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)         uYV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 areauYV嘉泰姆

Main Control LoopuYV嘉泰姆

        The CXSD62159 is a constant frequency current mode switching regulator.uYV嘉泰姆
During normal operation, the internal N-channel power MOSFET is turned onuYV嘉泰姆
each cycle when the oscillator sets an internal RS latch and would be turneduYV嘉泰姆
off when an internal current comparator (ICMP) resets the latch. The peakuYV嘉泰姆
inductor current at which ICMP resets the RS latch is controlled by the voltageuYV嘉泰姆
on the COMP pin, which is the output of the error amplifier (EAMP). An externaluYV嘉泰姆
resistive divider connected between VOUT and ground allows the EAMP touYV嘉泰姆
receive an output feedback voltage VFB at FB pin. When the load currentuYV嘉泰姆
increases, it causes a slight decrease in VFB relative to the 0.8V reference,uYV嘉泰姆
which in turn causes the COMP voltage to increase until the average inductoruYV嘉泰姆
current matches the new load current.uYV嘉泰姆
VIN Power-On-Reset (POR) and EN Under-voltageLockoutuYV嘉泰姆
The CXSD62159 keep monitoring the voltage on VIN pin to prevent wrong logicuYV嘉泰姆
operations which may occur when VIN voltage is not high enough for the internaluYV嘉泰姆
control circuitry to operate. The VIN POR has a rising threshold of 4.05V (typical)uYV嘉泰姆
with 0.3V of hysteresis.An external under-voltage lockout (UVLO) is sensed atuYV嘉泰姆
the EN pin. The EN UVLO has a rising threshold of 2.5V with 0.2V of hysteresis.uYV嘉泰姆
The EN pin should be connected a resistor divider from VIN to EN .After the VINuYV嘉泰姆
and EN voltages exceed their respective voltage thresholds, the IC starts auYV嘉泰姆
start-up process and then ramps up the output voltage to the setting of outputuYV嘉泰姆
voltage.uYV嘉泰姆
Over-Temperature Protection (OTP)uYV嘉泰姆
The over-temperature circuit limits the junction tempera ture of the CXSD62159uYV嘉泰姆
When the junction temperature exceeds TJ =+160oC, a thermal sensor turnsuYV嘉泰姆
off the power MOSFET, allowing the device to cool down. The thermal sensoruYV嘉泰姆
allows the converter to start a start-up process and regulate the output voltageuYV嘉泰姆
again after the junction temperature cools by 50oC.The OTP designed with a 50 oCuYV嘉泰姆
hysteresis lowers the average T J during c ontinuous thermal overload conditions,uYV嘉泰姆
increasing life time of the IC.uYV嘉泰姆
Enable/ShutdownuYV嘉泰姆
Driving EN to ground places the CXSD62159 in shutdown.When in shutdown, theuYV嘉泰姆
internal N-Channel power MOSFET turns off, all internal circuitry shuts down anduYV嘉泰姆
the quiescent supply current reduces to 0.3μA.uYV嘉泰姆
Current-Limit ProtectionuYV嘉泰姆
The CXSD62159 monitors the output current, flowing through the N-Channel poweruYV嘉泰姆
MOSFET, and limits the IC from damages during overload, short-circuit and over-uYV嘉泰姆
voltage conditions. uYV嘉泰姆
Frequency FoldbackuYV嘉泰姆
The foldback frequency is controlled by the FB voltage.When the FB pin voltageuYV嘉泰姆
is under 0.6V, the frequency of the oscillator will be reduced to 110kHz. This loweruYV嘉泰姆
frequency allows the inductor current to safely discharge,thereby preventing currentuYV嘉泰姆
runaway. The oscillator’s frequency will switch to its designed rate when the feedbackuYV嘉泰姆
voltage on FB rises above the rising frequency foldback threshold (0.6V, typical) again.uYV嘉泰姆
Over-Voltage ProtectionuYV嘉泰姆
The over-voltage function monitors the output voltage by FB pin. When the FB voltageuYV嘉泰姆
increase over 120% of the reference voltage, the over-voltage protection compara-uYV嘉泰姆
tor will force the high-and low-side MOSFET gate driver off. As soon as the outputuYV嘉泰姆
voltage is within regulation, the OVP comparator is disengaged. The chip will restore itsuYV嘉泰姆
normal operation.uYV嘉泰姆
二.产品特点(Features)uYV嘉泰姆
Wide Input Voltage from 4.5V to 24VuYV嘉泰姆
2A Continuous Output CurrentuYV嘉泰姆
Adjustable Output Voltage from 0.8V to 20VuYV嘉泰姆
Intergrated High/Low Side MOSFETuYV嘉泰姆
PFM/PWM mode OperationuYV嘉泰姆
Fixed 340kHz Switching FrequencyuYV嘉泰姆
Stable with Low ESR Ceramic Output CapacitorsuYV嘉泰姆
Power-On-Reset DetectionuYV嘉泰姆
Programmable Soft-StartuYV嘉泰姆
Over-Temperature ProtectionuYV嘉泰姆
Current-Limit Protection with Frequency FoldbackuYV嘉泰姆
Enable/Shutdown FunctionuYV嘉泰姆
Small TDFN3x3-10 PackagesuYV嘉泰姆
Lead Free and Green Devices Available (RoHS Compliant)uYV嘉泰姆
三,应用范围 (Applications) uYV嘉泰姆

LCD Monitor/TVuYV嘉泰姆

Set-Top BoxuYV嘉泰姆
DSL, Switch HUBuYV嘉泰姆
Notebook ComputeruYV嘉泰姆

四.下载产品资料PDF文档 uYV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！uYV嘉泰姆

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五,产品封装图 (Package)uYV嘉泰姆

uYV嘉泰姆

六.电路原理图uYV嘉泰姆

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Switching Regulator > Buck ConverteruYV嘉泰姆

 Part_No uYV嘉泰姆

 PackageuYV嘉泰姆

ArchitectuuYV嘉泰姆

No.ofuYV嘉泰姆

PWM uYV嘉泰姆

OutpuuYV嘉泰姆

DriveuYV嘉泰姆

LoutuYV嘉泰姆

(A) uYV嘉泰姆

Vin(V) uYV嘉泰姆

FmaxuYV嘉泰姆

Khz uYV嘉泰姆

Vref uYV嘉泰姆

(V) uYV嘉泰姆

R-Top (milohm) uYV嘉泰姆

R-Sync (milohm) uYV嘉泰姆

Iq (No load) (uA) uYV嘉泰姆

minuYV嘉泰姆

maxuYV嘉泰姆

CXSD62122uYV嘉泰姆

TQFN5x6-28uYV嘉泰姆

CMuYV嘉泰姆

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4.5uYV嘉泰姆

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0.8uYV嘉泰姆

50uYV嘉泰姆

20uYV嘉泰姆

1000uYV嘉泰姆

CXSD62123uYV嘉泰姆

SOP-8uYV嘉泰姆

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2uYV嘉泰姆

4.5uYV嘉泰姆

26uYV嘉泰姆

380uYV嘉泰姆

0.8uYV嘉泰姆

100uYV嘉泰姆

1000uYV嘉泰姆

CXSD62124uYV嘉泰姆

SOP-8PuYV嘉泰姆

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1uYV嘉泰姆

4uYV嘉泰姆

4.5uYV嘉泰姆

26uYV嘉泰姆

380uYV嘉泰姆

0.8uYV嘉泰姆

80uYV嘉泰姆

1000uYV嘉泰姆

CXSD62125uYV嘉泰姆

SOT23-5|TSOT23-5uYV嘉泰姆

CMuYV嘉泰姆

1uYV嘉泰姆

1uYV嘉泰姆

2.7uYV嘉泰姆

6uYV嘉泰姆

1500uYV嘉泰姆

0.6uYV嘉泰姆

280uYV嘉泰姆

250uYV嘉泰姆

25uYV嘉泰姆

CXSD62125AuYV嘉泰姆

SOT23-5uYV嘉泰姆

CMuYV嘉泰姆

1uYV嘉泰姆

1uYV嘉泰姆

2.7uYV嘉泰姆

6uYV嘉泰姆

1500uYV嘉泰姆

0.6uYV嘉泰姆

280uYV嘉泰姆

250uYV嘉泰姆

CXSD62126uYV嘉泰姆

SOP-8uYV嘉泰姆

CMuYV嘉泰姆

1uYV嘉泰姆

3uYV嘉泰姆

4.3uYV嘉泰姆

14uYV嘉泰姆

500uYV嘉泰姆

0.8uYV嘉泰姆

70uYV嘉泰姆

70uYV嘉泰姆

500uYV嘉泰姆

CXSD62127uYV嘉泰姆

SOP-8PuYV嘉泰姆

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1uYV嘉泰姆

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4.3uYV嘉泰姆

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0.8uYV嘉泰姆

55uYV嘉泰姆

45uYV嘉泰姆

500uYV嘉泰姆

CXSD62128BuYV嘉泰姆

TDFN3x3-10uYV嘉泰姆

3uYV嘉泰姆

2.6uYV嘉泰姆

5.5uYV嘉泰姆

2000uYV嘉泰姆

0.8uYV嘉泰姆

110uYV嘉泰姆

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460uYV嘉泰姆

CXSD62129uYV嘉泰姆

TDFN3x3-10uYV嘉泰姆

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280uYV嘉泰姆

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CXSD62129AuYV嘉泰姆

TDFN3x3-10uYV嘉泰姆

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1500uYV嘉泰姆

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CXSD62130uYV嘉泰姆

TDFN2x2-6uYV嘉泰姆

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1uYV嘉泰姆

1uYV嘉泰姆

2.7uYV嘉泰姆

6uYV嘉泰姆

1500uYV嘉泰姆

0.6uYV嘉泰姆

280uYV嘉泰姆

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CXSD62130AuYV嘉泰姆

TDFN2x2-6uYV嘉泰姆

CMuYV嘉泰姆

1uYV嘉泰姆

1uYV嘉泰姆

2.7uYV嘉泰姆

6uYV嘉泰姆

1500uYV嘉泰姆

0.6uYV嘉泰姆

280uYV嘉泰姆

250uYV嘉泰姆

CXSD62131uYV嘉泰姆

TDFN3x3-12uYV嘉泰姆

CMuYV嘉泰姆

2uYV嘉泰姆

1uYV嘉泰姆

2.7uYV嘉泰姆

6uYV嘉泰姆

1500uYV嘉泰姆

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280uYV嘉泰姆

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25uYV嘉泰姆

CXSD62131AuYV嘉泰姆

TDFN3x3-12uYV嘉泰姆

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2.7uYV嘉泰姆

6uYV嘉泰姆

1500uYV嘉泰姆

0.6uYV嘉泰姆

280uYV嘉泰姆

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CXSD62131CuYV嘉泰姆

TDFN 3x3 12uYV嘉泰姆

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1uYV嘉泰姆

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0.6uYV嘉泰姆

280uYV嘉泰姆

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CXSD62132uYV嘉泰姆

TQFN3x3-20uYV嘉泰姆

CMuYV嘉泰姆

3uYV嘉泰姆

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2.9uYV嘉泰姆

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-uYV嘉泰姆

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CXSD62133uYV嘉泰姆

TDFN2x2-8uYV嘉泰姆

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0.6uYV嘉泰姆

280uYV嘉泰姆

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CXSD62134uYV嘉泰姆

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110uYV嘉泰姆

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1900uYV嘉泰姆

CXSD62135uYV嘉泰姆

SOP-8PuYV嘉泰姆