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參數(shù)資料
| 型號： | RT8803A |
| 廠商： | Richtek Technology Corporation |
| 英文描述： | 2/3-Phase PWM Controller for High-Density Power Supply |
| 中文描述： | 2/3-Phase PWM控制器的高密度電源 |
| 文件頁數(shù)： | 26/27頁 |
| 文件大?。?/td> | 553K |
| 代理商： | RT8803A |
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RT8803A
26
DS8803A-05 August 2007
www.richtek.com
All brandname or trademark belong to their owner respectively
Error Amplifier Characteristic
For fast response of converter to meet stringent output
current transient response, RT8803A provides large slew
rate capability and high gain-bandwidth performance.
Figure 18. Gain-Bandwidth Measurement by signal A
divided by signal B
+
-
EA
4.7k
B
A
V
REF
4.7k
Figure 17. EA Falling Transient with 10pF Loading ;
Slew Rate = 8V/
μ
s
Figure 16. EA Rising Transient with 10pF Loading ;
Slew Rate = 10V/
μ
s
Design Procedure Suggestion
a. Output filter pole and zero (Inductor, output capacitor
value & ESR).
b. Error amplifier compensation & saw-tooth wave
amplitude (compensation network).
c. Kelvin sense for V
CORE
.
Current Loop Setting
a. GM amplifier S/H current (current sense component
DCR, ISP
X
and ISN
X
pin external resistor value).
b. Over-current protection trip point (R
IMAX
resistor).
VRM Load Line Setting
a. Droop amplitude (ADJ pin resistor).
b. No load offset (R
CSN
)
c. DAC offset voltage setting (OFS pin & compensation
network resistor).
d. Temperature coefficient compensation(TSEN external
resister & thermistor, resistor between ADJ and GND.)
Power Sequence & SS
DVD pin external resistor and SS pin capacitor.
PCB Layout
a.Kelvin sense for current sense GM amplifier input.
b.Refer to layout guide for other items.
CH1:(500mV/Div)
CH2:(2V/Div)
EA
Rising Slew Rate
Time (250ns/Div)
V
COMP
V
FB
CH1:(500mV/Div)
CH2:(2V/Div)
EA
Falling Slew Rate
Time (250ns/Div)
V
COMP
V
FB
相關PDF資料 |
PDF描述 |
|---|---|
| RT8805C | Two Phase General Purpose PWM Controller |
| RT8805CGQV | Two Phase General Purpose PWM Controller |
| RT8805CGQVA | Two Phase General Purpose PWM Controller |
| RT8805CPQV | Two Phase General Purpose PWM Controller |
| RT8805CPQVA | Two Phase General Purpose PWM Controller |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| RT8803A_11 | 制造商:RICHTEK 制造商全稱:Richtek Technology Corporation 功能描述:2/3-Phase PWM Controller for High-Density Power Supply |
| RT8805 | 制造商:RICHTEK 制造商全稱:Richtek Technology Corporation 功能描述:Two Phase General Purpose PWM Controller |
| RT8805C | 制造商:RICHTEK 制造商全稱:Richtek Technology Corporation 功能描述:Two Phase General Purpose PWM Controller |
| RT8805CGQV | 制造商:RICHTEK 制造商全稱:Richtek Technology Corporation 功能描述:Two Phase General Purpose PWM Controller |
| RT8805CGQVA | 制造商:RICHTEK 制造商全稱:Richtek Technology Corporation 功能描述:Two Phase General Purpose PWM Controller |
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