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参数资料
| 型号： | RT9174CS |
| 厂商： | Richtek Technology Corporation |
| 英文描述： | Triple Linear Regulator Controllers |
| 中文描述： | 三线性稳压器控制器 |
| 文件页数： | 6/8页 |
| 文件大小： | 170K |
| 代理商： | RT9174CS |
RT9174
Preliminary
www.richtek-ic.com.tw
DS9174-00 April 2001
6
Applications Information
Capacitors Selection
A 0.1
F minimum capacitor is recommended
between VDD and ground to increase stability. The
linear controllers use dominant pole compensation
integrated into the error amplifier and are sensitive to
output capacitor selection. When driving external
pass transistor, normally a minimum 470
F capacitor
must be placed at output for stability and good
transient response. When using internal pass
transistor, just need 10
F capacitor for stable.
Pass Transistor Selection
The RT9174 are designed specifically to driver
external NPN or NMOSFET pass transistor for up to
5A output current. The driver could deliver more
100mA when driving NPN transistor and sinking for a
pull up resistor load when driving a NMOSFET.
Typically pass transistor with NPN hfe > 50 at Imax or
NMOSFET Rds-on 100m
are suitable in most
application.
Output Voltage Setting
The RT9174 develop a 0.8V reference voltage,
especially suit for low voltage application. As shown
in Fig. 4, the output voltage could be easy set by R1
& R2 resistor. The divided resistor must keep below
1K
for quick response and stability.
Tri-state Operation
A special Tri-state design is empolyed in the RT9174
for AGP 2X/4X power supply. Typical application
shown the detail circuit. In AGP 2X SELECT = open,
FB1 will be pulled up over 1.3V through R8 to trip the
Tri-state threshold. R8 has to meet the following
relationship:
R8 < 0.75 (V33 - 1.3)
×R2,
if
1.5
0.8
R
3
2
3
=
×
+
.
When in AGP 4X SELECT = GND, VDDQ will work in
normal 1.5V setting.
Layout Considerations
There are two critical layout considerations. One is
the divider resistors should be located to RT9174 as
possible to avoid inducing any noise. The second is
COUT should be put at near the pass transistor to
avoid oscillation.
RT9174
+
1
F
Fig 4
VDD
DRI1
DRI2
DRI3
FB1
FB2
FB3
VDD
R1
R2
VIN
COUT
VOUT
As close as to RT9174
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| RT9174PS | 制造商:Richtek Technology Corporation 功能描述: |
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