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)
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)
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)
VGA
Mother Board
四.下载产品资料PDF文档
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五, 产品封装图 (Package)
六.电路原理图
七,功能概述
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 |
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|
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 |
|||||||||
|
SOP-14 QSOP-16 QFN4x4-16 |
VM |
1 |
1 |
30 |
2.9 |
13.2 |
0.9 |
12 |
8000 |
|
|
SOP-8 |
VM |
1 |
1 |
20 |
2.9 |
13.2 |
0.8 |
12 |
5000 |
|
|
SOP-8 |
VM |
1 |
1 |
20 |
2.9 |
13.2 |
0.8 |
12 |
5000 |
|
|
QFN4x4-24 |
VM |
2 |
1 |
60 |
3.1 |
13.2 |
0.6 |
12 |
5000 |
|
|
SOP-8 |
VM |
1 |
1 |
20 |
2.2 |
13.2 |
0.8 |
5~12 |
2100 |
|
|
SOP-8 |
VM |
1 |
1 |
20 |
2.2 |
13.2 |
0.8 |
5~12 |
2100 |
|
|
SOP8|TSSOP8 |
VM |
1 |
1 |
5 |
5 |
13.2 |
1.25|0.8 |
5~12 |
3000 |
|
|
SOP-8 |
VM |
1 |
1 |
10 |
3.3 |
5.5 |
0.8 |
5 |
2100 |
|
|
SOP-14 |
VM |
1 |
1 |
10 |
5 |
13.2 |
0.8 |
12 |
2000 |
|
|
TSSOP-24 |QFN5x5-32 |
VM |
1 |
2 |
20 |
5 |
13.2 |
0.6 |
5~12 |
4000 |
|
|
SOP14 QSOP16 QFN-16 |
VM |
1 |
1 |
30 |
2.9 |
13.2 |
0.9 |
12 |
4000 |
|
|
SOP-14 |
VM |
1 |
1 |
30 |
2.2 |
13.2 |
0.6 |
12 |
5000 |
|
|
SOP-14 |
VM |
1 |
1 |
30 |
2.2 |
13.2 |
0.6 |
12 |
5000 |
|
|
SOP-14 |
VM |
1 |
1 |
25 |
2.2 |
13.2 |
0.8 |
12 |
5000 |
|
|
LQFP7x7 48 TQFN7x7-48 |
VM |
1 |
6 |
0.015 |
1.4 |
6.5 |
- |
5 |
1800 |
|
|
TSSOP-24P |
VM |
1 |
2 |
20 |
2.97 |
5.5 |
0.8 |
5~12 |
5000 |
|
|
SOP-14 |
VM |
1 |
1 |
10 |
5 |
13.2 |
0.8 |
12 |
3000 |
|
|
SOP-8-P|DIP-8 |
VM |
1 |
1 |
30 |
2.9 |
13.2 |
1.2 |
12 |
3000 |
|
|
SSOP28 QFN4x4-24 |
VM |
1 |
2 |
20 |
5 |
24 |
0.9 |
5 |
1200 |
|
|
SOP-20 |
VM |
1 |
2 |
20 |
2.2 |
13.2 |
0.6 |
5~12 |
4000 |
|
|
SOP8|DFN3x3-10 |
VM |
1 |
2 |
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