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RT9204CS датащи(PDF) 9 Page - Richtek Technology Corporation

номер детали RT9204CS
подробное описание детали  Dual Regulator - Standard Buck PWM DC-DC and Linear Power Controller
PDF  14 Pages
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производитель  RICHTEK [Richtek Technology Corporation]
домашняя страница  http://www.richtek.com
Logo RICHTEK - Richtek Technology Corporation

RT9204CS датащи(HTML) 9 Page - Richtek Technology Corporation

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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
µA 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
µH with ≥ 1500µF COUT
5
µH with ≥ 1000µF COUT
Table 1
Fig.4
VOUT
3.3V
2.5V
1.5V
Inductor
2
µH5µH2µH5µH2µH5µH
1000
µF (ESR = 53mΩ)
100mV
40mV
110mV
44mV
93mV
37mV
1500
µF (ESR = 33mΩ)
62mV
25mV
68mV
28mV
58mV
23mV
3000
µF (ESR = 21mΩ)
40mV
16mV
43mV
18mV
37mV
15mV
TON
TOFF
TS
VL
VI - VO
- VO
IL = IO
iL
µQ
µIL
iQ
IQ
iD
ID
C.C.M.
VL
R
VO
L
DC
Q
VI
0V
2V
4V
T0T1
T2
T3
TIME
COUNT = 1 COUNT = 2 COUNT = 3
OVERLOAD
APPLIED



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