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參數(shù)資料
| 型號： | RT8100AGQV |
| 廠商： | Richtek Technology Corporation |
| 英文描述： | Synchronous buck PWM DC/DC with Dual Voltage Control Mode |
| 中文描述： | 同步降壓PWM直流/雙直流電壓控制模式 |
| 文件頁數(shù)： | 5/18頁 |
| 文件大?。?/td> | 434K |
| 代理商： | RT8100AGQV |
RT8100A
Preliminary
5
DS8100A-01 August 2007
www.richtek.com
Function Block Diagram
Operation
RT8100A is a highly flexible, high performance and high
precision synchronous buck controller specifically
designed for high-end graphic core power supply as well
as DDR applications, with highly reduced external
components and costs.
RT8100A uses RichTek proprietary Analogous Current
Mode
TM
topology which mimics the traditional peak current
mode by sensing the valley current of the inductor via DCR
sensing techniques and simulating the current ramp with
an artificial ramp set externally. The Analogous Current
Mode topology benefits all the advantages of peak current
mode converter with much higher noise immunity than
conventional one. Since the compensation is easier and
with less constraint than that in voltage mode, using low
ESR output capacitor as MLCC is possible, which therefore
dramatically reduce the board size as well as the cost and
has better transient response due to higher control
bandwidth. RT8100A also adopts V
IN
feedfoward for ramp
setting, which decreases the complexity for compensation
by keeping the modulator gain constant along line
variations.
The wide input voltage range of the converter ranges from
3.3V to 12V. The output voltage can be set from 0.8V to
3.3V with external resistor divider.
The power sequence of RT8100A includes :
1 : POR function
2 : V
IN
power supply detection
3 : PI pin setting to enable the whole chip.
The external elements selection of RT8100A includes :
1 : RT pin resister to GND to set the operation frequency
of the chip.
2 : CSN pin resister to set the current gain(ratio of
inductance
current I
L
and sensed current Ix).
3 : RR pin resister to V
IN
to set the slope of the V
IN
feed
forward ramp and the effective slope compens
ation of
current mode.
4 : Use R
CSN
resister to set the over current level.
5 : Capacitor at SS pin to set the soft-start time.
6 : Type two compensation at COMP pin.
EN & V
IN
Detection
Soft Stsrt
PWM
Logic
Ramp
Current
Generator
Power_sel
V
REF
_sel
Oscillator free Running 200kHz
Current to
Voltage
Converter
V
REF
5VSB
LGATE
CLK
PHASE
PI
RT
CSN
CSP
RR
I_IND
SS
PVCC
12VCC
BOOT
UGATE
GND
+
-
PWMCP
+
-
+
-
SN
SN
OCP
GM
To RR Pin
CLK
COMP
FB
POR
PVCC
Dead
Time
Control
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| RT8100 | Synchronous buck PWM DC/DC with Dual Voltage Control Mode |
| RT8100GQV | Synchronous buck PWM DC/DC with Dual Voltage Control Mode |
| RT8100PQV | Synchronous buck PWM DC/DC with Dual Voltage Control Mode |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| RT8100APQV | 制造商:RICHTEK 制造商全稱:Richtek Technology Corporation 功能描述:Synchronous buck PWM DC/DC with Dual Voltage Control Mode |
| RT8100GQV | 制造商:RICHTEK 制造商全稱:Richtek Technology Corporation 功能描述:Synchronous buck PWM DC/DC with Dual Voltage Control Mode |
| RT8100PQV | 制造商:RICHTEK 制造商全稱:Richtek Technology Corporation 功能描述:Synchronous buck PWM DC/DC with Dual Voltage Control Mode |
| RT8101 | 制造商:RICHTEK 制造商全稱:Richtek Technology Corporation 功能描述:12V Synchronous Buck PWM DC-DC |
| RT8101AGS | 功能描述:IC REG CTRLR BUCK PWM VM 8-SOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標準包裝:2,000 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:1MHz 占空比:50% 電源電壓:9 V ~ 10 V 降壓:無 升壓:是 回掃:是 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 85°C 封裝/外殼:8-TSSOP（0.173"，4.40mm 寬） 包裝:帶卷 (TR) |
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