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参数资料
| 型号： | RT9204CS |
| 厂商： | Richtek Technology Corporation |
| 元件分类： | 线性稳压 |
| 英文描述： | Dual Regulator - Standard Buck PWM DC-DC and Linear Power Controller |
| 中文描述： | 双稳压器-标准降压PWM型DC - DC与线性电源控制器 |
| 文件页数： | 14/14页 |
| 文件大小： | 276K |
| 代理商： | RT9204CS |
Preliminary
RT9204
DS9204-00 February 2002
www.richtek-ic.com.tw
9
Fig. 3
Shutdown
Pulling high the SD pin by a small single transistor
can shutdown the RT9204 PWM controller as shown
in typical application circuit. Normally SD pin can be
floating because an internal 40
A current source will
pull low the SD shutdown pin voltage.
Applications Information
Inductor Selection
The RT9204 was designed for VIN = 5V, step-down
application mainly. Fig.4 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 600kHz,
TON = 3.33
× VOUT/5V
The VOUT ripple is
VOUT RIPPLE = ILRIPPLE
× ESR
ESR is COUT capacitor equivalent series resistor
Table 1 shows the ripple voltage of VOUT: VIN = 5V
*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
Table 1
Fig.4
VOUT
3.3V
2.5V
1.5V
Inductor
2
H5H2H5H2H5H
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
TON
TOFF
TS
VL
VI - VO
- VO
IL = IO
iL
Q
IL
iQ
IQ
iD
ID
C.C.M.
VL
R
VO
L
DC
Q
VI
0V
2V
4V
In
te
rn
a
l
SS
F
B
or
F
B
LV
ol
tag
e
T0T1
T2
T3
TIME
COUNT = 1 COUNT = 2 COUNT = 3
OVERLOAD
APPLIED
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| RT9205ACS | Dual Regulators - Synchronous Buck PWM DC-DC and Linear Controller |
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| RTB-1.5-3P | 3 CONTACT(S), MALE, STRAIGHT TWO PART BOARD CONNECTOR, SOLDER |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| RT9204GS | 制造商:RICHTEK 制造商全称:Richtek Technology Corporation 功能描述:Dual Regulators - Standard Buck PWM DC-DC and Linear Controller |
| RT9204PS | 制造商:RICHTEK 制造商全称:Richtek Technology Corporation 功能描述:Dual Regulators - Standard Buck PWM DC-DC and Linear Controller |
| RT9205 | 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 |
| 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 |
| RT9205_07 | 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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