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

发布时间:2020-04-29 17:48:06 浏览次数:324 作者:oumao18 来源:嘉泰姆
摘要:CXSD62159是一款集成了功率mosfet的2A同步降压变换器。设计采用电流模式控制方案,可将4.5V至24V的宽输入电压转换为0可调的输出电压。8V至20V,提供出色的输出电压调节。配备了自动PFM/PWM模式操作。在轻载时,集成电路以PFM模式工作以减少开关损耗。在大负载下,芯片工作在PWM模式
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

1.产品概述                       2.产品特点8rG嘉泰姆
3.应用范围                       4.下载产品资料PDF文档 8rG嘉泰姆
5.产品封装图                     6.电路原理图                   8rG嘉泰姆
7.功能概述                        8.相关产品8rG嘉泰姆

一,产品概述(General Description)         8rG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 area8rG嘉泰姆

Main Control Loop8rG嘉泰姆

        The CXSD62159 is a constant frequency current mode switching regulator.8rG嘉泰姆
During normal operation, the internal N-channel power MOSFET is turned on8rG嘉泰姆
each cycle when the oscillator sets an internal RS latch and would be turned8rG嘉泰姆
off when an internal current comparator (ICMP) resets the latch. The peak8rG嘉泰姆
inductor current at which ICMP resets the RS latch is controlled by the voltage8rG嘉泰姆
on the COMP pin, which is the output of the error amplifier (EAMP). An external8rG嘉泰姆
resistive divider connected between VOUT and ground allows the EAMP to8rG嘉泰姆
receive an output feedback voltage VFB at FB pin. When the load current8rG嘉泰姆
increases, it causes a slight decrease in VFB relative to the 0.8V reference,8rG嘉泰姆
which in turn causes the COMP voltage to increase until the average inductor8rG嘉泰姆
current matches the new load current.8rG嘉泰姆
VIN Power-On-Reset (POR) and EN Under-voltageLockout8rG嘉泰姆
The CXSD62159 keep monitoring the voltage on VIN pin to prevent wrong logic8rG嘉泰姆
operations which may occur when VIN voltage is not high enough for the internal8rG嘉泰姆
control circuitry to operate. The VIN POR has a rising threshold of 4.05V (typical)8rG嘉泰姆
with 0.3V of hysteresis.An external under-voltage lockout (UVLO) is sensed at8rG嘉泰姆
the EN pin. The EN UVLO has a rising threshold of 2.5V with 0.2V of hysteresis.8rG嘉泰姆
The EN pin should be connected a resistor divider from VIN to EN .After the VIN8rG嘉泰姆
and EN voltages exceed their respective voltage thresholds, the IC starts a8rG嘉泰姆
start-up process and then ramps up the output voltage to the setting of output8rG嘉泰姆
voltage.8rG嘉泰姆
Over-Temperature Protection (OTP)8rG嘉泰姆
The over-temperature circuit limits the junction tempera ture of the CXSD621598rG嘉泰姆
When the junction temperature exceeds TJ =+160oC, a thermal sensor turns8rG嘉泰姆
off the power MOSFET, allowing the device to cool down. The thermal sensor8rG嘉泰姆
allows the converter to start a start-up process and regulate the output voltage8rG嘉泰姆
again after the junction temperature cools by 50oC.The OTP designed with a 50 oC8rG嘉泰姆
hysteresis lowers the average T J during c ontinuous thermal overload conditions,8rG嘉泰姆
increasing life time of the IC.8rG嘉泰姆
Enable/Shutdown8rG嘉泰姆
Driving EN to ground places the CXSD62159 in shutdown.When in shutdown, the8rG嘉泰姆
internal N-Channel power MOSFET turns off, all internal circuitry shuts down and8rG嘉泰姆
the quiescent supply current reduces to 0.3μA.8rG嘉泰姆
Current-Limit Protection8rG嘉泰姆
The CXSD62159 monitors the output current, flowing through the N-Channel power8rG嘉泰姆
MOSFET, and limits the IC from damages during overload, short-circuit and over-8rG嘉泰姆
voltage conditions. 8rG嘉泰姆
Frequency Foldback8rG嘉泰姆
The foldback frequency is controlled by the FB voltage.When the FB pin voltage8rG嘉泰姆
is under 0.6V, the frequency of the oscillator will be reduced to 110kHz. This lower8rG嘉泰姆
frequency allows the inductor current to safely discharge,thereby preventing current8rG嘉泰姆
runaway. The oscillator’s frequency will switch to its designed rate when the feedback8rG嘉泰姆
voltage on FB rises above the rising frequency foldback threshold (0.6V, typical) again.8rG嘉泰姆
Over-Voltage Protection8rG嘉泰姆
The over-voltage function monitors the output voltage by FB pin. When the FB voltage8rG嘉泰姆
increase over 120% of the reference voltage, the over-voltage protection compara-8rG嘉泰姆
tor will force the high-and low-side MOSFET gate driver off. As soon as the output8rG嘉泰姆
voltage is within regulation, the OVP comparator is disengaged. The chip will restore its8rG嘉泰姆
normal operation.8rG嘉泰姆
二.产品特点(Features)8rG嘉泰姆
Wide Input Voltage from 4.5V to 24V8rG嘉泰姆
2A Continuous Output Current8rG嘉泰姆
Adjustable Output Voltage from 0.8V to 20V8rG嘉泰姆
Intergrated High/Low Side MOSFET8rG嘉泰姆
PFM/PWM mode Operation8rG嘉泰姆
Fixed 340kHz Switching Frequency8rG嘉泰姆
Stable with Low ESR Ceramic Output Capacitors8rG嘉泰姆
Power-On-Reset Detection8rG嘉泰姆
Programmable Soft-Start8rG嘉泰姆
Over-Temperature Protection8rG嘉泰姆
Current-Limit Protection with Frequency Foldback8rG嘉泰姆
Enable/Shutdown Function8rG嘉泰姆
Small TDFN3x3-10 Packages8rG嘉泰姆
Lead Free and Green Devices Available (RoHS Compliant)8rG嘉泰姆
三,应用范围 (Applications) 8rG嘉泰姆

LCD Monitor/TV8rG嘉泰姆

Set-Top Box8rG嘉泰姆
DSL, Switch HUB8rG嘉泰姆
Notebook Computer8rG嘉泰姆

四.下载产品资料PDF文档 8rG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8rG嘉泰姆

 QQ截图20160419174301.jpg8rG嘉泰姆

 8rG嘉泰姆

五,产品封装图 (Package)8rG嘉泰姆

blob.png8rG嘉泰姆

六.电路原理图8rG嘉泰姆

blob.png8rG嘉泰姆

七,功能概述8rG嘉泰姆


CXSD62159 is a 2A synchronous buck converter with integrated power MOSFETs. The CXSD62159 design with a cur-8rG嘉泰姆

rent-mode control scheme, can convert wide input voltage of 4.5V to 24V to the output voltage adjustable from 0.8rG嘉泰姆
8V to 20V to provide excellent output voltage regulation.The CXSD62159 is equipped with an automatic PFM/PWM8rG嘉泰姆
mode operation. At light load, the IC operates in the PFM mode to reduce the switching losses. At heavy load, the8rG嘉泰姆
IC works in PWM.8rG嘉泰姆
The CXSD62159 is also equipped with Power-on-reset, softstart, soft-stop, and whole protections (under-voltage,8rG嘉泰姆
over-temperature, and current-limit) into a single package.This device, available TDFN3x3-10, provides a very com-8rG嘉泰姆
pact system solution external components and PCB area8rG嘉泰姆
八,相关产品            更多同类产品.......8rG嘉泰姆


Switching Regulator > Buck Converter8rG嘉泰姆

 Part_No 8rG嘉泰姆

 Package8rG嘉泰姆

Architectu8rG嘉泰姆

No.of8rG嘉泰姆

PWM 8rG嘉泰姆

Outpu8rG嘉泰姆

Drive8rG嘉泰姆

Lout8rG嘉泰姆

(A) 8rG嘉泰姆

Vin(V) 8rG嘉泰姆

Fmax8rG嘉泰姆

Khz 8rG嘉泰姆

Vref 8rG嘉泰姆

(V) 8rG嘉泰姆

R-Top (milohm) 8rG嘉泰姆

R-Sync (milohm) 8rG嘉泰姆

Iq (No load) (uA) 8rG嘉泰姆

min8rG嘉泰姆

max8rG嘉泰姆

CXSD621228rG嘉泰姆

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2808rG嘉泰姆

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28rG嘉泰姆

18rG嘉泰姆

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2808rG嘉泰姆

2508rG嘉泰姆

 

CXSD62131C8rG嘉泰姆

TDFN 3x3 128rG嘉泰姆

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