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| 型號(hào)： | LT1941EFE |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Triple Monolithic Switching Regulator |
| 中文描述： | 6 A SWITCHING REGULATOR, 1350 kHz SWITCHING FREQ-MAX, PDSO28 |
| 封裝： | 4.40 MM, PLASTIC, TSSOP-28 |
| 文件頁(yè)數(shù)： | 20/24頁(yè) |
| 文件大?。?/td> | 336K |
| 代理商： | LT1941EFE |
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20
LT1941
1941f
APPLICATIOU
temperature. The output current capability of the third
channel can be calculated from the output currents and
voltages of the other channels, the switching regulator
efficiency (
η
), the ambient temperature (T
A
), the maxi-
mum junction temperature (T
JMAX
) and the thermal
resistance from junction to ambient (
θ
JA
) as follows:
W
U
U
CHANNEL 1 OUTPUT POWER (WATTS)
0
0
C
1
2
3
4
6
1
2
3
4
1941 F09a
5
6
5
CHANNEL 3
OUTPUT POWER (P3)
P3 = 2W
P3 = 4W
P3 = 6W
CHANNEL 1 OUTPUT POWER (WATTS)
0
0
C
0.5
1.0
1.5
2.0
3.0
1
2
1941 F09b
3
2.5
CHANNEL 3
OUTPUT POWER (P3)
P3 = 1W
P3 = 2W
P3 = 3W
Figure 9. Power Output Capability of an Individual Channel Depends on the Output Power of the Other Channels
Power Output Capability for P
DISS
= 2W,
η
= 0.75
Power Output Capability for P
DISS
= 1W,
η
= 0.75
P
T
T
P
P
1
3
3
V
I
V
I
I
P
V
DISS
JMAX
A
JA
DISS
–
=
=
=
–
–
–
θ
η
3
1
2
2
3
Example: LT1941 at V1 = 2.5V, I
1
= 2A, V2 = 3.3V, I
2
= 1A,
V3 = 12V,
η
= 80%, T
A
= 75
°
C, T
JMAX
= 125
°
C,
θ
JA
=
25
°
C/W:
P
C
°
C
C W
/
W
P
W
V
A
V
A
W
I
W
V
A
DISS
=
°
°
=
=
=
=
=
125
75
25
2
3
2
– .
1 0 8
1 7
12
2
1
1 7
.
0 141
.
3
–
–2 5
–3 3
.
Note that decreasing
θ
JA
increases the power output
capability. The power output capability of the individual
channels can be calculated from the following:
Channel 1 Output Power (P1) = V1 I
1
Channel 2 Output Power (P2) = V2 I
2
Channel 3 Output Power (P3) = V3 I
3
Total Output Power (P123) = P
DISS
/
η
= P1 + P2 + P3
Figure 9 shows power output capability if overall system
efficiency (
η
) is 75% and maximum allowable power
dissipation (P
DISS
) is either 1W or 2W. For example, if
allowable power dissipation is 2W, Channel 3 output
power is 2W and Channel 2 output power is 1W, then
Channel 1 output power can be up to 5W.
RELATED LINEAR TECHNOLOGY PUBLICATIONS
Application notes 19, 35, 44, 76 and 88 contain more
detailed descriptions and design information for buck
regulators and other switching regulators. The LT1375
data sheet has a more extensive discussion of output
ripple, loop compensation, and stability testing. Design
Notes 100 and 318 show how to generate a dual polarity
output supply using a buck regulator.
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