CXSD6294两相PWM控制芯片为高级显卡和主板应用提供了一个精确的电压调节系统功率MOSFET驱动器与控制器

CXSD6294是一款两相脉宽调制控制芯片，为高级图形卡和主板应用提供了一个精确的电压调节系统。功率MOSFET驱动器与控制器集成外部部件的数量为一个节省成本和空间的电源管理解决方案。CXSD6294采用电压模式的脉宽调制结构，与将频率从100kHz调整到800kHz。设备使用电流传感电感的dcr具有较高的效率

目录

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)   

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      The CXSD6294, two-phase PWM control IC, provides a precision voltage regulation system for advanced graphic card and motherboard applications.
The integration of power MOSFET drivers into the controller IC and reduces
the number of external parts for a cost and space saving power management solution.
       The CXSD6294 uses a voltage-mode PWM architecture,operating with
adjust frequency from 100kHz to 800kHz.The device uses the voltage across
the DCRs of the inductors for current sensing achieves high efficiency. The
device integrates adjustable load line voltage positioning (droop) and adopts low side RDS_ON for channel-cur-rent balance.
       The automatic phase reduction and over-current protection are accomplished through continuous inductor DCRs current sensing.The CXSD6294 also implement a one-bit VID control operation in which the feedback voltage is regulated and
tracks external input reference voltage.This controller protection features include over temperature(OTP), over-voltage(OVP), under-voltage(UVP) and over-current protections (OCP).The device also provides a power-on-reset function and
a programmable soft-start to prevent wrong operation and limit the input surge current during power-on or start-up
         The CXSD6294 is available in QFN4x4-24 packages.
二.产品特点(Features)

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1.)Voltage-Mode Operation with Current Sharing
2.)Operate with 4.5V~13.2V Supply Voltage
3.)Support Single and Two-Phase Operations
4.)+2% Reference Voltage Accuracy Over Temperature
5.)Loss-Less Inductor DCR Current Sensing
6.)Adjustable Over Current Protection use DCR Current Sensing
7.)Programmable PWM Switching Frequency from 100kHz to 800kHz
8.)Dynamic Output Voltage Adjustment Adjustable Soft-start
     QFN4x4-24 Package
9.)Halogen and Lead Free Available (RoHS Compliant)
三,应用范围 (Applications)

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   VGA
   Mother Board
四.下载产品资料PDF文档 

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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！

 

五, 产品封装图 (Package)

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六.电路原理图

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七,功能概述

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Offset Current Adjust
The CXSD6294 integrated IOFS allows the offset current to adjust phase current. The IOFS pin voltage is nominal
0.5V when connecting a resistor to GND and 1.5V when connecting a resistor to VREF. Connecting a resistor from
IOFS pin to GND generate a current source as:IOFS= 0.5V/RIOFS
This current is add to phase 1 current signal ISEN1 for cur-rent balance. Consequently, phase 2 will share more
percentage of output current. Connecting a resistor from
IOFS pin to VREF generates a current source as:
IOFS= (2V-1.5V) /RIOFS
This current is add to phase 2 current signal ISEN2 for cur-rent balance. Consequently, phase 1 will share more
percentage of output current. 
 Over-Temperature Protection (OTP)
The over-temperature circuit limits the junction tempera-ture of the CXSD6294. When the junction temperature 

exo ceeds 150 C, a thermal sensor pulls UGTAEx and LGATEx low, allowing the devices to cool. The thermal 

sensor allows the converters to start a soft-start process and regulates the output voltage again after the 

junction temo  perature cools by 20 C. The OTP is designed with a 20 C hysteresis to lower the average

 Junction Temperature (TJ) during continuous thermal overload conditions increasing the lifetime of the device. 
OVP
The over-voltage protection (OVP) circuit monitors the FB (VFB) voltage to prevent the output from over-voltage.

When the V FB rises to 130% of the EAP voltage (V EAP), the JTMA 8700 turns off high-side and turn on low-side
MOSFETs to sink output voltage (VOUT). As soon as the VFB falls below 110% of V EAP, the OVP comparator is
disengaged. The chip will restore its normal operation.
UVP
The under-voltage protection circuit monitors the voltage on FB (VFB) by Under-Voltage (UV) comparator to

 protect the PWM converter against short-circuit conditions. When the VFB falls below the falling UVP threshold 

(50% VEAP), a fault signal is generated and the device turns off highside and low-side MOSFETs. The converter 

shuts down and the output is latched to be floating. The CXSD6294 will initials a soft-start process until re-cycle

 RT/EN or VCC
八,相关产品                     更多同类产品...... 

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Switching Regulator >   Buck Controller
Part_No	Package	Archi tectu	Phase	No.of PWM Output	Output  Current (A)	Input Voltage (V)		Reference Voltage (V)	Bias  Voltage (V)	Quiescent Current (uA)
						min	max
CXSD6273	SOP-14 QSOP-16 QFN4x4-16	VM	1	1	30	2.9	13.2	0.9	12	8000
CXSD6274	SOP-8	VM	1	1	20	2.9	13.2	0.8	12	5000
CXSD6274C	SOP-8	VM	1	1	20	2.9	13.2	0.8	12	5000
CXSD6275	QFN4x4-24	VM	2	1	60	3.1	13.2	0.6	12	5000
CXSD6276	SOP-8	VM	1	1	20	2.2	13.2	0.8	5~12	2100
CXSD6276A	SOP-8	VM	1	1	20	2.2	13.2	0.8	5~12	2100
CXSD6277/A/B	SOP8|TSSOP8	VM	1	1	5	5	13.2	1.25|0.8	5~12	3000
CXSD6278	SOP-8	VM	1	1	10	3.3	5.5	0.8	5	2100
CXSD6279B	SOP-14	VM	1	1	10	5	13.2	0.8	12	2000
CXSD6280	TSSOP-24 |QFN5x5-32	VM	1	2	20	5	13.2	0.6	5~12	4000
CXSD6281N	SOP14 QSOP16 QFN-16	VM	1	1	30	2.9	13.2	0.9	12	4000
CXSD6282	SOP-14	VM	1	1	30	2.2	13.2	0.6	12	5000
CXSD6282A	SOP-14	VM	1	1	30	2.2	13.2	0.6	12	5000
CXSD6283	SOP-14	VM	1	1	25	2.2	13.2	0.8	12	5000
CXSD6284/A	LQFP7x7 48 TQFN7x7-48	VM	1	6	0.015	1.4	6.5	-	5	1800
CXSD6285	TSSOP-24P	VM	1	2	20	2.97	5.5	0.8	5~12	5000
CXSD6286	SOP-14	VM	1	1	10	5	13.2	0.8	12	3000
CXSD6287	SOP-8-P|DIP-8	VM	1	1	30	2.9	13.2	1.2	12	3000
CXSD6288	SSOP28 QFN4x4-24	VM	1	2	20	5	24	0.9	5	1200
CXSD6289	SOP-20	VM	1	2	20	2.2	13.2	0.6	5~12	4000
CXSD6290	SOP8|DFN3x3-10	VM	1	2	-	-	-	-	5~12	550
CXSD6291HC	DIP8|SOP-8	VM	1	1	1	1.2	9	24	5	9 ~ 24
CXSD6292	SSOP16 QFN4x4-16 TQFN3x3-16	VM	1	1	25	3	25	0.6	5	1700
CXSD6293	TDFN3x3-10	COT	1	1	25	3	25	0.5	5	350
CXSD6294	QFN4x4-24	CM	2	1	40	4.5	13.2	0.6	5~12	4000
CXSD6295	SOP8P TDFN3x3-10	VM	1	1	20	3	13.2	0.8	5~12	2500
CXSD6296A|B|C|D	SOP8P	VM	1	1	25	3	13.2	0.6|0.8	5~12	1200
CXSD6297	TDFN3x3-10	VM	1	1	25	4	13.2	0.8	5~12	2000
CXSD6298	TDFN3x3-10	COT	1	1	25	4.5	25	0.6	5~12	80
CXSD6299|A	SOP-8P	VM	1	1	25	4.5	13.2	0.8	5~12	16000
CXSD62100	TQFN3x3-10	VM	1	1	25	4.5	13.2	0.6	5~12	2500
CXSD62101|L	TDFN3x3-10	COT	1	1	30	3	25	0.8	5~12	2000
CXSD62102	TQFN3x3-16	COT	1	1	30	1.8	28	0.6	5	600
CXSD62102A	TQFN 3x3 16	COT	1	1	30	1.8	28	0.6	5	600
CXSD62103	QFN4x4-24	VM	2	1	50	4.5	13.2	0.6	5~12	5000
CXSD62104	TQFN4x4-24	COT	1	2	15	6	25	2	N	550
CXSD62105	TQFN4x4-24	COT	1	2	15	6	25	2	N	550
CXSD62106|A	TQFN4x4-4 TQFN3x3-20	COT	1	2	20	3	28	0.75	5	800
CXSD62107	TQFN3x3-16	COT	1	1	20	1.8	28	0.75	5	400
CXSD62108	QFN3.5x3.5-14 TQFN3x3-16	COT	1	1	20	1.8	28	0.75	5	400
CXSD62109	TQFN3x3-16	COT	1	2	20	1.8	28	0.75	5	400
CXSD62110	QFN3x3-20 TQFN3x3-16	COT	1	2	20	3	28	1.8|1.5|0.5	5	740
CXSD62111	TQFN4x4-24 |QFN3x3-20	CM	1	2	15	5	28	0.5	N	3000
CXSD62112	TDFN3x3-10	COT	1	1	20	1.8	28	0.5	5	250
CXSD62113|C	TQFN3x3-20	COT	1	2	15	6	25	2	N	550
CXSD62113E	TQFN 3x3 20	COT	2	2	11	6	25	2	N	550
CXSD62114	TQFN3x3-20	COT	2	2	11	5.5	25	2	N	280
CXSD62115	QFN4x4-24	VM	2	1	60	3.1	13.2	0.85	12	5000
CXSD62116A|B|C	SOP-8P	VM	1	1	20	2.9	13.2	0.8	12	16000
CXSD62117	SOP-20	VM	2	2	30	10	13.2	1	12	5000
CXSD62118	TDFN3x3-10	COT	1	1	25	1.8	28	0.7	5	250
CXSD62119	TQFN3x3-20	COT	2	1	40	1.8	25	REFIN Setting	5	700
CXSD62120	QFN 3x3 20 TQFN 3x3 16	COT	1	2	20	3	28	1.8|1.5 1.35|1.2 0.5	5	800
CXSD62121A	TQFN3x3 20	COT	1	2	15	3	28	0.75	5	220
CXSD62121B	TQFN3x3 20	COT	1	2	15	3	28	0.75	5	220
CXSD62121	TQFN3x3-20	COT	1	2	20	3	28	0.75	5	180