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参数资料
| 型号： | RT9205ACS |
| 厂商： | Richtek Technology Corporation |
| 英文描述： | Dual Regulators - Synchronous Buck PWM DC-DC and Linear Controller |
| 中文描述： | 双稳压器-同步降压PWM型DC - DC和线性控制器 |
| 文件页数： | 3/16页 |
| 文件大小： | 316K |
| 代理商： | RT9205ACS |
Preliminary
RT9205/A
DS9205/A-03 May 2003
www.richtek.com
11
Fig. 5
Applications Information
Inductor Selection
The RT9205/A was designed for VIN = 5V, step-down
application mainly. Fig.6 shows the typical topology
and waveforms of step-down converter.
The ripple current of inductor can be calculated as
follows:
ILRIPPLE = (5V - VOUT)/L × TON
Because operation frequency is fixed at 300kHz,
TON = 3.33 × VOUT/5V
The VOUT ripple is
VOUT RIPPLE = ILRIPPLE × ESR
ESR is the equivalent series resistor of output
capacitor
Table 1 shows the ripple voltage of VOUT at VIN = 5V
Table 1
Fig. 6
VOUT
3.3V
2.5V
1.5V
Inductor
2
H
5
H
2
H
5
H
2
H
5
H
1000
F (ESR=53m)
100mV
40mV
110mV
44mV
93mV
37mV
1500
F (ESR=33m)
62mV
25mV
68mV
28mV
58mV
23mV
3000
F (ESR=21m)
40mV
16mV
43mV
18mV
37mV
15mV
*Refer to Sanyo low ESR series (CE, DX, PX…)
The suggested L and C are as follows:
2
H with ≥ 1500F COUT
5
H with ≥ 1000F COUT
TON
TOFF
TS
VL
VI - VO
- V
O
IL = IO
iL
Q
IL
iQ
IQ
iD
ID
C.C.M.
VL
R
VO
L
DC
Q
VI
0A
0V
2V
4V
In
te
rn
a
l
SS
IN
DU
CT
O
R
CU
RR
E
N
T
T0T1
T2
T3
TIME
COUNT = 1 COUNT = 2 COUNT = 3
OVERLOAD
APPLIED
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相关代理商/技术参数 |
参数描述 |
|---|---|
| RT9205-ACS | 制造商:RICHTEK 制造商全称:Richtek Technology Corporation 功能描述:Dual Regulators - Synchronous Buck PWM DC-DC and Linear Controller |
| RT9205AGS | 制造商:RICHTEK 制造商全称:Richtek Technology Corporation 功能描述:Dual Regulators - Synchronous Buck PWM DC-DC and Linear Controller |
| RT9205APS | 制造商:RICHTEK 制造商全称:Richtek Technology Corporation 功能描述:Dual Regulators - Synchronous Buck PWM DC-DC and Linear Controller |
| RT9205GS | 制造商:RICHTEK 制造商全称:Richtek Technology Corporation 功能描述:Dual Regulators - Synchronous Buck PWM DC-DC and Linear Controller |
| RT9205PS | 制造商:RICHTEK 制造商全称:Richtek Technology Corporation 功能描述:Dual Regulators - Synchronous Buck PWM DC-DC and Linear Controller |
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