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參數(shù)資料
| 型號(hào)： | RT9204PS |
| 廠商： | Richtek Technology Corporation |
| 英文描述： | Dual Regulators - Standard Buck PWM DC-DC and Linear Controller |
| 中文描述： | 雙穩(wěn)壓器-標(biāo)準(zhǔn)降壓PWM型DC - DC和線性控制器 |
| 文件頁(yè)數(shù)： | 10/14頁(yè) |
| 文件大小： | 199K |
| 代理商： | RT9204PS |
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RT9204/A
Preliminary
10
DS9204/A-08 March 2007
www.richtek.com
Inductor Selection
The RT9204/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 600kHz,
The V
OUT
ripple is
ESR is COUT capacitor equivalent series resistor
Table 1 shows the ripple voltage of V
OUT
: VIN = 5V
*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
Figure 5
Shutdown
Pulling high the SD pin by a small single transistor can
shutdown the RT9204/A PWM controller as shown in
typical application circuit. Normally SD pin can be floating
because an internal 40
μ
A current source will pull low
the SD shutdown pin voltage.
V
OUT
Inductor
3.3V
2.5V
1.5V
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
1000
μ
F (ESR = 53m
)
1500
μ
F (ESR = 33m
)
3000
μ
F (ESR = 21m
)
0V
2V
4V
I
S
F
T0T1
T2
TIME
T3
COUNT = 1
COUNT = 2
COUNT = 3
OVERLOAD
APPLIED
Figure 6
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
Table 1
V
I
V
O
R
C
D
L
Q
C.C.M.
×
OUT
RIPPLE
ON
(5V - V
)
IL
=
T
L
×
OUT
V
5V
ON
T
= 3.33
ESR
OUT RIPPLE
RIPPLE
V
= IL
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