1.产品概述                       2.产品特点P8h嘉泰姆
3.应用范围                       4.下载产品资料PDF文档 P8h嘉泰姆
5.产品封装图                     6.电路原理图                   P8h嘉泰姆
7.功能概述                        8.相关产品P8h嘉泰姆

七,功能概述P8h嘉泰姆

VCC and VIN Power-On-Reset (POR)P8h嘉泰姆
TThe CXSD62152/A keeps monitoring the voltage on VIN and VCC pins to prevent wrong logic operations whichP8h嘉泰姆
may occur when VIN or VCC voltage is not high enough for internal control circuitry to operate. The VCC POR ris-P8h嘉泰姆
ing threshold is 2.7V (typical) with 0.2V hysteresis and VIN POR rising threshold is 2.3V with 0.05V hysteresis.P8h嘉泰姆
During startup, the VCC and VIN voltage must exceed the POR threshold. Then the IC starts a starts-up processP8h嘉泰姆
and ramps up the output voltage to the voltage target. P8h嘉泰姆
Output Under-Voltage Protection (UVP)P8h嘉泰姆
In the operational process, if a short-circuit occurs, the output voltage will drop quickly. Before the current-limitP8h嘉泰姆
circuit responds, the output voltage will fall out of the required regulation range. The under-voltage continuallyP8h嘉泰姆
monitors the FB voltage after soft-start is completed. If a load step is strong enough to pull the output voltage lowerP8h嘉泰姆
than the under-voltage threshold, the IC shuts down converter’s output.The under-voltage threshold is 50% of theP8h嘉泰姆
nominal out put voltage. The under-voltage comparator has a built-in 3μs noise filter to prevent the chips from wrongP8h嘉泰姆
UVP shut down being caused by noise. The CXSD62152/A will be latched after under-voltage protection.P8h嘉泰姆
Over-Voltage Protection (OVP)P8h嘉泰姆
The over-voltage function monitors the output voltage by FB pin. When the FB voltage increases over 125% of theP8h嘉泰姆
reference voltage due to the high-side MOSFET failure or for other reasons, the over-voltage protection comparatorP8h嘉泰姆
will force the low-side MOSFET gate driver high till the occurence of low-side current limit. This action activelyP8h嘉泰姆
pulls down the output voltage. As soon as the output voltage is less than 0.2V, the CXSD62152/A will be latched offP8h嘉泰姆
and needs a POR or enable to recover to normal operation.P8h嘉泰姆
Over-Temperature Protection (OTP)P8h嘉泰姆
The over-temperature circuit limits the junction tempera ture of the CXSD62152/A. When the junction temperatureP8h嘉泰姆
exceeds TJ = 160oC, a thermal sensor turns off the both power MOSFETs, allowing the devices to cool.P8h嘉泰姆
The thermal sensor allows the converters to start a start up process and to regulate the output voltage again afterP8h嘉泰姆
the junction temperature cools by 50oC. The OTP is designed with a 50oC hysteresis to lower the average TJP8h嘉泰姆
during continuous thermal overload conditions, increasing lifetime of the CXSD62152/A.P8h嘉泰姆
Current-Limit Protection P8h嘉泰姆
The CXSD62152/A monitors the output current, flows through the high-side and low-side power MOSFETs, and limitsP8h嘉泰姆
the current peak at current-limit level to prevent the IC from damaging during overload, short-circuit and over-P8h嘉泰姆
voltage conditions. Typical high side power MOSFET current limit is 3A, and low side MOSFET current limit is 1.9A.P8h嘉泰姆
 Soft-StartP8h嘉泰姆
The CXSD62152/A has a built-in soft-start to control the rise rate of the output voltage and limit the input current surgeP8h嘉泰姆
during start-up. During soft-start, an internal voltage ramp connected to one of the positive inputs of the errorP8h嘉泰姆
amplifier, rises up from 0V to 0.95V to replace the reference voltage (0.8V) until the voltage ramp reaches theP8h嘉泰姆
reference voltage. During soft-start without output overvoltage, the CXSD62152/A converter¡|s sinking capability isP8h嘉泰姆
disabled until the output voltage reaches the voltage target.P8h嘉泰姆
Soft-StopP8h嘉泰姆
At the moment of shutdown controlled by EN signal, under-voltage event or over-temperature protection, theCXSD62152/A initiates a soft-stop process to discharge the output voltage in the output capacitors. Certainly, the loadP8h嘉泰姆
current also discharges the output voltage. During softstop, the internal voltage ramp (VRAMP) falls down from 0.P8h嘉泰姆
95V to 0V to replace the reference voltage. Therefore, the output voltage falls down slowly at the light load. After theP8h嘉泰姆
soft-stop interval elapses, the soft-stop process ends and the IC turns on the low-side power MOSFET.P8h嘉泰姆
八,相关产品                更多同类产品.......P8h嘉泰姆

Switching Regulator > Buck ConverterP8h嘉泰姆
Part_No P8h嘉泰姆	PackageP8h嘉泰姆	ArchitectuP8h嘉泰姆	No.ofP8h嘉泰姆 PWM P8h嘉泰姆 OutpuP8h嘉泰姆	DriveP8h嘉泰姆 LoutP8h嘉泰姆 (A) P8h嘉泰姆	Vin(V) P8h嘉泰姆		FmaxP8h嘉泰姆 Khz P8h嘉泰姆	Vref P8h嘉泰姆 (V) P8h嘉泰姆	R-Top (milohm) P8h嘉泰姆	R-Sync (milohm) P8h嘉泰姆	Iq (No load) (uA) P8h嘉泰姆
					minP8h嘉泰姆	maxP8h嘉泰姆
CXSD62122P8h嘉泰姆	TQFN5x6-28P8h嘉泰姆	CMP8h嘉泰姆	1P8h嘉泰姆	5P8h嘉泰姆	4.5P8h嘉泰姆	26P8h嘉泰姆	380P8h嘉泰姆	0.8P8h嘉泰姆	50P8h嘉泰姆	20P8h嘉泰姆	1000P8h嘉泰姆
CXSD62123P8h嘉泰姆	SOP-8P8h嘉泰姆	CMP8h嘉泰姆	1P8h嘉泰姆	2P8h嘉泰姆	4.5P8h嘉泰姆	26P8h嘉泰姆	380P8h嘉泰姆	0.8P8h嘉泰姆	100P8h嘉泰姆		1000P8h嘉泰姆
CXSD62124P8h嘉泰姆	SOP-8PP8h嘉泰姆	CMP8h嘉泰姆	1P8h嘉泰姆	4P8h嘉泰姆	4.5P8h嘉泰姆	26P8h嘉泰姆	380P8h嘉泰姆	0.8P8h嘉泰姆	80P8h嘉泰姆		1000P8h嘉泰姆
CXSD62125P8h嘉泰姆	SOT23-5|TSOT23-5P8h嘉泰姆	CMP8h嘉泰姆	1P8h嘉泰姆	1P8h嘉泰姆	2.7P8h嘉泰姆	6P8h嘉泰姆	1500P8h嘉泰姆	0.6P8h嘉泰姆	280P8h嘉泰姆	250P8h嘉泰姆	25P8h嘉泰姆
CXSD62125AP8h嘉泰姆	SOT23-5P8h嘉泰姆	CMP8h嘉泰姆	1P8h嘉泰姆	1P8h嘉泰姆	2.7P8h嘉泰姆	6P8h嘉泰姆	1500P8h嘉泰姆	0.6P8h嘉泰姆	280P8h嘉泰姆	250P8h嘉泰姆
CXSD62126P8h嘉泰姆	SOP-8P8h嘉泰姆	CMP8h嘉泰姆	1P8h嘉泰姆	3P8h嘉泰姆	4.3P8h嘉泰姆	14P8h嘉泰姆	500P8h嘉泰姆	0.8P8h嘉泰姆	70P8h嘉泰姆	70P8h嘉泰姆	500P8h嘉泰姆
CXSD62127P8h嘉泰姆	SOP-8PP8h嘉泰姆	CMP8h嘉泰姆	1P8h嘉泰姆	3P8h嘉泰姆	4.3P8h嘉泰姆	14P8h嘉泰姆	500P8h嘉泰姆	0.8P8h嘉泰姆	55P8h嘉泰姆	45P8h嘉泰姆	500P8h嘉泰姆
CXSD62128BP8h嘉泰姆	TDFN3x3-10P8h嘉泰姆			3P8h嘉泰姆	2.6P8h嘉泰姆	5.5P8h嘉泰姆	2000P8h嘉泰姆	0.8P8h嘉泰姆	110P8h嘉泰姆	110P8h嘉泰姆	460P8h嘉泰姆
CXSD62129P8h嘉泰姆	TDFN3x3-10P8h嘉泰姆	CMP8h嘉泰姆	2P8h嘉泰姆	1P8h嘉泰姆	2.7P8h嘉泰姆	6P8h嘉泰姆	1500P8h嘉泰姆	0.6P8h嘉泰姆	280P8h嘉泰姆	250P8h嘉泰姆	500P8h嘉泰姆
CXSD62129AP8h嘉泰姆	TDFN3x3-10P8h嘉泰姆	CMP8h嘉泰姆	2P8h嘉泰姆	1P8h嘉泰姆	2.7P8h嘉泰姆	6P8h嘉泰姆	1500P8h嘉泰姆	0.6P8h嘉泰姆	280P8h嘉泰姆	250P8h嘉泰姆
CXSD62130P8h嘉泰姆	TDFN2x2-6P8h嘉泰姆	CMP8h嘉泰姆	1P8h嘉泰姆	1P8h嘉泰姆	2.7P8h嘉泰姆	6P8h嘉泰姆	1500P8h嘉泰姆	0.6P8h嘉泰姆	280P8h嘉泰姆	250P8h嘉泰姆	25P8h嘉泰姆
CXSD62130AP8h嘉泰姆	TDFN2x2-6P8h嘉泰姆	CMP8h嘉泰姆	1P8h嘉泰姆	1P8h嘉泰姆	2.7P8h嘉泰姆	6P8h嘉泰姆	1500P8h嘉泰姆	0.6P8h嘉泰姆	280P8h嘉泰姆	250P8h嘉泰姆
CXSD62131P8h嘉泰姆	TDFN3x3-12P8h嘉泰姆	CMP8h嘉泰姆	2P8h嘉泰姆	1P8h嘉泰姆	2.7P8h嘉泰姆	6P8h嘉泰姆	1500P8h嘉泰姆	0.6P8h嘉泰姆	280P8h嘉泰姆	250P8h嘉泰姆	25P8h嘉泰姆
CXSD62131AP8h嘉泰姆	TDFN3x3-12P8h嘉泰姆	CMP8h嘉泰姆	2P8h嘉泰姆	1P8h嘉泰姆	2.7P8h嘉泰姆	6P8h嘉泰姆	1500P8h嘉泰姆	0.6P8h嘉泰姆	280P8h嘉泰姆	250P8h嘉泰姆
CXSD62131CP8h嘉泰姆	TDFN 3x3 12P8h嘉泰姆	CMP8h嘉泰姆	2P8h嘉泰姆	1P8h嘉泰姆	3P8h嘉泰姆	5.5P8h嘉泰姆	1500P8h嘉泰姆	0.6P8h嘉泰姆	280P8h嘉泰姆	250P8h嘉泰姆	30P8h嘉泰姆
CXSD62132P8h嘉泰姆	TQFN3x3-20P8h嘉泰姆	CMP8h嘉泰姆	3P8h嘉泰姆	2P8h嘉泰姆	2.9P8h嘉泰姆	5.5P8h嘉泰姆	1500P8h嘉泰姆	0.6P8h嘉泰姆	-P8h嘉泰姆	-P8h嘉泰姆	300P8h嘉泰姆
CXSD62133P8h嘉泰姆	TDFN2x2-8P8h嘉泰姆	CMP8h嘉泰姆	1P8h嘉泰姆	1P8h嘉泰姆	3.3P8h嘉泰姆	8P8h嘉泰姆	1500P8h嘉泰姆	0.6P8h嘉泰姆	280P8h嘉泰姆	250P8h嘉泰姆	25P8h嘉泰姆
CXSD62134P8h嘉泰姆	SOP-8P8h嘉泰姆	CMP8h嘉泰姆	1P8h嘉泰姆	2P8h嘉泰姆	4.5P8h嘉泰姆	24P8h嘉泰姆	340P8h嘉泰姆	0.925P8h嘉泰姆	110P8h嘉泰姆	110P8h嘉泰姆	1900P8h嘉泰姆
上一篇：CXSD62151欠压锁定软启动过温和限流保护等功能宽输入电压从4.5伏到24伏 2.5A连续输出电流 下一篇：3.2A 5V 1MHz同步降压变换器CXSD62153 85mW高压侧和75mW低压侧功率mosfet电流模式控制可调输出电压 发表评论 共有条评论 用户名: 密码: 验证码: 匿名发表