參數(shù)資料
型號： RT9174PS
廠商： Richtek Technology Corporation
英文描述： Triple Linear Regulator Controllers
中文描述： 三線性穩(wěn)壓器控制器
文件頁數(shù)： 6/7頁
文件大小： 114K
代理商： RT9174PS
RT9174
Preliminary
6
DS9174-06 March 2007
www.richtek.com
Application Information
Capacitors Selection
A 0.1
μ
F minimum capacitor is recommended between V
DD
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
μ
F capacitor must be placed at output for stability and
good transient response. When using internal pass
transistor, just need 10
μ
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
Ω
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 Figure 4, the
output voltage could be easy set by R1 & R2 resistor.
The divided resistor must keep below 1k
Ω
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 R
8
to trip the Tri-state
threshold. R
8
has to meet the following relationship:
R
8
< 0.75 (V
33
- 1.3) x R
2
,
R
R
3
When in AGP 4X SELECT = GND, V
DDQ
will work in
normal 1.5V setting.
if
1.5
0.8
R
2
3
=
×
+
.
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 C
OUT
should
be put at near the pass transistor to avoid oscillation.
Figure 4
RT9174
VDD
DR11
DR12
DR13
FB1
FB2
FB3
+
C
OUT
R1
R2
V
OUT
V
IN
V
DD
1uF
As close as to RT9174
相關PDF資料
PDF描述
RT9176 5.0 AMP POSITIVE VOLTAGE REGULATOR
RT9176-15GG 5.0 AMP POSITIVE VOLTAGE REGULATOR
RT9176-15GL 5.0 AMP POSITIVE VOLTAGE REGULATOR
RT9176-15GM 5.0 AMP POSITIVE VOLTAGE REGULATOR
RT9176-15PG 5.0 AMP POSITIVE VOLTAGE REGULATOR
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RT9178-26GB 功能描述:IC REG LDO 2.6V .2A SOT23-5 RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 系列:- 標準包裝:50 系列:- 穩(wěn)壓器拓撲結(jié)構(gòu):正，固定式 輸出電壓:2.1V 輸入電壓:最高 7.5V 電壓 - 壓降（標準）:- 穩(wěn)壓器數(shù)量:1 電流 - 輸出:5A（最小值） 電流 - 限制（最小）:5.1A 工作溫度:-40°C ~ 100°C 安裝類型:通孔 封裝/外殼:TO-220-5 供應商設備封裝:TO-220-5 包裝:管件 配用:296-20624-ND - EVAL MOD FOR TPS72518 其它名稱:296-15154-5
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