參數(shù)資料
型號: LTC3853IUJ#TR
廠商: LINEAR TECHNOLOGY CORP
元件分類: 穩(wěn)壓器
英文描述: 0.15 A DUAL SWITCHING CONTROLLER, 830 kHz SWITCHING FREQ-MAX, PQCC40
封裝: 6 X 6 MM, PLASTIC, QFN-40
文件頁數(shù): 22/36頁
文件大?。?/td> 1780K
代理商: LTC3853IUJ#TR
LTC3853
29
3853fa
standard values are 3.3H, 3.3H and 1.5H. At the
maximum input voltage (20V), the ripple will be:
DIL(MAX) =
VOUT
f L
1
VOUT
VIN(MAX)
Channel 1 will have ~2.3A (46%) ripple, and both channel
2 and channel 3 will have ~1.75A (35%) ripple. The peak
inductor current will be the maximum DC value plus one-
half the ripple current, or 6.15A for channel 1 and 5.88A
for channels 2 and 3.
With ILIM high, the equivalent RSENSE resistor value can be
calculated by using the minimum value for the maximum
current sense threshold (65mV).
RSENSE(EQUIV) =
VSENSE(MIN)
ILOAD(MAX) +
DIL(NOM)
2
=
65mV
1.2 5A
+
DIL(MAX)
2
@ 9m
The 1.2 factor adds margin for component variation and
overcurrent headroom during full load transients.
The equivalent RSENSE is the same for channels 1, 2
and 3.
The Vishay IHLP2525CZER3R3M01 (30mΩ DCRMAX at
20°C) and IHLP2525CZER1R5M01 (15mΩ DCRMAX at
20°C,) are chosen. At 100°C, the estimated maximum
DCRvaluesare39.6mVand19.8mV.Thedividerratiosare:
RD =
RSENSE(EQUIV)
DCRMAX at TL(MAX)
=
9m
39.6m
= 0.23;
and
9m
19.8m
@ 0.45
For each channel, 0.1F is selected for C1.
R1|| R2
=
L
(DCRMAX at 20°C) C1
=
3.3
H
30m
0.1F
= 1100 and
1.5
H
15m
0.1F
= 1000
APPLICATIONS INFORMATION
Figure 13. High Efficiency Triple 5V/3.3V/1.2V Step-Down Converter
TG1
TG2
BOOST1,2,3
SW1
SW2
BG1
BG2
SENSE1+
SENSE2+
SENSE1
SENSE2
VFB1
VFB2
ITH1,2,3
VIN
INTVCC
LTC3853
DRVCC12
MODE/PLLIN
20k
1%
FREQ/PLLFLTR
ILIM
PGND
PGOOD12
SGND
EXTVCC
TK/SS1,2,3
VFB3
SENSE3
SENSE3+
SW3
TG3
BG3
RUN1,2,3
PGOOD3
4.75k
1430
20k
1%
3.16k
1nF
63.4k
1%
4.7F
10k
INTVCC
VOUT1
5V
5A
VOUT2
3.3V
5A
20k
1%
3853 F13
2.43k
4.75k
VOUT3
1.2V
5A
VIN
7V TO 20V
CITH1,2,3
RITH1,2,3
0.1F
330F
10V
M1, M2, M3: Si4816BDY
CHANNEL 1: RITH1 = 15k, CITH1 = 1.5nF, CP1 = 220pF
CHANNEL 2: RITH2 = 18k, CITH2 = 1.5nF, CP2 = 220pF
CHANNEL 3: RITH3 = 10k, CITH3 = 1.5nF, CP3 = 330pF
FOR CHANNEL 3, 0.068F WAS SUBSTITUTED FOR 0.1F AND 2.43k WAS SUBSTITUTED
FOR 2.21k TO MEET MINIMUM 15mV RIPPLE AT SENSE INPUT REQUIREMENT
CP1,2,3
22F
50V
CSS1,2,3
0.1F
10pF
1430
3.3H
1.5H
CB1,2,3 0.1F
SW1,2,3
DB1,2,3
M2
M1
M3
0.068F
1.82k
+
330F
6V
+
330F
6V
+
10k
1%
105k
1%
10pF
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