一,产品概述(General Description)         3sx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 area3sx嘉泰姆

Main Control Loop3sx嘉泰姆

        The CXSD62159 is a constant frequency current mode switching regulator.3sx嘉泰姆
During normal operation, the internal N-channel power MOSFET is turned on3sx嘉泰姆
each cycle when the oscillator sets an internal RS latch and would be turned3sx嘉泰姆
off when an internal current comparator (ICMP) resets the latch. The peak3sx嘉泰姆
inductor current at which ICMP resets the RS latch is controlled by the voltage3sx嘉泰姆
on the COMP pin, which is the output of the error amplifier (EAMP). An external3sx嘉泰姆
resistive divider connected between VOUT and ground allows the EAMP to3sx嘉泰姆
receive an output feedback voltage VFB at FB pin. When the load current3sx嘉泰姆
increases, it causes a slight decrease in VFB relative to the 0.8V reference,3sx嘉泰姆
which in turn causes the COMP voltage to increase until the average inductor3sx嘉泰姆
current matches the new load current.3sx嘉泰姆
VIN Power-On-Reset (POR) and EN Under-voltageLockout3sx嘉泰姆
The CXSD62159 keep monitoring the voltage on VIN pin to prevent wrong logic3sx嘉泰姆
operations which may occur when VIN voltage is not high enough for the internal3sx嘉泰姆
control circuitry to operate. The VIN POR has a rising threshold of 4.05V (typical)3sx嘉泰姆
with 0.3V of hysteresis.An external under-voltage lockout (UVLO) is sensed at3sx嘉泰姆
the EN pin. The EN UVLO has a rising threshold of 2.5V with 0.2V of hysteresis.3sx嘉泰姆
The EN pin should be connected a resistor divider from VIN to EN .After the VIN3sx嘉泰姆
and EN voltages exceed their respective voltage thresholds, the IC starts a3sx嘉泰姆
start-up process and then ramps up the output voltage to the setting of output3sx嘉泰姆
voltage.3sx嘉泰姆
Over-Temperature Protection (OTP)3sx嘉泰姆
The over-temperature circuit limits the junction tempera ture of the CXSD621593sx嘉泰姆
When the junction temperature exceeds TJ =+160oC, a thermal sensor turns3sx嘉泰姆
off the power MOSFET, allowing the device to cool down. The thermal sensor3sx嘉泰姆
allows the converter to start a start-up process and regulate the output voltage3sx嘉泰姆
again after the junction temperature cools by 50oC.The OTP designed with a 50 oC3sx嘉泰姆
hysteresis lowers the average T J during c ontinuous thermal overload conditions,3sx嘉泰姆
increasing life time of the IC.3sx嘉泰姆
Enable/Shutdown3sx嘉泰姆
Driving EN to ground places the CXSD62159 in shutdown.When in shutdown, the3sx嘉泰姆
internal N-Channel power MOSFET turns off, all internal circuitry shuts down and3sx嘉泰姆
the quiescent supply current reduces to 0.3μA.3sx嘉泰姆
Current-Limit Protection3sx嘉泰姆
The CXSD62159 monitors the output current, flowing through the N-Channel power3sx嘉泰姆
MOSFET, and limits the IC from damages during overload, short-circuit and over-3sx嘉泰姆
voltage conditions. 3sx嘉泰姆
Frequency Foldback3sx嘉泰姆
The foldback frequency is controlled by the FB voltage.When the FB pin voltage3sx嘉泰姆
is under 0.6V, the frequency of the oscillator will be reduced to 110kHz. This lower3sx嘉泰姆
frequency allows the inductor current to safely discharge,thereby preventing current3sx嘉泰姆
runaway. The oscillator’s frequency will switch to its designed rate when the feedback3sx嘉泰姆
voltage on FB rises above the rising frequency foldback threshold (0.6V, typical) again.3sx嘉泰姆
Over-Voltage Protection3sx嘉泰姆
The over-voltage function monitors the output voltage by FB pin. When the FB voltage3sx嘉泰姆
increase over 120% of the reference voltage, the over-voltage protection compara-3sx嘉泰姆
tor will force the high-and low-side MOSFET gate driver off. As soon as the output3sx嘉泰姆
voltage is within regulation, the OVP comparator is disengaged. The chip will restore its3sx嘉泰姆
normal operation.3sx嘉泰姆
二.产品特点(Features)3sx嘉泰姆
Wide Input Voltage from 4.5V to 24V3sx嘉泰姆
2A Continuous Output Current3sx嘉泰姆
Adjustable Output Voltage from 0.8V to 20V3sx嘉泰姆
Intergrated High/Low Side MOSFET3sx嘉泰姆
PFM/PWM mode Operation3sx嘉泰姆
Fixed 340kHz Switching Frequency3sx嘉泰姆
Stable with Low ESR Ceramic Output Capacitors3sx嘉泰姆
Power-On-Reset Detection3sx嘉泰姆
Programmable Soft-Start3sx嘉泰姆
Over-Temperature Protection3sx嘉泰姆
Current-Limit Protection with Frequency Foldback3sx嘉泰姆
Enable/Shutdown Function3sx嘉泰姆
Small TDFN3x3-10 Packages3sx嘉泰姆
Lead Free and Green Devices Available (RoHS Compliant)3sx嘉泰姆
三,应用范围 (Applications) 3sx嘉泰姆

LCD Monitor/TV3sx嘉泰姆

Set-Top Box3sx嘉泰姆
DSL, Switch HUB3sx嘉泰姆
Notebook Computer3sx嘉泰姆

四.下载产品资料PDF文档 3sx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！3sx嘉泰姆

 3sx嘉泰姆

 3sx嘉泰姆

五,产品封装图 (Package)3sx嘉泰姆

3sx嘉泰姆

六.电路原理图3sx嘉泰姆

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Switching Regulator > Buck Converter3sx嘉泰姆

 Part_No 3sx嘉泰姆

 Package3sx嘉泰姆

Architectu3sx嘉泰姆

No.of3sx嘉泰姆

PWM 3sx嘉泰姆

Outpu3sx嘉泰姆

Drive3sx嘉泰姆

Lout3sx嘉泰姆

(A) 3sx嘉泰姆

Vin(V) 3sx嘉泰姆

Fmax3sx嘉泰姆

Khz 3sx嘉泰姆

Vref 3sx嘉泰姆

(V) 3sx嘉泰姆

R-Top (milohm) 3sx嘉泰姆

R-Sync (milohm) 3sx嘉泰姆

Iq (No load) (uA) 3sx嘉泰姆

min3sx嘉泰姆

max3sx嘉泰姆

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53sx嘉泰姆

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