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

七,功能概述oYL嘉泰姆

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

Switching Regulator > Buck ConverteroYL嘉泰姆
Part_No oYL嘉泰姆	PackageoYL嘉泰姆	ArchitectuoYL嘉泰姆	No.ofoYL嘉泰姆 PWM oYL嘉泰姆 OutpuoYL嘉泰姆	DriveoYL嘉泰姆 LoutoYL嘉泰姆 (A) oYL嘉泰姆	Vin(V) oYL嘉泰姆		FmaxoYL嘉泰姆 Khz oYL嘉泰姆	Vref oYL嘉泰姆 (V) oYL嘉泰姆	R-Top (milohm) oYL嘉泰姆	R-Sync (milohm) oYL嘉泰姆	Iq (No load) (uA) oYL嘉泰姆
					minoYL嘉泰姆	maxoYL嘉泰姆
CXSD62122oYL嘉泰姆	TQFN5x6-28oYL嘉泰姆	CMoYL嘉泰姆	1oYL嘉泰姆	5oYL嘉泰姆	4.5oYL嘉泰姆	26oYL嘉泰姆	380oYL嘉泰姆	0.8oYL嘉泰姆	50oYL嘉泰姆	20oYL嘉泰姆	1000oYL嘉泰姆
CXSD62123oYL嘉泰姆	SOP-8oYL嘉泰姆	CMoYL嘉泰姆	1oYL嘉泰姆	2oYL嘉泰姆	4.5oYL嘉泰姆	26oYL嘉泰姆	380oYL嘉泰姆	0.8oYL嘉泰姆	100oYL嘉泰姆		1000oYL嘉泰姆
CXSD62124oYL嘉泰姆	SOP-8PoYL嘉泰姆	CMoYL嘉泰姆	1oYL嘉泰姆	4oYL嘉泰姆	4.5oYL嘉泰姆	26oYL嘉泰姆	380oYL嘉泰姆	0.8oYL嘉泰姆	80oYL嘉泰姆		1000oYL嘉泰姆
CXSD62125oYL嘉泰姆	SOT23-5|TSOT23-5oYL嘉泰姆	CMoYL嘉泰姆	1oYL嘉泰姆	1oYL嘉泰姆	2.7oYL嘉泰姆	6oYL嘉泰姆	1500oYL嘉泰姆	0.6oYL嘉泰姆	280oYL嘉泰姆	250oYL嘉泰姆	25oYL嘉泰姆
CXSD62125AoYL嘉泰姆	SOT23-5oYL嘉泰姆	CMoYL嘉泰姆	1oYL嘉泰姆	1oYL嘉泰姆	2.7oYL嘉泰姆	6oYL嘉泰姆	1500oYL嘉泰姆	0.6oYL嘉泰姆	280oYL嘉泰姆	250oYL嘉泰姆
CXSD62126oYL嘉泰姆	SOP-8oYL嘉泰姆	CMoYL嘉泰姆	1oYL嘉泰姆	3oYL嘉泰姆	4.3oYL嘉泰姆	14oYL嘉泰姆	500oYL嘉泰姆	0.8oYL嘉泰姆	70oYL嘉泰姆	70oYL嘉泰姆	500oYL嘉泰姆
CXSD62127oYL嘉泰姆	SOP-8PoYL嘉泰姆	CMoYL嘉泰姆	1oYL嘉泰姆	3oYL嘉泰姆	4.3oYL嘉泰姆	14oYL嘉泰姆	500oYL嘉泰姆	0.8oYL嘉泰姆	55oYL嘉泰姆	45oYL嘉泰姆	500oYL嘉泰姆
CXSD62128BoYL嘉泰姆	TDFN3x3-10oYL嘉泰姆			3oYL嘉泰姆	2.6oYL嘉泰姆	5.5oYL嘉泰姆	2000oYL嘉泰姆	0.8oYL嘉泰姆	110oYL嘉泰姆	110oYL嘉泰姆	460oYL嘉泰姆
CXSD62129oYL嘉泰姆	TDFN3x3-10oYL嘉泰姆	CMoYL嘉泰姆	2oYL嘉泰姆	1oYL嘉泰姆	2.7oYL嘉泰姆	6oYL嘉泰姆	1500oYL嘉泰姆	0.6oYL嘉泰姆	280oYL嘉泰姆	250oYL嘉泰姆	500oYL嘉泰姆
CXSD62129AoYL嘉泰姆	TDFN3x3-10oYL嘉泰姆	CMoYL嘉泰姆	2oYL嘉泰姆	1oYL嘉泰姆	2.7oYL嘉泰姆	6oYL嘉泰姆	1500oYL嘉泰姆	0.6oYL嘉泰姆	280oYL嘉泰姆	250oYL嘉泰姆
CXSD62130oYL嘉泰姆	TDFN2x2-6oYL嘉泰姆	CMoYL嘉泰姆	1oYL嘉泰姆	1oYL嘉泰姆	2.7oYL嘉泰姆	6oYL嘉泰姆	1500oYL嘉泰姆	0.6oYL嘉泰姆	280oYL嘉泰姆	250oYL嘉泰姆	25oYL嘉泰姆
CXSD62130AoYL嘉泰姆	TDFN2x2-6oYL嘉泰姆	CMoYL嘉泰姆	1oYL嘉泰姆	1oYL嘉泰姆	2.7oYL嘉泰姆	6oYL嘉泰姆	1500oYL嘉泰姆	0.6oYL嘉泰姆	280oYL嘉泰姆	250oYL嘉泰姆
CXSD62131oYL嘉泰姆	TDFN3x3-12oYL嘉泰姆	CMoYL嘉泰姆	2oYL嘉泰姆	1oYL嘉泰姆	2.7oYL嘉泰姆	6oYL嘉泰姆	1500oYL嘉泰姆	0.6oYL嘉泰姆	280oYL嘉泰姆	250oYL嘉泰姆	25oYL嘉泰姆
CXSD62131AoYL嘉泰姆	TDFN3x3-12oYL嘉泰姆	CMoYL嘉泰姆	2oYL嘉泰姆	1oYL嘉泰姆	2.7oYL嘉泰姆	6oYL嘉泰姆	1500oYL嘉泰姆	0.6oYL嘉泰姆	280oYL嘉泰姆	250oYL嘉泰姆
CXSD62131CoYL嘉泰姆	TDFN 3x3 12oYL嘉泰姆	CMoYL嘉泰姆	2oYL嘉泰姆	1oYL嘉泰姆	3oYL嘉泰姆	5.5oYL嘉泰姆	1500oYL嘉泰姆	0.6oYL嘉泰姆	280oYL嘉泰姆	250oYL嘉泰姆	30oYL嘉泰姆
CXSD62132oYL嘉泰姆	TQFN3x3-20oYL嘉泰姆	CMoYL嘉泰姆	3oYL嘉泰姆	2oYL嘉泰姆	2.9oYL嘉泰姆	5.5oYL嘉泰姆	1500oYL嘉泰姆	0.6oYL嘉泰姆	-oYL嘉泰姆	-oYL嘉泰姆	300oYL嘉泰姆
CXSD62133oYL嘉泰姆	TDFN2x2-8oYL嘉泰姆	CMoYL嘉泰姆	1oYL嘉泰姆	1oYL嘉泰姆	3.3oYL嘉泰姆	8oYL嘉泰姆	1500oYL嘉泰姆	0.6oYL嘉泰姆	280oYL嘉泰姆	250oYL嘉泰姆	25oYL嘉泰姆
CXSD62134oYL嘉泰姆	SOP-8oYL嘉泰姆	CMoYL嘉泰姆	1oYL嘉泰姆	2oYL嘉泰姆	4.5oYL嘉泰姆	24oYL嘉泰姆	340oYL嘉泰姆	0.925oYL嘉泰姆	110oYL嘉泰姆	110oYL嘉泰姆	1900oYL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