固定300kHz开关率频CXSD6273同步buck-PWM线性控制器0.8V参考输出电压以及监控和保护功能于一体。固定300kHz开关

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发表时间：2020-04-21浏览次数：173

固定300kHz开关率频CXSD6273同步buck-PWM线性控制器0.8V参考输出电压以及监控和保护功能于一体。固定300kHz开关

目录kRn嘉泰姆

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

一,产品概述(General Description) kRn嘉泰姆

The CXSD6273 integrates synchronous buck PWM, linear controller, and 0.8V ReferencekRn嘉泰姆
Out Voltage, as well as the monitoring and protection functions into a single package. The kRn嘉泰姆
fixed 300kHz switching frequency synchro-nous PWM controller drives dual N-channelkRn嘉泰姆
MOSFETs,which provides one controlled power output with over-voltage and over-currentkRn嘉泰姆
protections. Linear controller drives an external N-channel MOSFET with under-volt-kRn嘉泰姆
age protection.kRn嘉泰姆
The CXSD6273 provides excellent regulation for output load variation. An internal 0.8VkRn嘉泰姆
temperature-compensated ref-erence voltage is designed to meet the requirement ofkRn嘉泰姆
low output voltage applications.kRn嘉泰姆
The CXSD6273 with excellent protection functions: POR,OCP, OVP and UVP. ThekRn嘉泰姆
Power-On-Reset (POR) circuit can monitor VCC12 supply voltage exceeds its thresholdkRn嘉泰姆
voltage while the controller is running, and a built-in digi-tal soft-start provides both outputskRn嘉泰姆
with controlled rising voltage. The Over-Current Protection (OCP) monitors the output currentkRn嘉泰姆
by using the voltage drop across the lower MOSFET’s RDS(ON), comparing with the voltagekRn嘉泰姆
of OCSET pin, VOCSET. The maximum VOCSET voltage is limited to the internal default valuekRn嘉泰姆
0.25V. In addition, when OCSET pin is floating (no ROCSET resistor), the over current thresholdkRn嘉泰姆
will also be internal default value, 0.25V. When the output current reaches the trip point, thekRn嘉泰姆
controller will shutdown the IC directly, and latch the converter’s output. The Un-der-Voltage Protection (UVP) monitors the voltage of FBL pin for short-circuit protection. When the VFBL is less thankRn嘉泰姆
50% of VREF, the controller will shutdown the IC directly.The Over-Voltage Protection (OVP)kRn嘉泰姆
monitors the voltage of FB. When the VFB is over 135% of VREF, the controller willkRn嘉泰姆
make Low-side gate signal fully turn on until the fault events are removed.kRn嘉泰姆
二.产品特点(Features)kRn嘉泰姆

1.)Two Regulated Voltages and REF_OUT Synchronous Buck ConverterkRn嘉泰姆
Linear RegulatorkRn嘉泰姆
REF_OUT = 0.8V±1% with 3mA Source CurrentkRn嘉泰姆
2.)Single 12V Power Supply RequiredkRn嘉泰姆
3.)Excellent Both Output Voltage RegulationkRn嘉泰姆
0.8V Internal ReferencekRn嘉泰姆
±1% Over Line Voltage and TemperaturekRn嘉泰姆
4.)Integrated Soft-Start for PWM and Linear OutputskRn嘉泰姆
5.)300KHz Fixed Switching FrequencykRn嘉泰姆
6.)Voltage Mode PWM Control Design and Up to 89%(Typ.) Duty CyclekRn嘉泰姆
7.)Under-Voltage Protection Monitoring Linear Out-putkRn嘉泰姆
8.)Over-Voltage Protection Monitoring PWM OutputkRn嘉泰姆
9.)Over-Current Protection for PWM Output Sense Low-side MOSFET’s RDS(ON)kRn嘉泰姆

10.)SOP-14, SSOP-16 and Compact QFN4x4-16 pack-ageskRn嘉泰姆
11.)Lead Free and Green Devices Available(RoHS Compliant)kRn嘉泰姆
三,应用范围 (Applications)kRn嘉泰姆

Graphic CardskRn嘉泰姆
四.下载产品资料PDF文档 kRn嘉泰姆

需要详细的PDF规格书请扫一扫微信联系我们，还可以获得免费样品以及技术支持！kRn嘉泰姆

QQ截图20160419174301.jpg kRn嘉泰姆

五,产品封装图 (Package)kRn嘉泰姆
kRn嘉泰姆
FUNCTION NAMEFUNCTIONkRn嘉泰姆

PIN NO.kRn嘉泰姆			NAMEkRn嘉泰姆	FUNCTIONkRn嘉泰姆


SOP-14kRn嘉泰姆	SSOP-16kRn嘉泰姆	QFN4x4-16kRn嘉泰姆
1kRn嘉泰姆	15kRn嘉泰姆		BOOTkRn嘉泰姆	This pin provides the bootstrap voltage to the upper gate driver for driving the N-channel MOSFET. An external capacitor from PHASE to BOOT, an internaldiode, and the power supply voltage VCC12, generates the bootstrap voltagekRn嘉泰姆 for the upper gate diver (UGATE).kRn嘉泰姆
2kRn嘉泰姆	2kRn嘉泰姆	16kRn嘉泰姆	FS_DISkRn嘉泰姆	This pin provides shutdown function. When pulling low the FS_DIS pin near GND will shutdown both regulators; almost any NFET or other pull-down device (< 1k. impedance) should work. Upon release of the FS_DIS pin, it willkRn嘉泰姆 enable both outputs back into regulation.kRn嘉泰姆
3kRn嘉泰姆	3kRn嘉泰姆	1kRn嘉泰姆	COMPkRn嘉泰姆	This pin is the output of PWM error amplifier. It is used to set the compensation components.kRn嘉泰姆
4kRn嘉泰姆	4kRn嘉泰姆	2kRn嘉泰姆	FBkRn嘉泰姆	This pin is the inverting input of the PWM error amplifier. It is used to set the output voltage and the compensation components. This pin is also monitoredkRn嘉泰姆 for under-voltage protection, when the FB voltage is under 50% of referencekRn嘉泰姆 voltage (0.4V), both outputs will be shutdowned immediately.kRn嘉泰姆
5kRn嘉泰姆	5kRn嘉泰姆	3kRn嘉泰姆	DRIVEkRn嘉泰姆	This pin drives the gate of an external N-channel MOSFET for linear regulator.kRn嘉泰姆 It is also used to set the compensation for some specific applications, forkRn嘉泰姆 example, with low values of output capacitance and ESR.kRn嘉泰姆
6kRn嘉泰姆	6kRn嘉泰姆	4kRn嘉泰姆	FBLkRn嘉泰姆	This pin is the inverting input of the linear regulator error amplifier. It is used tokRn嘉泰姆 set the output voltage. This pin is also monitored for under-voltage protection,when the FBL voltage is under 50% of reference voltage(0.4V), both outputs will be shutdown immediately.kRn嘉泰姆
7kRn嘉泰姆	7,8kRn嘉泰姆	5,6kRn嘉泰姆	GNDkRn嘉泰姆	This pin is the signal ground pin. Connect the GND pin to a good ground plane.kRn嘉泰姆
8kRn嘉泰姆	9,10kRn嘉泰姆	7,8kRn嘉泰姆	VCC12kRn嘉泰姆	Power supply input pin. Connect a nominal 12V power supply to this pin. Thepower- on reset function monitors the input voltage at this pin. It is recommended that a decoupling capacitor (1 to 10μF) be connected to GND for noise decoupling.kRn嘉泰姆
9kRn嘉泰姆	11kRn嘉泰姆	9kRn嘉泰姆	REF_OUTkRn嘉泰姆	This pin provides a buffed voltage, which is from internal reference voltage. It is recommended that a 1mF capacitor is connected to ground for stability.kRn嘉泰姆 When VOCSET is above 1V, the REF_OUT buffer will be closed, the VREF_OUT is 0V.kRn嘉泰姆
10kRn嘉泰姆	12kRn嘉泰姆	10kRn嘉泰姆	OCSETkRn嘉泰姆	Connect a resistor (ROCSET) from this pin to GND, an internal 40mA current source will flow through this resistor and create a voltage drop. When VCC12 reaches the POR rising threshold voltage, the voltage drop of ROCSET will bekRn嘉泰姆 memoried and compared with the voltage across the lower MOSFET. The threshold of the over current limit is therefore given by: IOCSET × ROCSET ILIMIT = RDS(ON)(LOW − Side)kRn嘉泰姆 The CXSD6273 has a internal OCP voltage source, and the value is around 0.25V. When the ROCSET x IOCSET is bigger than 0.25V or the OCSET PIN is floating (no ROCSET resistor), the over current threshold will be the internal default value 0.25V.kRn嘉泰姆
11kRn嘉泰姆	13kRn嘉泰姆	11kRn嘉泰姆	LGATEkRn嘉泰姆	This pin is the gate driver for the lower MOSFET of PWM output.kRn嘉泰姆
12kRn嘉泰姆	14kRn嘉泰姆	12kRn嘉泰姆	PGNDkRn嘉泰姆	This pin is the power ground pin for the lower gate driver. It should be tied to GND pin on the board.kRn嘉泰姆
13kRn嘉泰姆	15kRn嘉泰姆	13kRn嘉泰姆	PHASEkRn嘉泰姆	This pin is the return path for the upper gate driver. Connect this pin to the upper MOSFET source, and connect a capacitor to BOOT for the bootstrap voltage. This pin is also used to monitor the voltage drop across the lowerkRn嘉泰姆 MOSFET for over-current protection.kRn嘉泰姆
14kRn嘉泰姆	16kRn嘉泰姆	14kRn嘉泰姆	UGATEkRn嘉泰姆	This pin is the gate driver for the upper MOSFET of PWM output.kRn嘉泰姆

六.电路原理图kRn嘉泰姆

kRn嘉泰姆

七,功能概述kRn嘉泰姆

Function Description (Cont.)kRn嘉泰姆

Over-Current Protection (Cont.)kRn嘉泰姆
When OCSET PIN is floating, the VOCSET will be pulled high and the over current threshold will be thekRn嘉泰姆

internal default value 0.25V. When the voltage drop across the lower MOSFET’s RDS(ON) is larger thankRn嘉泰姆

0.25V, an over-cur-rent condition is detected, the controller will shutdown the IC directly, and latch kRn嘉泰姆

the converter’s output. kRn嘉泰姆
Over Voltage ProtectionkRn嘉泰姆
The FB pin is monitored during converter operation by its own Over Voltage(OV) comparator. If thekRn嘉泰姆

FB voltage is over 135% of the reference voltage, the controller will make Low-Side gate signal fully kRn嘉泰姆

turn on until the fault events are removed.kRn嘉泰姆
Under Voltage ProtectionkRn嘉泰姆
The FBL pin is monitored during converter operation by its own Under Voltage (UV) comparator. If kRn嘉泰姆

the FBL voltage drop below 50% of the reference voltage (50% of 0.8V =0.4V), a fault signal is kRn嘉泰姆

internally generated, and the de-vice turns off both high-side and low-side MOSFET and the kRn嘉泰姆

converter’s output is latched to be floating. The con-troller will shutdown the IC directly.kRn嘉泰姆
Shutdown and EnablekRn嘉泰姆
Pulling low the FS_DIS pin near GND by an open drain transistor or other pull-down device kRn嘉泰姆

(<1k. impedance)will shutdown both regulators. Upon release of the FS_DIS pin, it willkRn嘉泰姆

enable both outputs back into regulation. In shutdown mode, the UGATE and LGATEkRn嘉泰姆

turn off and pull to PHASE and GND respectively.kRn嘉泰姆

八,相关产品 更多同类产品...... kRn嘉泰姆

Switching Regulator > Buck ControllerkRn嘉泰姆
Part_No kRn嘉泰姆	Package kRn嘉泰姆	ArchikRn嘉泰姆 tectukRn嘉泰姆	PhasekRn嘉泰姆	No.ofkRn嘉泰姆 PWMkRn嘉泰姆 OutputkRn嘉泰姆	Output kRn嘉泰姆 CurrentkRn嘉泰姆 (A) kRn嘉泰姆	InputkRn嘉泰姆 Voltage (V) kRn嘉泰姆		ReferencekRn嘉泰姆 VoltagekRn嘉泰姆 (V) kRn嘉泰姆	Bias kRn嘉泰姆 VoltagekRn嘉泰姆 (V) kRn嘉泰姆	QuiescentkRn嘉泰姆 CurrentkRn嘉泰姆 (uA) kRn嘉泰姆
Part_No kRn嘉泰姆	Package kRn嘉泰姆	ArchikRn嘉泰姆 tectukRn嘉泰姆	PhasekRn嘉泰姆	No.ofkRn嘉泰姆 PWMkRn嘉泰姆 OutputkRn嘉泰姆	Output kRn嘉泰姆 CurrentkRn嘉泰姆 (A) kRn嘉泰姆	minkRn嘉泰姆	maxkRn嘉泰姆	ReferencekRn嘉泰姆 VoltagekRn嘉泰姆 (V) kRn嘉泰姆	Bias kRn嘉泰姆 VoltagekRn嘉泰姆 (V) kRn嘉泰姆	QuiescentkRn嘉泰姆 CurrentkRn嘉泰姆 (uA) kRn嘉泰姆
CXSD6273kRn嘉泰姆	SOP-14kRn嘉泰姆 QSOP-16kRn嘉泰姆 QFN4x4-16kRn嘉泰姆	VM kRn嘉泰姆	1 kRn嘉泰姆	1 kRn嘉泰姆	30kRn嘉泰姆	2.9 kRn嘉泰姆	13.2kRn嘉泰姆	0.9kRn嘉泰姆	12 kRn嘉泰姆	8000kRn嘉泰姆
CXSD6274kRn嘉泰姆	SOP-8kRn嘉泰姆	VM kRn嘉泰姆	1kRn嘉泰姆	1kRn嘉泰姆	20kRn嘉泰姆	2.9 kRn嘉泰姆	13.2 kRn嘉泰姆	0.8kRn嘉泰姆	12kRn嘉泰姆	5000kRn嘉泰姆
CXSD6274CkRn嘉泰姆	SOP-8kRn嘉泰姆	VMkRn嘉泰姆	1kRn嘉泰姆	1kRn嘉泰姆	20kRn嘉泰姆	2.9kRn嘉泰姆	13.2kRn嘉泰姆	0.8kRn嘉泰姆	12kRn嘉泰姆	5000kRn嘉泰姆
CXSD6275kRn嘉泰姆	QFN4x4-24kRn嘉泰姆	VMkRn嘉泰姆	2kRn嘉泰姆	1kRn嘉泰姆	60kRn嘉泰姆	3.1kRn嘉泰姆	13.2kRn嘉泰姆	0.6kRn嘉泰姆	12kRn嘉泰姆	5000kRn嘉泰姆
CXSD6276kRn嘉泰姆	SOP-8kRn嘉泰姆	VMkRn嘉泰姆	1kRn嘉泰姆	1kRn嘉泰姆	20kRn嘉泰姆	2.2kRn嘉泰姆	13.2kRn嘉泰姆	0.8kRn嘉泰姆	5~12kRn嘉泰姆	2100kRn嘉泰姆
CXSD6276AkRn嘉泰姆	SOP-8kRn嘉泰姆	VMkRn嘉泰姆	1kRn嘉泰姆	1kRn嘉泰姆	20kRn嘉泰姆	2.2kRn嘉泰姆	13.2kRn嘉泰姆	0.8kRn嘉泰姆	5~12kRn嘉泰姆	2100kRn嘉泰姆
CXSD6277/A/BkRn嘉泰姆	SOP8\|TSSOP8kRn嘉泰姆	VMkRn嘉泰姆	1kRn嘉泰姆	1kRn嘉泰姆	5kRn嘉泰姆	5kRn嘉泰姆	13.2kRn嘉泰姆	1.25\|0.8kRn嘉泰姆	5~12kRn嘉泰姆	3000kRn嘉泰姆
CXSD6278kRn嘉泰姆	SOP-8kRn嘉泰姆	VMkRn嘉泰姆	1kRn嘉泰姆	1kRn嘉泰姆	10kRn嘉泰姆	3.3kRn嘉泰姆	5.5kRn嘉泰姆	0.8kRn嘉泰姆	5kRn嘉泰姆	2100kRn嘉泰姆
CXSD6279BkRn嘉泰姆	SOP-14kRn嘉泰姆	VM kRn嘉泰姆	1kRn嘉泰姆	1kRn嘉泰姆	10kRn嘉泰姆	5kRn嘉泰姆	13.2kRn嘉泰姆	0.8kRn嘉泰姆	12kRn嘉泰姆	2000kRn嘉泰姆
CXSD6280kRn嘉泰姆	TSSOP-24kRn嘉泰姆 \|QFN5x5-32kRn嘉泰姆	VMkRn嘉泰姆	1kRn嘉泰姆	2kRn嘉泰姆	20kRn嘉泰姆	5kRn嘉泰姆	13.2kRn嘉泰姆	0.6kRn嘉泰姆	5~12kRn嘉泰姆	4000kRn嘉泰姆
CXSD6281NkRn嘉泰姆	SOP14kRn嘉泰姆 QSOP16kRn嘉泰姆 QFN-16kRn嘉泰姆	VMkRn嘉泰姆	1kRn嘉泰姆	1kRn嘉泰姆	30kRn嘉泰姆	2.9kRn嘉泰姆	13.2kRn嘉泰姆	0.9kRn嘉泰姆	12kRn嘉泰姆	4000kRn嘉泰姆
CXSD6282kRn嘉泰姆	SOP-14kRn嘉泰姆	VMkRn嘉泰姆	1kRn嘉泰姆	1kRn嘉泰姆	30kRn嘉泰姆	2.2kRn嘉泰姆	13.2kRn嘉泰姆	0.6kRn嘉泰姆	12kRn嘉泰姆	5000kRn嘉泰姆
CXSD6282AkRn嘉泰姆	SOP-14kRn嘉泰姆	VMkRn嘉泰姆	1kRn嘉泰姆	1kRn嘉泰姆	30kRn嘉泰姆	2.2kRn嘉泰姆	13.2kRn嘉泰姆	0.6kRn嘉泰姆	12kRn嘉泰姆	5000kRn嘉泰姆
CXSD6283kRn嘉泰姆	SOP-14kRn嘉泰姆	VMkRn嘉泰姆	1kRn嘉泰姆	1kRn嘉泰姆	25kRn嘉泰姆	2.2kRn嘉泰姆	13.2kRn嘉泰姆	0.8kRn嘉泰姆	12kRn嘉泰姆	5000kRn嘉泰姆
CXSD6284/AkRn嘉泰姆	LQFP7x7 48kRn嘉泰姆 TQFN7x7-48kRn嘉泰姆	VMkRn嘉泰姆	1kRn嘉泰姆	6kRn嘉泰姆	0.015kRn嘉泰姆	1.4kRn嘉泰姆	6.5kRn嘉泰姆	-kRn嘉泰姆	5kRn嘉泰姆	1800kRn嘉泰姆
CXSD6285kRn嘉泰姆	TSSOP-24PkRn嘉泰姆	VMkRn嘉泰姆	1kRn嘉泰姆	2kRn嘉泰姆	20kRn嘉泰姆	2.97kRn嘉泰姆	5.5kRn嘉泰姆	0.8kRn嘉泰姆	5~12kRn嘉泰姆	5000kRn嘉泰姆
CXSD6286kRn嘉泰姆	SOP-14kRn嘉泰姆	VMkRn嘉泰姆	1kRn嘉泰姆	1kRn嘉泰姆	10kRn嘉泰姆	5kRn嘉泰姆	13.2kRn嘉泰姆	0.8kRn嘉泰姆	12kRn嘉泰姆	3000kRn嘉泰姆
CXSD6287kRn嘉泰姆	SOP-8-P\|DIP-8kRn嘉泰姆	VMkRn嘉泰姆	1kRn嘉泰姆	1kRn嘉泰姆	30kRn嘉泰姆	2.9kRn嘉泰姆	13.2kRn嘉泰姆	1.2kRn嘉泰姆	12kRn嘉泰姆	3000kRn嘉泰姆
CXSD6288kRn嘉泰姆	SSOP28kRn嘉泰姆 QFN4x4-24kRn嘉泰姆	VMkRn嘉泰姆	1kRn嘉泰姆	2kRn嘉泰姆	20kRn嘉泰姆	5kRn嘉泰姆	24kRn嘉泰姆	0.9kRn嘉泰姆	5</kRn嘉泰姆

上一篇：CXSU63117固定工作频率的电流模式控制的的同步降压转换芯片2.5V到5.5V的输入1A的输出1A同步降压DC/DC转换器

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