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

七,功能概述vKK嘉泰姆

VCC and VIN Power-On-Reset (POR)vKK嘉泰姆
TThe CXSD62152/A keeps monitoring the voltage on VIN and VCC pins to prevent wrong logic operations whichvKK嘉泰姆
may occur when VIN or VCC voltage is not high enough for internal control circuitry to operate. The VCC POR ris-vKK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.vKK嘉泰姆
During startup, the VCC and VIN voltage must exceed the POR threshold. Then the IC starts a starts-up processvKK嘉泰姆
and ramps up the output voltage to the voltage target. vKK嘉泰姆
Output Under-Voltage Protection (UVP)vKK嘉泰姆
In the operational process, if a short-circuit occurs, the output voltage will drop quickly. Before the current-limitvKK嘉泰姆
circuit responds, the output voltage will fall out of the required regulation range. The under-voltage continuallyvKK嘉泰姆
monitors the FB voltage after soft-start is completed. If a load step is strong enough to pull the output voltage lowervKK嘉泰姆
than the under-voltage threshold, the IC shuts down converter’s output.The under-voltage threshold is 50% of thevKK嘉泰姆
nominal out put voltage. The under-voltage comparator has a built-in 3μs noise filter to prevent the chips from wrongvKK嘉泰姆
UVP shut down being caused by noise. The CXSD62152/A will be latched after under-voltage protection.vKK嘉泰姆
Over-Voltage Protection (OVP)vKK嘉泰姆
The over-voltage function monitors the output voltage by FB pin. When the FB voltage increases over 125% of thevKK嘉泰姆
reference voltage due to the high-side MOSFET failure or for other reasons, the over-voltage protection comparatorvKK嘉泰姆
will force the low-side MOSFET gate driver high till the occurence of low-side current limit. This action activelyvKK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 offvKK嘉泰姆
and needs a POR or enable to recover to normal operation.vKK嘉泰姆
Over-Temperature Protection (OTP)vKK嘉泰姆
The over-temperature circuit limits the junction tempera ture of the CXSD62152/A. When the junction temperaturevKK嘉泰姆
exceeds TJ = 160oC, a thermal sensor turns off the both power MOSFETs, allowing the devices to cool.vKK嘉泰姆
The thermal sensor allows the converters to start a start up process and to regulate the output voltage again aftervKK嘉泰姆
the junction temperature cools by 50oC. The OTP is designed with a 50oC hysteresis to lower the average TJvKK嘉泰姆
during continuous thermal overload conditions, increasing lifetime of the CXSD62152/A.vKK嘉泰姆
Current-Limit Protection vKK嘉泰姆
The CXSD62152/A monitors the output current, flows through the high-side and low-side power MOSFETs, and limitsvKK嘉泰姆
the current peak at current-limit level to prevent the IC from damaging during overload, short-circuit and over-vKK嘉泰姆
voltage conditions. Typical high side power MOSFET current limit is 3A, and low side MOSFET current limit is 1.9A.vKK嘉泰姆
 Soft-StartvKK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 surgevKK嘉泰姆
during start-up. During soft-start, an internal voltage ramp connected to one of the positive inputs of the errorvKK嘉泰姆
amplifier, rises up from 0V to 0.95V to replace the reference voltage (0.8V) until the voltage ramp reaches thevKK嘉泰姆
reference voltage. During soft-start without output overvoltage, the CXSD62152/A converter¡|s sinking capability isvKK嘉泰姆
disabled until the output voltage reaches the voltage target.vKK嘉泰姆
Soft-StopvKK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 loadvKK嘉泰姆
current also discharges the output voltage. During softstop, the internal voltage ramp (VRAMP) falls down from 0.vKK嘉泰姆
95V to 0V to replace the reference voltage. Therefore, the output voltage falls down slowly at the light load. After thevKK嘉泰姆
soft-stop interval elapses, the soft-stop process ends and the IC turns on the low-side power MOSFET.vKK嘉泰姆
八,相关产品                更多同类产品.......vKK嘉泰姆

Switching Regulator > Buck ConvertervKK嘉泰姆
Part_No vKK嘉泰姆	PackagevKK嘉泰姆	ArchitectuvKK嘉泰姆	No.ofvKK嘉泰姆 PWM vKK嘉泰姆 OutpuvKK嘉泰姆	DrivevKK嘉泰姆 LoutvKK嘉泰姆 (A) vKK嘉泰姆	Vin(V) vKK嘉泰姆		FmaxvKK嘉泰姆 Khz vKK嘉泰姆	Vref vKK嘉泰姆 (V) vKK嘉泰姆	R-Top (milohm) vKK嘉泰姆	R-Sync (milohm) vKK嘉泰姆	Iq (No load) (uA) vKK嘉泰姆
					minvKK嘉泰姆	maxvKK嘉泰姆
CXSD62122vKK嘉泰姆	TQFN5x6-28vKK嘉泰姆	CMvKK嘉泰姆	1vKK嘉泰姆	5vKK嘉泰姆	4.5vKK嘉泰姆	26vKK嘉泰姆	380vKK嘉泰姆	0.8vKK嘉泰姆	50vKK嘉泰姆	20vKK嘉泰姆	1000vKK嘉泰姆
CXSD62123vKK嘉泰姆	SOP-8vKK嘉泰姆	CMvKK嘉泰姆	1vKK嘉泰姆	2vKK嘉泰姆	4.5vKK嘉泰姆	26vKK嘉泰姆	380vKK嘉泰姆	0.8vKK嘉泰姆	100vKK嘉泰姆		1000vKK嘉泰姆
CXSD62124vKK嘉泰姆	SOP-8PvKK嘉泰姆	CMvKK嘉泰姆	1vKK嘉泰姆	4vKK嘉泰姆	4.5vKK嘉泰姆	26vKK嘉泰姆	380vKK嘉泰姆	0.8vKK嘉泰姆	80vKK嘉泰姆		1000vKK嘉泰姆
CXSD62125vKK嘉泰姆	SOT23-5|TSOT23-5vKK嘉泰姆	CMvKK嘉泰姆	1vKK嘉泰姆	1vKK嘉泰姆	2.7vKK嘉泰姆	6vKK嘉泰姆	1500vKK嘉泰姆	0.6vKK嘉泰姆	280vKK嘉泰姆	250vKK嘉泰姆	25vKK嘉泰姆
CXSD62125AvKK嘉泰姆	SOT23-5vKK嘉泰姆	CMvKK嘉泰姆	1vKK嘉泰姆	1vKK嘉泰姆	2.7vKK嘉泰姆	6vKK嘉泰姆	1500vKK嘉泰姆	0.6vKK嘉泰姆	280vKK嘉泰姆	250vKK嘉泰姆
CXSD62126vKK嘉泰姆	SOP-8vKK嘉泰姆	CMvKK嘉泰姆	1vKK嘉泰姆	3vKK嘉泰姆	4.3vKK嘉泰姆	14vKK嘉泰姆	500vKK嘉泰姆	0.8vKK嘉泰姆	70vKK嘉泰姆	70vKK嘉泰姆	500vKK嘉泰姆
CXSD62127vKK嘉泰姆	SOP-8PvKK嘉泰姆	CMvKK嘉泰姆	1vKK嘉泰姆	3vKK嘉泰姆	4.3vKK嘉泰姆	14vKK嘉泰姆	500vKK嘉泰姆	0.8vKK嘉泰姆	55vKK嘉泰姆	45vKK嘉泰姆	500vKK嘉泰姆
CXSD62128BvKK嘉泰姆	TDFN3x3-10vKK嘉泰姆			3vKK嘉泰姆	2.6vKK嘉泰姆	5.5vKK嘉泰姆	2000vKK嘉泰姆	0.8vKK嘉泰姆	110vKK嘉泰姆	110vKK嘉泰姆	460vKK嘉泰姆
CXSD62129vKK嘉泰姆	TDFN3x3-10vKK嘉泰姆	CMvKK嘉泰姆	2vKK嘉泰姆	1vKK嘉泰姆	2.7vKK嘉泰姆	6vKK嘉泰姆	1500vKK嘉泰姆	0.6vKK嘉泰姆	280vKK嘉泰姆	250vKK嘉泰姆	500vKK嘉泰姆
CXSD62129AvKK嘉泰姆	TDFN3x3-10vKK嘉泰姆	CMvKK嘉泰姆	2vKK嘉泰姆	1vKK嘉泰姆	2.7vKK嘉泰姆	6vKK嘉泰姆	1500vKK嘉泰姆	0.6vKK嘉泰姆	280vKK嘉泰姆	250vKK嘉泰姆
CXSD62130vKK嘉泰姆	TDFN2x2-6vKK嘉泰姆	CMvKK嘉泰姆	1vKK嘉泰姆	1vKK嘉泰姆	2.7vKK嘉泰姆	6vKK嘉泰姆	1500vKK嘉泰姆	0.6vKK嘉泰姆	280vKK嘉泰姆	250vKK嘉泰姆	25vKK嘉泰姆
CXSD62130AvKK嘉泰姆	TDFN2x2-6vKK嘉泰姆	CMvKK嘉泰姆	1vKK嘉泰姆	1vKK嘉泰姆	2.7vKK嘉泰姆	6vKK嘉泰姆	1500vKK嘉泰姆	0.6vKK嘉泰姆	280vKK嘉泰姆	250vKK嘉泰姆
CXSD62131vKK嘉泰姆	TDFN3x3-12vKK嘉泰姆	CMvKK嘉泰姆	2vKK嘉泰姆	1vKK嘉泰姆	2.7vKK嘉泰姆	6vKK嘉泰姆	1500vKK嘉泰姆	0.6vKK嘉泰姆	280vKK嘉泰姆	250vKK嘉泰姆	25vKK嘉泰姆
CXSD62131AvKK嘉泰姆	TDFN3x3-12vKK嘉泰姆	CMvKK嘉泰姆	2vKK嘉泰姆	1vKK嘉泰姆	2.7vKK嘉泰姆	6vKK嘉泰姆	1500vKK嘉泰姆	0.6vKK嘉泰姆	280vKK嘉泰姆	250vKK嘉泰姆
CXSD62131CvKK嘉泰姆	TDFN 3x3 12vKK嘉泰姆	CMvKK嘉泰姆	2vKK嘉泰姆	1vKK嘉泰姆	3vKK嘉泰姆	5.5vKK嘉泰姆	1500vKK嘉泰姆	0.6vKK嘉泰姆	280vKK嘉泰姆	250vKK嘉泰姆	30vKK嘉泰姆
CXSD62132vKK嘉泰姆	TQFN3x3-20vKK嘉泰姆	CMvKK嘉泰姆	3vKK嘉泰姆	2vKK嘉泰姆	2.9vKK嘉泰姆	5.5vKK嘉泰姆	1500vKK嘉泰姆	0.6vKK嘉泰姆	-vKK嘉泰姆	-vKK嘉泰姆	300vKK嘉泰姆
CXSD62133vKK嘉泰姆	TDFN2x2-8vKK嘉泰姆	CMvKK嘉泰姆	1vKK嘉泰姆	1vKK嘉泰姆	3.3vKK嘉泰姆	8vKK嘉泰姆	1500vKK嘉泰姆	0.6vKK嘉泰姆	280vKK嘉泰姆	250vKK嘉泰姆	25vKK嘉泰姆
CXSD62134vKK嘉泰姆	SOP-8vKK嘉泰姆	CMvKK嘉泰姆	1vKK嘉泰姆	2vKK嘉泰姆	4.5vKK嘉泰姆	24vKK嘉泰姆	340vKK嘉泰姆	0.925vKK嘉泰姆	110vKK嘉泰姆	110vKK嘉泰姆	1900vKK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