰姆

Architectu0FL嘉泰姆

No.of0FL嘉泰姆

PWM 0FL嘉泰姆

Outpu0FL嘉泰姆

Drive0FL嘉泰姆

Lout0FL嘉泰姆

(A) 0FL嘉泰姆

Vin(V) 0FL嘉泰姆

Fmax0FL嘉泰姆

Khz 0FL嘉泰姆

Vref 0FL嘉泰姆

(V) 0FL嘉泰姆

R-Top (milohm) 0FL嘉泰姆

R-Sync (milohm) 0FL嘉泰姆

Iq (No load) (uA) 0FL嘉泰姆

min0FL嘉泰姆

max0FL嘉泰姆

CXSD621220FL嘉泰姆

TQFN5x6-280FL嘉泰姆

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CXSD621270FL嘉泰姆

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CXSD62128B0FL嘉泰姆

TDFN3x3-100FL嘉泰姆

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TDFN 3x3 120FL嘉泰姆

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