1.产品概述                       2.产品特点tA9嘉泰姆
3.应用范围                       4.下载产品资料PDF文档 tA9嘉泰姆
5.产品封装图                     6.电路原理图                   tA9嘉泰姆
7.功能概述                        8.相关产品tA9嘉泰姆

七,功能概述tA9嘉泰姆

VCC and VIN Power-On-Reset (POR)tA9嘉泰姆
TThe CXSD62152/A keeps monitoring the voltage on VIN and VCC pins to prevent wrong logic operations whichtA9嘉泰姆
may occur when VIN or VCC voltage is not high enough for internal control circuitry to operate. The VCC POR ris-tA9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.tA9嘉泰姆
During startup, the VCC and VIN voltage must exceed the POR threshold. Then the IC starts a starts-up processtA9嘉泰姆
and ramps up the output voltage to the voltage target. tA9嘉泰姆
Output Under-Voltage Protection (UVP)tA9嘉泰姆
In the operational process, if a short-circuit occurs, the output voltage will drop quickly. Before the current-limittA9嘉泰姆
circuit responds, the output voltage will fall out of the required regulation range. The under-voltage continuallytA9嘉泰姆
monitors the FB voltage after soft-start is completed. If a load step is strong enough to pull the output voltage lowertA9嘉泰姆
than the under-voltage threshold, the IC shuts down converter’s output.The under-voltage threshold is 50% of thetA9嘉泰姆
nominal out put voltage. The under-voltage comparator has a built-in 3μs noise filter to prevent the chips from wrongtA9嘉泰姆
UVP shut down being caused by noise. The CXSD62152/A will be latched after under-voltage protection.tA9嘉泰姆
Over-Voltage Protection (OVP)tA9嘉泰姆
The over-voltage function monitors the output voltage by FB pin. When the FB voltage increases over 125% of thetA9嘉泰姆
reference voltage due to the high-side MOSFET failure or for other reasons, the over-voltage protection comparatortA9嘉泰姆
will force the low-side MOSFET gate driver high till the occurence of low-side current limit. This action activelytA9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 offtA9嘉泰姆
and needs a POR or enable to recover to normal operation.tA9嘉泰姆
Over-Temperature Protection (OTP)tA9嘉泰姆
The over-temperature circuit limits the junction tempera ture of the CXSD62152/A. When the junction temperaturetA9嘉泰姆
exceeds TJ = 160oC, a thermal sensor turns off the both power MOSFETs, allowing the devices to cool.tA9嘉泰姆
The thermal sensor allows the converters to start a start up process and to regulate the output voltage again aftertA9嘉泰姆
the junction temperature cools by 50oC. The OTP is designed with a 50oC hysteresis to lower the average TJtA9嘉泰姆
during continuous thermal overload conditions, increasing lifetime of the CXSD62152/A.tA9嘉泰姆
Current-Limit Protection tA9嘉泰姆
The CXSD62152/A monitors the output current, flows through the high-side and low-side power MOSFETs, and limitstA9嘉泰姆
the current peak at current-limit level to prevent the IC from damaging during overload, short-circuit and over-tA9嘉泰姆
voltage conditions. Typical high side power MOSFET current limit is 3A, and low side MOSFET current limit is 1.9A.tA9嘉泰姆
 Soft-StarttA9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 surgetA9嘉泰姆
during start-up. During soft-start, an internal voltage ramp connected to one of the positive inputs of the errortA9嘉泰姆
amplifier, rises up from 0V to 0.95V to replace the reference voltage (0.8V) until the voltage ramp reaches thetA9嘉泰姆
reference voltage. During soft-start without output overvoltage, the CXSD62152/A converter¡|s sinking capability istA9嘉泰姆
disabled until the output voltage reaches the voltage target.tA9嘉泰姆
Soft-StoptA9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 loadtA9嘉泰姆
current also discharges the output voltage. During softstop, the internal voltage ramp (VRAMP) falls down from 0.tA9嘉泰姆
95V to 0V to replace the reference voltage. Therefore, the output voltage falls down slowly at the light load. After thetA9嘉泰姆
soft-stop interval elapses, the soft-stop process ends and the IC turns on the low-side power MOSFET.tA9嘉泰姆
八,相关产品                更多同类产品.......tA9嘉泰姆

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Part_No tA9嘉泰姆	PackagetA9嘉泰姆	ArchitectutA9嘉泰姆	No.oftA9嘉泰姆 PWM tA9嘉泰姆 OutputA9嘉泰姆	DrivetA9嘉泰姆 LouttA9嘉泰姆 (A) tA9嘉泰姆	Vin(V) tA9嘉泰姆		FmaxtA9嘉泰姆 Khz tA9嘉泰姆	Vref tA9嘉泰姆 (V) tA9嘉泰姆	R-Top (milohm) tA9嘉泰姆	R-Sync (milohm) tA9嘉泰姆	Iq (No load) (uA) tA9嘉泰姆
					mintA9嘉泰姆	maxtA9嘉泰姆
CXSD62122tA9嘉泰姆	TQFN5x6-28tA9嘉泰姆	CMtA9嘉泰姆	1tA9嘉泰姆	5tA9嘉泰姆	4.5tA9嘉泰姆	26tA9嘉泰姆	380tA9嘉泰姆	0.8tA9嘉泰姆	50tA9嘉泰姆	20tA9嘉泰姆	1000tA9嘉泰姆
CXSD62123tA9嘉泰姆	SOP-8tA9嘉泰姆	CMtA9嘉泰姆	1tA9嘉泰姆	2tA9嘉泰姆	4.5tA9嘉泰姆	26tA9嘉泰姆	380tA9嘉泰姆	0.8tA9嘉泰姆	100tA9嘉泰姆		1000tA9嘉泰姆
CXSD62124tA9嘉泰姆	SOP-8PtA9嘉泰姆	CMtA9嘉泰姆	1tA9嘉泰姆	4tA9嘉泰姆	4.5tA9嘉泰姆	26tA9嘉泰姆	380tA9嘉泰姆	0.8tA9嘉泰姆	80tA9嘉泰姆		1000tA9嘉泰姆
CXSD62125tA9嘉泰姆	SOT23-5|TSOT23-5tA9嘉泰姆	CMtA9嘉泰姆	1tA9嘉泰姆	1tA9嘉泰姆	2.7tA9嘉泰姆	6tA9嘉泰姆	1500tA9嘉泰姆	0.6tA9嘉泰姆	280tA9嘉泰姆	250tA9嘉泰姆	25tA9嘉泰姆
CXSD62125AtA9嘉泰姆	SOT23-5tA9嘉泰姆	CMtA9嘉泰姆	1tA9嘉泰姆	1tA9嘉泰姆	2.7tA9嘉泰姆	6tA9嘉泰姆	1500tA9嘉泰姆	0.6tA9嘉泰姆	280tA9嘉泰姆	250tA9嘉泰姆
CXSD62126tA9嘉泰姆	SOP-8tA9嘉泰姆	CMtA9嘉泰姆	1tA9嘉泰姆	3tA9嘉泰姆	4.3tA9嘉泰姆	14tA9嘉泰姆	500tA9嘉泰姆	0.8tA9嘉泰姆	70tA9嘉泰姆	70tA9嘉泰姆	500tA9嘉泰姆
CXSD62127tA9嘉泰姆	SOP-8PtA9嘉泰姆	CMtA9嘉泰姆	1tA9嘉泰姆	3tA9嘉泰姆	4.3tA9嘉泰姆	14tA9嘉泰姆	500tA9嘉泰姆	0.8tA9嘉泰姆	55tA9嘉泰姆	45tA9嘉泰姆	500tA9嘉泰姆
CXSD62128BtA9嘉泰姆	TDFN3x3-10tA9嘉泰姆			3tA9嘉泰姆	2.6tA9嘉泰姆	5.5tA9嘉泰姆	2000tA9嘉泰姆	0.8tA9嘉泰姆	110tA9嘉泰姆	110tA9嘉泰姆	460tA9嘉泰姆
CXSD62129tA9嘉泰姆	TDFN3x3-10tA9嘉泰姆	CMtA9嘉泰姆	2tA9嘉泰姆	1tA9嘉泰姆	2.7tA9嘉泰姆	6tA9嘉泰姆	1500tA9嘉泰姆	0.6tA9嘉泰姆	280tA9嘉泰姆	250tA9嘉泰姆	500tA9嘉泰姆
CXSD62129AtA9嘉泰姆	TDFN3x3-10tA9嘉泰姆	CMtA9嘉泰姆	2tA9嘉泰姆	1tA9嘉泰姆	2.7tA9嘉泰姆	6tA9嘉泰姆	1500tA9嘉泰姆	0.6tA9嘉泰姆	280tA9嘉泰姆	250tA9嘉泰姆
CXSD62130tA9嘉泰姆	TDFN2x2-6tA9嘉泰姆	CMtA9嘉泰姆	1tA9嘉泰姆	1tA9嘉泰姆	2.7tA9嘉泰姆	6tA9嘉泰姆	1500tA9嘉泰姆	0.6tA9嘉泰姆	280tA9嘉泰姆	250tA9嘉泰姆	25tA9嘉泰姆
CXSD62130AtA9嘉泰姆	TDFN2x2-6tA9嘉泰姆	CMtA9嘉泰姆	1tA9嘉泰姆	1tA9嘉泰姆	2.7tA9嘉泰姆	6tA9嘉泰姆	1500tA9嘉泰姆	0.6tA9嘉泰姆	280tA9嘉泰姆	250tA9嘉泰姆
CXSD62131tA9嘉泰姆	TDFN3x3-12tA9嘉泰姆	CMtA9嘉泰姆	2tA9嘉泰姆	1tA9嘉泰姆	2.7tA9嘉泰姆	6tA9嘉泰姆	1500tA9嘉泰姆	0.6tA9嘉泰姆	280tA9嘉泰姆	250tA9嘉泰姆	25tA9嘉泰姆
CXSD62131AtA9嘉泰姆	TDFN3x3-12tA9嘉泰姆	CMtA9嘉泰姆	2tA9嘉泰姆	1tA9嘉泰姆	2.7tA9嘉泰姆	6tA9嘉泰姆	1500tA9嘉泰姆	0.6tA9嘉泰姆	280tA9嘉泰姆	250tA9嘉泰姆
CXSD62131CtA9嘉泰姆	TDFN 3x3 12tA9嘉泰姆	CMtA9嘉泰姆	2tA9嘉泰姆	1tA9嘉泰姆	3tA9嘉泰姆	5.5tA9嘉泰姆	1500tA9嘉泰姆	0.6tA9嘉泰姆	280tA9嘉泰姆	250tA9嘉泰姆	30tA9嘉泰姆
CXSD62132tA9嘉泰姆	TQFN3x3-20tA9嘉泰姆	CMtA9嘉泰姆	3tA9嘉泰姆	2tA9嘉泰姆	2.9tA9嘉泰姆	5.5tA9嘉泰姆	1500tA9嘉泰姆	0.6tA9嘉泰姆	-tA9嘉泰姆	-tA9嘉泰姆	300tA9嘉泰姆
CXSD62133tA9嘉泰姆	TDFN2x2-8tA9嘉泰姆	CMtA9嘉泰姆	1tA9嘉泰姆	1tA9嘉泰姆	3.3tA9嘉泰姆	8tA9嘉泰姆	1500tA9嘉泰姆	0.6tA9嘉泰姆	280tA9嘉泰姆	250tA9嘉泰姆	25tA9嘉泰姆
CXSD62134tA9嘉泰姆	SOP-8tA9嘉泰姆	CMtA9嘉泰姆	1tA9嘉泰姆	2tA9嘉泰姆	4.5tA9嘉泰姆	24tA9嘉泰姆	340tA9嘉泰姆	0.925tA9嘉泰姆	110tA9嘉泰姆	110tA9嘉泰姆	1900tA9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