1.产品概述                       2.产品特点nl2嘉泰姆
3.应用范围                       4.下载产品资料PDF文档 nl2嘉泰姆
5.产品封装图                     6.电路原理图                   nl2嘉泰姆
7.功能概述                        8.相关产品nl2嘉泰姆

七,功能概述nl2嘉泰姆

VCC and VIN Power-On-Reset (POR)nl2嘉泰姆
TThe CXSD62152/A keeps monitoring the voltage on VIN and VCC pins to prevent wrong logic operations whichnl2嘉泰姆
may occur when VIN or VCC voltage is not high enough for internal control circuitry to operate. The VCC POR ris-nl2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.nl2嘉泰姆
During startup, the VCC and VIN voltage must exceed the POR threshold. Then the IC starts a starts-up processnl2嘉泰姆
and ramps up the output voltage to the voltage target. nl2嘉泰姆
Output Under-Voltage Protection (UVP)nl2嘉泰姆
In the operational process, if a short-circuit occurs, the output voltage will drop quickly. Before the current-limitnl2嘉泰姆
circuit responds, the output voltage will fall out of the required regulation range. The under-voltage continuallynl2嘉泰姆
monitors the FB voltage after soft-start is completed. If a load step is strong enough to pull the output voltage lowernl2嘉泰姆
than the under-voltage threshold, the IC shuts down converter’s output.The under-voltage threshold is 50% of thenl2嘉泰姆
nominal out put voltage. The under-voltage comparator has a built-in 3μs noise filter to prevent the chips from wrongnl2嘉泰姆
UVP shut down being caused by noise. The CXSD62152/A will be latched after under-voltage protection.nl2嘉泰姆
Over-Voltage Protection (OVP)nl2嘉泰姆
The over-voltage function monitors the output voltage by FB pin. When the FB voltage increases over 125% of thenl2嘉泰姆
reference voltage due to the high-side MOSFET failure or for other reasons, the over-voltage protection comparatornl2嘉泰姆
will force the low-side MOSFET gate driver high till the occurence of low-side current limit. This action activelynl2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 offnl2嘉泰姆
and needs a POR or enable to recover to normal operation.nl2嘉泰姆
Over-Temperature Protection (OTP)nl2嘉泰姆
The over-temperature circuit limits the junction tempera ture of the CXSD62152/A. When the junction temperaturenl2嘉泰姆
exceeds TJ = 160oC, a thermal sensor turns off the both power MOSFETs, allowing the devices to cool.nl2嘉泰姆
The thermal sensor allows the converters to start a start up process and to regulate the output voltage again afternl2嘉泰姆
the junction temperature cools by 50oC. The OTP is designed with a 50oC hysteresis to lower the average TJnl2嘉泰姆
during continuous thermal overload conditions, increasing lifetime of the CXSD62152/A.nl2嘉泰姆
Current-Limit Protection nl2嘉泰姆
The CXSD62152/A monitors the output current, flows through the high-side and low-side power MOSFETs, and limitsnl2嘉泰姆
the current peak at current-limit level to prevent the IC from damaging during overload, short-circuit and over-nl2嘉泰姆
voltage conditions. Typical high side power MOSFET current limit is 3A, and low side MOSFET current limit is 1.9A.nl2嘉泰姆
 Soft-Startnl2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 surgenl2嘉泰姆
during start-up. During soft-start, an internal voltage ramp connected to one of the positive inputs of the errornl2嘉泰姆
amplifier, rises up from 0V to 0.95V to replace the reference voltage (0.8V) until the voltage ramp reaches thenl2嘉泰姆
reference voltage. During soft-start without output overvoltage, the CXSD62152/A converter¡|s sinking capability isnl2嘉泰姆
disabled until the output voltage reaches the voltage target.nl2嘉泰姆
Soft-Stopnl2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 loadnl2嘉泰姆
current also discharges the output voltage. During softstop, the internal voltage ramp (VRAMP) falls down from 0.nl2嘉泰姆
95V to 0V to replace the reference voltage. Therefore, the output voltage falls down slowly at the light load. After thenl2嘉泰姆
soft-stop interval elapses, the soft-stop process ends and the IC turns on the low-side power MOSFET.nl2嘉泰姆
八,相关产品                更多同类产品.......nl2嘉泰姆

Switching Regulator > Buck Converternl2嘉泰姆
Part_No nl2嘉泰姆	Packagenl2嘉泰姆	Architectunl2嘉泰姆	No.ofnl2嘉泰姆 PWM nl2嘉泰姆 Outpunl2嘉泰姆	Drivenl2嘉泰姆 Loutnl2嘉泰姆 (A) nl2嘉泰姆	Vin(V) nl2嘉泰姆		Fmaxnl2嘉泰姆 Khz nl2嘉泰姆	Vref nl2嘉泰姆 (V) nl2嘉泰姆	R-Top (milohm) nl2嘉泰姆	R-Sync (milohm) nl2嘉泰姆	Iq (No load) (uA) nl2嘉泰姆
					minnl2嘉泰姆	maxnl2嘉泰姆
CXSD62122nl2嘉泰姆	TQFN5x6-28nl2嘉泰姆	CMnl2嘉泰姆	1nl2嘉泰姆	5nl2嘉泰姆	4.5nl2嘉泰姆	26nl2嘉泰姆	380nl2嘉泰姆	0.8nl2嘉泰姆	50nl2嘉泰姆	20nl2嘉泰姆	1000nl2嘉泰姆
CXSD62123nl2嘉泰姆	SOP-8nl2嘉泰姆	CMnl2嘉泰姆	1nl2嘉泰姆	2nl2嘉泰姆	4.5nl2嘉泰姆	26nl2嘉泰姆	380nl2嘉泰姆	0.8nl2嘉泰姆	100nl2嘉泰姆		1000nl2嘉泰姆
CXSD62124nl2嘉泰姆	SOP-8Pnl2嘉泰姆	CMnl2嘉泰姆	1nl2嘉泰姆	4nl2嘉泰姆	4.5nl2嘉泰姆	26nl2嘉泰姆	380nl2嘉泰姆	0.8nl2嘉泰姆	80nl2嘉泰姆		1000nl2嘉泰姆
CXSD62125nl2嘉泰姆	SOT23-5|TSOT23-5nl2嘉泰姆	CMnl2嘉泰姆	1nl2嘉泰姆	1nl2嘉泰姆	2.7nl2嘉泰姆	6nl2嘉泰姆	1500nl2嘉泰姆	0.6nl2嘉泰姆	280nl2嘉泰姆	250nl2嘉泰姆	25nl2嘉泰姆
CXSD62125Anl2嘉泰姆	SOT23-5nl2嘉泰姆	CMnl2嘉泰姆	1nl2嘉泰姆	1nl2嘉泰姆	2.7nl2嘉泰姆	6nl2嘉泰姆	1500nl2嘉泰姆	0.6nl2嘉泰姆	280nl2嘉泰姆	250nl2嘉泰姆
CXSD62126nl2嘉泰姆	SOP-8nl2嘉泰姆	CMnl2嘉泰姆	1nl2嘉泰姆	3nl2嘉泰姆	4.3nl2嘉泰姆	14nl2嘉泰姆	500nl2嘉泰姆	0.8nl2嘉泰姆	70nl2嘉泰姆	70nl2嘉泰姆	500nl2嘉泰姆
CXSD62127nl2嘉泰姆	SOP-8Pnl2嘉泰姆	CMnl2嘉泰姆	1nl2嘉泰姆	3nl2嘉泰姆	4.3nl2嘉泰姆	14nl2嘉泰姆	500nl2嘉泰姆	0.8nl2嘉泰姆	55nl2嘉泰姆	45nl2嘉泰姆	500nl2嘉泰姆
CXSD62128Bnl2嘉泰姆	TDFN3x3-10nl2嘉泰姆			3nl2嘉泰姆	2.6nl2嘉泰姆	5.5nl2嘉泰姆	2000nl2嘉泰姆	0.8nl2嘉泰姆	110nl2嘉泰姆	110nl2嘉泰姆	460nl2嘉泰姆
CXSD62129nl2嘉泰姆	TDFN3x3-10nl2嘉泰姆	CMnl2嘉泰姆	2nl2嘉泰姆	1nl2嘉泰姆	2.7nl2嘉泰姆	6nl2嘉泰姆	1500nl2嘉泰姆	0.6nl2嘉泰姆	280nl2嘉泰姆	250nl2嘉泰姆	500nl2嘉泰姆
CXSD62129Anl2嘉泰姆	TDFN3x3-10nl2嘉泰姆	CMnl2嘉泰姆	2nl2嘉泰姆	1nl2嘉泰姆	2.7nl2嘉泰姆	6nl2嘉泰姆	1500nl2嘉泰姆	0.6nl2嘉泰姆	280nl2嘉泰姆	250nl2嘉泰姆
CXSD62130nl2嘉泰姆	TDFN2x2-6nl2嘉泰姆	CMnl2嘉泰姆	1nl2嘉泰姆	1nl2嘉泰姆	2.7nl2嘉泰姆	6nl2嘉泰姆	1500nl2嘉泰姆	0.6nl2嘉泰姆	280nl2嘉泰姆	250nl2嘉泰姆	25nl2嘉泰姆
CXSD62130Anl2嘉泰姆	TDFN2x2-6nl2嘉泰姆	CMnl2嘉泰姆	1nl2嘉泰姆	1nl2嘉泰姆	2.7nl2嘉泰姆	6nl2嘉泰姆	1500nl2嘉泰姆	0.6nl2嘉泰姆	280nl2嘉泰姆	250nl2嘉泰姆
CXSD62131nl2嘉泰姆	TDFN3x3-12nl2嘉泰姆	CMnl2嘉泰姆	2nl2嘉泰姆	1nl2嘉泰姆	2.7nl2嘉泰姆	6nl2嘉泰姆	1500nl2嘉泰姆	0.6nl2嘉泰姆	280nl2嘉泰姆	250nl2嘉泰姆	25nl2嘉泰姆
CXSD62131Anl2嘉泰姆	TDFN3x3-12nl2嘉泰姆	CMnl2嘉泰姆	2nl2嘉泰姆	1nl2嘉泰姆	2.7nl2嘉泰姆	6nl2嘉泰姆	1500nl2嘉泰姆	0.6nl2嘉泰姆	280nl2嘉泰姆	250nl2嘉泰姆
CXSD62131Cnl2嘉泰姆	TDFN 3x3 12nl2嘉泰姆	CMnl2嘉泰姆	2nl2嘉泰姆	1nl2嘉泰姆	3nl2嘉泰姆	5.5nl2嘉泰姆	1500nl2嘉泰姆	0.6nl2嘉泰姆	280nl2嘉泰姆	250nl2嘉泰姆	30nl2嘉泰姆
CXSD62132nl2嘉泰姆	TQFN3x3-20nl2嘉泰姆	CMnl2嘉泰姆	3nl2嘉泰姆	2nl2嘉泰姆	2.9nl2嘉泰姆	5.5nl2嘉泰姆	1500nl2嘉泰姆	0.6nl2嘉泰姆	-nl2嘉泰姆	-nl2嘉泰姆	300nl2嘉泰姆
CXSD62133nl2嘉泰姆	TDFN2x2-8nl2嘉泰姆	CMnl2嘉泰姆	1nl2嘉泰姆	1nl2嘉泰姆	3.3nl2嘉泰姆	8nl2嘉泰姆	1500nl2嘉泰姆	0.6nl2嘉泰姆	280nl2嘉泰姆	250nl2嘉泰姆	25nl2嘉泰姆
CXSD62134nl2嘉泰姆	SOP-8nl2嘉泰姆	CMnl2嘉泰姆	1nl2嘉泰姆	2nl2嘉泰姆	4.5nl2嘉泰姆	24nl2嘉泰姆	340nl2嘉泰姆	0.925nl2嘉泰姆	110nl2嘉泰姆	110nl2嘉泰姆	1900nl2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