1.产品概述                       2.产品特点e8E嘉泰姆
3.应用范围                       4.下载产品资料PDF文档 e8E嘉泰姆
5.产品封装图                     6.电路原理图                   e8E嘉泰姆
7.功能概述                        8.相关产品e8E嘉泰姆

七,功能概述e8E嘉泰姆

VCC and VIN Power-On-Reset (POR)e8E嘉泰姆
TThe CXSD62152/A keeps monitoring the voltage on VIN and VCC pins to prevent wrong logic operations whiche8E嘉泰姆
may occur when VIN or VCC voltage is not high enough for internal control circuitry to operate. The VCC POR ris-e8E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.e8E嘉泰姆
During startup, the VCC and VIN voltage must exceed the POR threshold. Then the IC starts a starts-up processe8E嘉泰姆
and ramps up the output voltage to the voltage target. e8E嘉泰姆
Output Under-Voltage Protection (UVP)e8E嘉泰姆
In the operational process, if a short-circuit occurs, the output voltage will drop quickly. Before the current-limite8E嘉泰姆
circuit responds, the output voltage will fall out of the required regulation range. The under-voltage continuallye8E嘉泰姆
monitors the FB voltage after soft-start is completed. If a load step is strong enough to pull the output voltage lowere8E嘉泰姆
than the under-voltage threshold, the IC shuts down converter’s output.The under-voltage threshold is 50% of thee8E嘉泰姆
nominal out put voltage. The under-voltage comparator has a built-in 3μs noise filter to prevent the chips from wronge8E嘉泰姆
UVP shut down being caused by noise. The CXSD62152/A will be latched after under-voltage protection.e8E嘉泰姆
Over-Voltage Protection (OVP)e8E嘉泰姆
The over-voltage function monitors the output voltage by FB pin. When the FB voltage increases over 125% of thee8E嘉泰姆
reference voltage due to the high-side MOSFET failure or for other reasons, the over-voltage protection comparatore8E嘉泰姆
will force the low-side MOSFET gate driver high till the occurence of low-side current limit. This action activelye8E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 offe8E嘉泰姆
and needs a POR or enable to recover to normal operation.e8E嘉泰姆
Over-Temperature Protection (OTP)e8E嘉泰姆
The over-temperature circuit limits the junction tempera ture of the CXSD62152/A. When the junction temperaturee8E嘉泰姆
exceeds TJ = 160oC, a thermal sensor turns off the both power MOSFETs, allowing the devices to cool.e8E嘉泰姆
The thermal sensor allows the converters to start a start up process and to regulate the output voltage again aftere8E嘉泰姆
the junction temperature cools by 50oC. The OTP is designed with a 50oC hysteresis to lower the average TJe8E嘉泰姆
during continuous thermal overload conditions, increasing lifetime of the CXSD62152/A.e8E嘉泰姆
Current-Limit Protection e8E嘉泰姆
The CXSD62152/A monitors the output current, flows through the high-side and low-side power MOSFETs, and limitse8E嘉泰姆
the current peak at current-limit level to prevent the IC from damaging during overload, short-circuit and over-e8E嘉泰姆
voltage conditions. Typical high side power MOSFET current limit is 3A, and low side MOSFET current limit is 1.9A.e8E嘉泰姆
 Soft-Starte8E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 surgee8E嘉泰姆
during start-up. During soft-start, an internal voltage ramp connected to one of the positive inputs of the errore8E嘉泰姆
amplifier, rises up from 0V to 0.95V to replace the reference voltage (0.8V) until the voltage ramp reaches thee8E嘉泰姆
reference voltage. During soft-start without output overvoltage, the CXSD62152/A converter¡|s sinking capability ise8E嘉泰姆
disabled until the output voltage reaches the voltage target.e8E嘉泰姆
Soft-Stope8E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 loade8E嘉泰姆
current also discharges the output voltage. During softstop, the internal voltage ramp (VRAMP) falls down from 0.e8E嘉泰姆
95V to 0V to replace the reference voltage. Therefore, the output voltage falls down slowly at the light load. After thee8E嘉泰姆
soft-stop interval elapses, the soft-stop process ends and the IC turns on the low-side power MOSFET.e8E嘉泰姆
八,相关产品                更多同类产品.......e8E嘉泰姆

Switching Regulator > Buck Convertere8E嘉泰姆
Part_No e8E嘉泰姆	Packagee8E嘉泰姆	Architectue8E嘉泰姆	No.ofe8E嘉泰姆 PWM e8E嘉泰姆 Outpue8E嘉泰姆	Drivee8E嘉泰姆 Loute8E嘉泰姆 (A) e8E嘉泰姆	Vin(V) e8E嘉泰姆		Fmaxe8E嘉泰姆 Khz e8E嘉泰姆	Vref e8E嘉泰姆 (V) e8E嘉泰姆	R-Top (milohm) e8E嘉泰姆	R-Sync (milohm) e8E嘉泰姆	Iq (No load) (uA) e8E嘉泰姆
					mine8E嘉泰姆	maxe8E嘉泰姆
CXSD62122e8E嘉泰姆	TQFN5x6-28e8E嘉泰姆	CMe8E嘉泰姆	1e8E嘉泰姆	5e8E嘉泰姆	4.5e8E嘉泰姆	26e8E嘉泰姆	380e8E嘉泰姆	0.8e8E嘉泰姆	50e8E嘉泰姆	20e8E嘉泰姆	1000e8E嘉泰姆
CXSD62123e8E嘉泰姆	SOP-8e8E嘉泰姆	CMe8E嘉泰姆	1e8E嘉泰姆	2e8E嘉泰姆	4.5e8E嘉泰姆	26e8E嘉泰姆	380e8E嘉泰姆	0.8e8E嘉泰姆	100e8E嘉泰姆		1000e8E嘉泰姆
CXSD62124e8E嘉泰姆	SOP-8Pe8E嘉泰姆	CMe8E嘉泰姆	1e8E嘉泰姆	4e8E嘉泰姆	4.5e8E嘉泰姆	26e8E嘉泰姆	380e8E嘉泰姆	0.8e8E嘉泰姆	80e8E嘉泰姆		1000e8E嘉泰姆
CXSD62125e8E嘉泰姆	SOT23-5|TSOT23-5e8E嘉泰姆	CMe8E嘉泰姆	1e8E嘉泰姆	1e8E嘉泰姆	2.7e8E嘉泰姆	6e8E嘉泰姆	1500e8E嘉泰姆	0.6e8E嘉泰姆	280e8E嘉泰姆	250e8E嘉泰姆	25e8E嘉泰姆
CXSD62125Ae8E嘉泰姆	SOT23-5e8E嘉泰姆	CMe8E嘉泰姆	1e8E嘉泰姆	1e8E嘉泰姆	2.7e8E嘉泰姆	6e8E嘉泰姆	1500e8E嘉泰姆	0.6e8E嘉泰姆	280e8E嘉泰姆	250e8E嘉泰姆
CXSD62126e8E嘉泰姆	SOP-8e8E嘉泰姆	CMe8E嘉泰姆	1e8E嘉泰姆	3e8E嘉泰姆	4.3e8E嘉泰姆	14e8E嘉泰姆	500e8E嘉泰姆	0.8e8E嘉泰姆	70e8E嘉泰姆	70e8E嘉泰姆	500e8E嘉泰姆
CXSD62127e8E嘉泰姆	SOP-8Pe8E嘉泰姆	CMe8E嘉泰姆	1e8E嘉泰姆	3e8E嘉泰姆	4.3e8E嘉泰姆	14e8E嘉泰姆	500e8E嘉泰姆	0.8e8E嘉泰姆	55e8E嘉泰姆	45e8E嘉泰姆	500e8E嘉泰姆
CXSD62128Be8E嘉泰姆	TDFN3x3-10e8E嘉泰姆			3e8E嘉泰姆	2.6e8E嘉泰姆	5.5e8E嘉泰姆	2000e8E嘉泰姆	0.8e8E嘉泰姆	110e8E嘉泰姆	110e8E嘉泰姆	460e8E嘉泰姆
CXSD62129e8E嘉泰姆	TDFN3x3-10e8E嘉泰姆	CMe8E嘉泰姆	2e8E嘉泰姆	1e8E嘉泰姆	2.7e8E嘉泰姆	6e8E嘉泰姆	1500e8E嘉泰姆	0.6e8E嘉泰姆	280e8E嘉泰姆	250e8E嘉泰姆	500e8E嘉泰姆
CXSD62129Ae8E嘉泰姆	TDFN3x3-10e8E嘉泰姆	CMe8E嘉泰姆	2e8E嘉泰姆	1e8E嘉泰姆	2.7e8E嘉泰姆	6e8E嘉泰姆	1500e8E嘉泰姆	0.6e8E嘉泰姆	280e8E嘉泰姆	250e8E嘉泰姆
CXSD62130e8E嘉泰姆	TDFN2x2-6e8E嘉泰姆	CMe8E嘉泰姆	1e8E嘉泰姆	1e8E嘉泰姆	2.7e8E嘉泰姆	6e8E嘉泰姆	1500e8E嘉泰姆	0.6e8E嘉泰姆	280e8E嘉泰姆	250e8E嘉泰姆	25e8E嘉泰姆
CXSD62130Ae8E嘉泰姆	TDFN2x2-6e8E嘉泰姆	CMe8E嘉泰姆	1e8E嘉泰姆	1e8E嘉泰姆	2.7e8E嘉泰姆	6e8E嘉泰姆	1500e8E嘉泰姆	0.6e8E嘉泰姆	280e8E嘉泰姆	250e8E嘉泰姆
CXSD62131e8E嘉泰姆	TDFN3x3-12e8E嘉泰姆	CMe8E嘉泰姆	2e8E嘉泰姆	1e8E嘉泰姆	2.7e8E嘉泰姆	6e8E嘉泰姆	1500e8E嘉泰姆	0.6e8E嘉泰姆	280e8E嘉泰姆	250e8E嘉泰姆	25e8E嘉泰姆
CXSD62131Ae8E嘉泰姆	TDFN3x3-12e8E嘉泰姆	CMe8E嘉泰姆	2e8E嘉泰姆	1e8E嘉泰姆	2.7e8E嘉泰姆	6e8E嘉泰姆	1500e8E嘉泰姆	0.6e8E嘉泰姆	280e8E嘉泰姆	250e8E嘉泰姆
CXSD62131Ce8E嘉泰姆	TDFN 3x3 12e8E嘉泰姆	CMe8E嘉泰姆	2e8E嘉泰姆	1e8E嘉泰姆	3e8E嘉泰姆	5.5e8E嘉泰姆	1500e8E嘉泰姆	0.6e8E嘉泰姆	280e8E嘉泰姆	250e8E嘉泰姆	30e8E嘉泰姆
CXSD62132e8E嘉泰姆	TQFN3x3-20e8E嘉泰姆	CMe8E嘉泰姆	3e8E嘉泰姆	2e8E嘉泰姆	2.9e8E嘉泰姆	5.5e8E嘉泰姆	1500e8E嘉泰姆	0.6e8E嘉泰姆	-e8E嘉泰姆	-e8E嘉泰姆	300e8E嘉泰姆
CXSD62133e8E嘉泰姆	TDFN2x2-8e8E嘉泰姆	CMe8E嘉泰姆	1e8E嘉泰姆	1e8E嘉泰姆	3.3e8E嘉泰姆	8e8E嘉泰姆	1500e8E嘉泰姆	0.6e8E嘉泰姆	280e8E嘉泰姆	250e8E嘉泰姆	25e8E嘉泰姆
CXSD62134e8E嘉泰姆	SOP-8e8E嘉泰姆	CMe8E嘉泰姆	1e8E嘉泰姆	2e8E嘉泰姆	4.5e8E嘉泰姆	24e8E嘉泰姆	340e8E嘉泰姆	0.925e8E嘉泰姆	110e8E嘉泰姆	110e8E嘉泰姆	1900e8E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