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參數(shù)資料
| 型號(hào)： | RT9209AGS |
| 廠商： | Richtek Technology Corporation |
| 英文描述： | Synchronous Buck PWM DC-DC with Enable & PGOOD |
| 中文描述： | 同步降壓PWM直流與直流啟用 |
| 文件頁(yè)數(shù)： | 11/14頁(yè) |
| 文件大?。?/td> | 217K |
| 代理商： | RT9209AGS |
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RT9209/A
11
DS9209/A-08 March 2007
www.richtek.com
Inductor Selection
The RT9209/A was designed for V
IN
= 5V, step-down
application mainly. Figure 4 shows the typical topology
and waveforms of step-down converter.
The ripple currents of inductor can be calculated as follows:
Because operation frequency is fixed at 260kHz/400kHz,
The V
OUT
ripple is
ESR is output capacitor equivalent series resistor
Figure 3
Figure 4
×
OUT
RIPPLE
ON
(5V - V
)
IL
=
T
L
×
×
OUT
OUT
ON
V
V
T
= 3.85
, or 2.5
5V
5V
×
ESR
OUT RIPPLE
RIPPLE
V
= IL
0A
0V
2V
4V
I
S
I
T1
T2
T3
TIME
COUNT = 1
COUNT = 2
COUNT = 3
OVERLOAD
APPLIED
T0
I
D
i
D
i
Q
I
Q
uQ
uI
L
i
L
I
L
= I
O
V
L
V
I
- V
O
- V
O
T
S
T
ON
T
OFF
V
I
V
O
R
C
D
L
Q
C.C.M.
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PDF描述 |
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| RT9209APS | Synchronous Buck PWM DC-DC with Enable & PGOOD |
| RT9209GS | Synchronous Buck PWM DC-DC with Enable & PGOOD |
| RT9209PS | Synchronous Buck PWM DC-DC with Enable & PGOOD |
| RT9210 | Dual 5V Synchronous Buck DC-DC PWM Controller for DDR Memory VDDQ and VTT Termination |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| RT9209APS | 制造商:RICHTEK 制造商全稱:Richtek Technology Corporation 功能描述:Synchronous Buck PWM DC-DC with Enable & PGOOD |
| RT9209GS | 制造商:RICHTEK 制造商全稱:Richtek Technology Corporation 功能描述:Synchronous Buck PWM DC-DC with Enable & PGOOD |
| RT9209PS | 制造商:RICHTEK 制造商全稱:Richtek Technology Corporation 功能描述:Synchronous Buck PWM DC-DC with Enable & PGOOD |
| RT9210 | 制造商:RICHTEK 制造商全稱:Richtek Technology Corporation 功能描述:Dual 5V Synchronous Buck DC-DC PWM Controller for DDR Memory VDDQ and VTT Termination |
| RT9210GC | 制造商:RICHTEK 制造商全稱:Richtek Technology Corporation 功能描述:Dual 5V Synchronous Buck DC-DC PWM Controller for DDR Memory VDDQ and VTT Termination |
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