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参数资料
| 型号： | LTC3853IUJ#TR |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 0.15 A DUAL SWITCHING CONTROLLER, 830 kHz SWITCHING FREQ-MAX, PQCC40 |
| 封装： | 6 X 6 MM, PLASTIC, QFN-40 |
| 文件页数： | 24/36页 |
| 文件大小： | 1780K |
| 代理商： | LTC3853IUJ#TR |
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LTC3853
30
3853fa
For channel 1, the DCRSENSE filter/divider values are:
R1
=
R1|| R2
RD
=
1100
0.23
@ 4.75k;
R2
=
R1 RD
1
RD
=
4.75k 0.23
1
0.23
@ 1430
The power loss in R1 at the maximum input voltage is:
PLOSSR1=
(VIN(MAX) VOUT) VOUT
R1
=
(20V
5V) 5V
4.75k
= 15.8mW
The respective values for Channel 2 are R1 = 4.75k, R2 =
1430Ω; and PLOSSR1 = 11.6mW. And for Channel 3 are
R1 = 2.21k, R2 = 1.82k; and PLOSSR1 = 10.2mW.
BurstModeoperationischosenforhighlightloadefficiency
(Figure 14) by floating the MODE/PLLIN pin. Power loss
due to the DCR sensing network is slightly higher at light
loads than would have been the case with a suitable sense
resistor (9mΩ). At heavier loads, DCR sensing provides
higher efficiency.
ThepowerdissipationonthetopsideMOSFETcanbeeasily
estimated. Choosing a Siliconix Si4816BDY dual MOSFET
results in: RDS(ON) = 0.023Ω/0.016Ω, CMILLER @ 100pF.
At maximum input voltage with T(estimated) = 50°C:
PMAIN =
5V
20V
5
( )2 1+(0.005)(50°C – 25°C)
[
]
0.023
(
)+ 20V
( )2 5A
2
2
( ) 100pF
(
)
1
5 – 2.3
+
1
2.3
500kHz
(
) = 243mW
A short-circuit to ground will result in a folded back cur-
rent of:
ISC =
1/ 3
( )75mV
0.009
–
1
2
90ns(20V)
3.3
H
= 2.5A
with a typical value of RDS(ON) and d = (0.005/°C)(25)
= 0.125. The resulting power dissipated in the bottom
MOSFET is:
PSYNC =
20V – 5V
20V
2.5A
(
)2 1.125
(
) 0.016
(
)
= 84mW
which is less than under full-load conditions.
CIN is chosen for an RMS current rating of at least 2A at
temperature assuming only one channel is on. COUT is
chosen with an ESR of 0.02Ω for low output ripple. The
output ripple in continuous mode will be highest at the
maximum input voltage. The output voltage ripple due to
ESR is approximately:
VORIPPLE = RESR (DIL) = 0.02Ω(1.5A) = 30mVP-P
Figure 14. Design Example Efficiency vs Load
APPLICATIONS INFORMATION
LOAD CURRENT (mA)
0.01
70
EFFICIENCY
(%)
POWER
LOSS
(mW)
80
90
0.1
1
10
60
50
40
100
0.1
1
0.01
10
3853 F14
EFFICIENCY
POWER LOSS
DCR
9m
DCR
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