1.产品概述                       2.产品特点g6A嘉泰姆
3.应用范围                       4.下载产品资料PDF文档 g6A嘉泰姆
5.产品封装图                     6.电路原理图                   g6A嘉泰姆
7.功能概述                        8.相关产品g6A嘉泰姆

七,功能概述g6A嘉泰姆

VCC and VIN Power-On-Reset (POR)g6A嘉泰姆
TThe CXSD62152/A keeps monitoring the voltage on VIN and VCC pins to prevent wrong logic operations whichg6A嘉泰姆
may occur when VIN or VCC voltage is not high enough for internal control circuitry to operate. The VCC POR ris-g6A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.g6A嘉泰姆
During startup, the VCC and VIN voltage must exceed the POR threshold. Then the IC starts a starts-up processg6A嘉泰姆
and ramps up the output voltage to the voltage target. g6A嘉泰姆
Output Under-Voltage Protection (UVP)g6A嘉泰姆
In the operational process, if a short-circuit occurs, the output voltage will drop quickly. Before the current-limitg6A嘉泰姆
circuit responds, the output voltage will fall out of the required regulation range. The under-voltage continuallyg6A嘉泰姆
monitors the FB voltage after soft-start is completed. If a load step is strong enough to pull the output voltage lowerg6A嘉泰姆
than the under-voltage threshold, the IC shuts down converter’s output.The under-voltage threshold is 50% of theg6A嘉泰姆
nominal out put voltage. The under-voltage comparator has a built-in 3μs noise filter to prevent the chips from wrongg6A嘉泰姆
UVP shut down being caused by noise. The CXSD62152/A will be latched after under-voltage protection.g6A嘉泰姆
Over-Voltage Protection (OVP)g6A嘉泰姆
The over-voltage function monitors the output voltage by FB pin. When the FB voltage increases over 125% of theg6A嘉泰姆
reference voltage due to the high-side MOSFET failure or for other reasons, the over-voltage protection comparatorg6A嘉泰姆
will force the low-side MOSFET gate driver high till the occurence of low-side current limit. This action activelyg6A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 offg6A嘉泰姆
and needs a POR or enable to recover to normal operation.g6A嘉泰姆
Over-Temperature Protection (OTP)g6A嘉泰姆
The over-temperature circuit limits the junction tempera ture of the CXSD62152/A. When the junction temperatureg6A嘉泰姆
exceeds TJ = 160oC, a thermal sensor turns off the both power MOSFETs, allowing the devices to cool.g6A嘉泰姆
The thermal sensor allows the converters to start a start up process and to regulate the output voltage again afterg6A嘉泰姆
the junction temperature cools by 50oC. The OTP is designed with a 50oC hysteresis to lower the average TJg6A嘉泰姆
during continuous thermal overload conditions, increasing lifetime of the CXSD62152/A.g6A嘉泰姆
Current-Limit Protection g6A嘉泰姆
The CXSD62152/A monitors the output current, flows through the high-side and low-side power MOSFETs, and limitsg6A嘉泰姆
the current peak at current-limit level to prevent the IC from damaging during overload, short-circuit and over-g6A嘉泰姆
voltage conditions. Typical high side power MOSFET current limit is 3A, and low side MOSFET current limit is 1.9A.g6A嘉泰姆
 Soft-Startg6A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 surgeg6A嘉泰姆
during start-up. During soft-start, an internal voltage ramp connected to one of the positive inputs of the errorg6A嘉泰姆
amplifier, rises up from 0V to 0.95V to replace the reference voltage (0.8V) until the voltage ramp reaches theg6A嘉泰姆
reference voltage. During soft-start without output overvoltage, the CXSD62152/A converter¡|s sinking capability isg6A嘉泰姆
disabled until the output voltage reaches the voltage target.g6A嘉泰姆
Soft-Stopg6A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 loadg6A嘉泰姆
current also discharges the output voltage. During softstop, the internal voltage ramp (VRAMP) falls down from 0.g6A嘉泰姆
95V to 0V to replace the reference voltage. Therefore, the output voltage falls down slowly at the light load. After theg6A嘉泰姆
soft-stop interval elapses, the soft-stop process ends and the IC turns on the low-side power MOSFET.g6A嘉泰姆
八,相关产品                更多同类产品.......g6A嘉泰姆

Switching Regulator > Buck Converterg6A嘉泰姆
Part_No g6A嘉泰姆	Packageg6A嘉泰姆	Architectug6A嘉泰姆	No.ofg6A嘉泰姆 PWM g6A嘉泰姆 Outpug6A嘉泰姆	Driveg6A嘉泰姆 Loutg6A嘉泰姆 (A) g6A嘉泰姆	Vin(V) g6A嘉泰姆		Fmaxg6A嘉泰姆 Khz g6A嘉泰姆	Vref g6A嘉泰姆 (V) g6A嘉泰姆	R-Top (milohm) g6A嘉泰姆	R-Sync (milohm) g6A嘉泰姆	Iq (No load) (uA) g6A嘉泰姆
					ming6A嘉泰姆	maxg6A嘉泰姆
CXSD62122g6A嘉泰姆	TQFN5x6-28g6A嘉泰姆	CMg6A嘉泰姆	1g6A嘉泰姆	5g6A嘉泰姆	4.5g6A嘉泰姆	26g6A嘉泰姆	380g6A嘉泰姆	0.8g6A嘉泰姆	50g6A嘉泰姆	20g6A嘉泰姆	1000g6A嘉泰姆
CXSD62123g6A嘉泰姆	SOP-8g6A嘉泰姆	CMg6A嘉泰姆	1g6A嘉泰姆	2g6A嘉泰姆	4.5g6A嘉泰姆	26g6A嘉泰姆	380g6A嘉泰姆	0.8g6A嘉泰姆	100g6A嘉泰姆		1000g6A嘉泰姆
CXSD62124g6A嘉泰姆	SOP-8Pg6A嘉泰姆	CMg6A嘉泰姆	1g6A嘉泰姆	4g6A嘉泰姆	4.5g6A嘉泰姆	26g6A嘉泰姆	380g6A嘉泰姆	0.8g6A嘉泰姆	80g6A嘉泰姆		1000g6A嘉泰姆
CXSD62125g6A嘉泰姆	SOT23-5|TSOT23-5g6A嘉泰姆	CMg6A嘉泰姆	1g6A嘉泰姆	1g6A嘉泰姆	2.7g6A嘉泰姆	6g6A嘉泰姆	1500g6A嘉泰姆	0.6g6A嘉泰姆	280g6A嘉泰姆	250g6A嘉泰姆	25g6A嘉泰姆
CXSD62125Ag6A嘉泰姆	SOT23-5g6A嘉泰姆	CMg6A嘉泰姆	1g6A嘉泰姆	1g6A嘉泰姆	2.7g6A嘉泰姆	6g6A嘉泰姆	1500g6A嘉泰姆	0.6g6A嘉泰姆	280g6A嘉泰姆	250g6A嘉泰姆
CXSD62126g6A嘉泰姆	SOP-8g6A嘉泰姆	CMg6A嘉泰姆	1g6A嘉泰姆	3g6A嘉泰姆	4.3g6A嘉泰姆	14g6A嘉泰姆	500g6A嘉泰姆	0.8g6A嘉泰姆	70g6A嘉泰姆	70g6A嘉泰姆	500g6A嘉泰姆
CXSD62127g6A嘉泰姆	SOP-8Pg6A嘉泰姆	CMg6A嘉泰姆	1g6A嘉泰姆	3g6A嘉泰姆	4.3g6A嘉泰姆	14g6A嘉泰姆	500g6A嘉泰姆	0.8g6A嘉泰姆	55g6A嘉泰姆	45g6A嘉泰姆	500g6A嘉泰姆
CXSD62128Bg6A嘉泰姆	TDFN3x3-10g6A嘉泰姆			3g6A嘉泰姆	2.6g6A嘉泰姆	5.5g6A嘉泰姆	2000g6A嘉泰姆	0.8g6A嘉泰姆	110g6A嘉泰姆	110g6A嘉泰姆	460g6A嘉泰姆
CXSD62129g6A嘉泰姆	TDFN3x3-10g6A嘉泰姆	CMg6A嘉泰姆	2g6A嘉泰姆	1g6A嘉泰姆	2.7g6A嘉泰姆	6g6A嘉泰姆	1500g6A嘉泰姆	0.6g6A嘉泰姆	280g6A嘉泰姆	250g6A嘉泰姆	500g6A嘉泰姆
CXSD62129Ag6A嘉泰姆	TDFN3x3-10g6A嘉泰姆	CMg6A嘉泰姆	2g6A嘉泰姆	1g6A嘉泰姆	2.7g6A嘉泰姆	6g6A嘉泰姆	1500g6A嘉泰姆	0.6g6A嘉泰姆	280g6A嘉泰姆	250g6A嘉泰姆
CXSD62130g6A嘉泰姆	TDFN2x2-6g6A嘉泰姆	CMg6A嘉泰姆	1g6A嘉泰姆	1g6A嘉泰姆	2.7g6A嘉泰姆	6g6A嘉泰姆	1500g6A嘉泰姆	0.6g6A嘉泰姆	280g6A嘉泰姆	250g6A嘉泰姆	25g6A嘉泰姆
CXSD62130Ag6A嘉泰姆	TDFN2x2-6g6A嘉泰姆	CMg6A嘉泰姆	1g6A嘉泰姆	1g6A嘉泰姆	2.7g6A嘉泰姆	6g6A嘉泰姆	1500g6A嘉泰姆	0.6g6A嘉泰姆	280g6A嘉泰姆	250g6A嘉泰姆
CXSD62131g6A嘉泰姆	TDFN3x3-12g6A嘉泰姆	CMg6A嘉泰姆	2g6A嘉泰姆	1g6A嘉泰姆	2.7g6A嘉泰姆	6g6A嘉泰姆	1500g6A嘉泰姆	0.6g6A嘉泰姆	280g6A嘉泰姆	250g6A嘉泰姆	25g6A嘉泰姆
CXSD62131Ag6A嘉泰姆	TDFN3x3-12g6A嘉泰姆	CMg6A嘉泰姆	2g6A嘉泰姆	1g6A嘉泰姆	2.7g6A嘉泰姆	6g6A嘉泰姆	1500g6A嘉泰姆	0.6g6A嘉泰姆	280g6A嘉泰姆	250g6A嘉泰姆
CXSD62131Cg6A嘉泰姆	TDFN 3x3 12g6A嘉泰姆	CMg6A嘉泰姆	2g6A嘉泰姆	1g6A嘉泰姆	3g6A嘉泰姆	5.5g6A嘉泰姆	1500g6A嘉泰姆	0.6g6A嘉泰姆	280g6A嘉泰姆	250g6A嘉泰姆	30g6A嘉泰姆
CXSD62132g6A嘉泰姆	TQFN3x3-20g6A嘉泰姆	CMg6A嘉泰姆	3g6A嘉泰姆	2g6A嘉泰姆	2.9g6A嘉泰姆	5.5g6A嘉泰姆	1500g6A嘉泰姆	0.6g6A嘉泰姆	-g6A嘉泰姆	-g6A嘉泰姆	300g6A嘉泰姆
CXSD62133g6A嘉泰姆	TDFN2x2-8g6A嘉泰姆	CMg6A嘉泰姆	1g6A嘉泰姆	1g6A嘉泰姆	3.3g6A嘉泰姆	8g6A嘉泰姆	1500g6A嘉泰姆	0.6g6A嘉泰姆	280g6A嘉泰姆	250g6A嘉泰姆	25g6A嘉泰姆
CXSD62134g6A嘉泰姆	SOP-8g6A嘉泰姆	CMg6A嘉泰姆	1g6A嘉泰姆	2g6A嘉泰姆	4.5g6A嘉泰姆	24g6A嘉泰姆	340g6A嘉泰姆	0.925g6A嘉泰姆	110g6A嘉泰姆	110g6A嘉泰姆	1900g6A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