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參數(shù)資料
| 型號： | RT9203PS |
| 廠商： | Richtek Technology Corporation |
| 英文描述： | Dual Regulators - Synchronous Buck PWM DC-DC and Linear Controller |
| 中文描述： | 雙穩(wěn)壓器-同步降壓PWM型DC - DC和線性控制器 |
| 文件頁數(shù)： | 12/16頁 |
| 文件大?。?/td> | 228K |
| 代理商： | RT9203PS |
RT9203/A
Preliminary
12
DS9203/A-10 March 2007
www.richtek.com
Inductor Selection
The RT9203/A was designed for V
IN
= 5V, step-down
application mainly. Figure 6 shows the typical topology
and waveforms of step-down converter.
The ripple current of inductor can be calculated as follows:
Because operation frequency is fixed at 300kHz,
The V
OUT
ripple is
ESR is the equivalent series resistor of output capacitor
Table 1 shows the ripple voltage of V
OUT
at
V
IN
= 5V
V
OUT
3.3V
2.5V
1.5V
Inductor
1000
μ
F (ESR=53m
)
1500
μ
F (ESR=33m
)
3000
μ
F (ESR=21m
)
2
μ
H
100mV
62mV
40mV
5
μ
H
40mV
25mV
16mV
2
μ
H
110mV
68mV
43mV
5
μ
H
44mV
28mV
18mV
2
μ
H
93mV
58mV
37mV
5
μ
H
37mV
23mV
15mV
*Refer to Sanyo low ESR series (CE, DX, PX......)
The suggested L and C are as follows:
2
μ
H with
≥
1500
μ
F C
OUT
5
μ
H with
≥
1000
μ
F C
OUT
0A
0V
2V
4V
I
S
I
T1
T2
T3
TIME
COUNT = 1
COUNT = 2
COUNT = 3
OVERLOAD
APPLIED
T0
Figure 5
Figure 6
V
I
V
O
R
C
D
L
Q
C.C.M
T
ON
T
OFF
T
S
V
L
V
I
- V
O
- V
O
uQ
mI
L
I
L
= I
O
i
L
i
Q
I
Q
I
D
i
D
×
OUT
RIPPLE
ON
(5V - V
)
IL
=
T
L
×
OUT
ON
V
T
= 3.33
5V
ESR
OUT RIPPLE
V
RIPPLE
= IL
Table 1
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| RT9204AGS | Dual Regulators - Standard Buck PWM DC-DC and Linear Controller |
| RT9204APS | Dual Regulators - Standard Buck PWM DC-DC and Linear Controller |
| RT9204GS | Dual Regulators - Standard Buck PWM DC-DC and Linear Controller |
| RT9204PS | Dual Regulators - Standard Buck PWM DC-DC and Linear Controller |
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| RT9204 | 制造商:RICHTEK 制造商全稱:Richtek Technology Corporation 功能描述:Dual Regulators - Standard Buck PWM DC-DC and Linear Controller |
| RT9204_07 | 制造商:RICHTEK 制造商全稱:Richtek Technology Corporation 功能描述:Dual Regulators - Standard Buck PWM DC-DC and Linear Controller |
| RT9204AGS | 制造商:RICHTEK 制造商全稱:Richtek Technology Corporation 功能描述:Dual Regulators - Standard Buck PWM DC-DC and Linear Controller |
| RT9204APS | 制造商:RICHTEK 制造商全稱:Richtek Technology Corporation 功能描述:Dual Regulators - Standard Buck PWM DC-DC and Linear Controller |
| RT9204CS | 制造商:RICHTEK 制造商全稱:Richtek Technology Corporation 功能描述:Dual Regulator - Standard Buck PWM DC-DC and Linear Power Controller |
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