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參數(shù)資料
| 型號： | LT1312 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | PCMCIA Driver/Regulator(PCMCIA（個人計算機存儲卡國際協(xié)會）驅(qū)動器/穩(wěn)壓器) |
| 中文描述： | PCMCIA驅(qū)動程序/穩(wěn)壓器（使用PCMCIA（個人計算機存儲卡國際協(xié)會）驅(qū)動器/穩(wěn)壓器） |
| 文件頁數(shù)： | 7/12頁 |
| 文件大小： | 223K |
| 代理商： | LT1312 |
7
LT1312
APPLICATIO
S I
N
FOR
ATIO
U
W
U
D1
MBRS140
D3
MBRS130T3
D2
MBRS140
Q3
VN7002
V
6.5V TO 18V
C4
1000pF
C2
1000pF
C3
220μF
C1
68μF
C5
22μF
1μF
5V
OUTPUT
Q1
10
9
20
15
14
EN0
EN1
VALID
*LPE-6562-A026 DALE (605) 665-9301
14V AUXILIARY SUPPLY
T1
1.8T
30μH*
Q2
R4
22
R1
100
R3
18k
R2
100
R5
0.033
LT1312 F1
+
+
+
V
S
EN0
TO CARD VPP PIN
0V, 3.3V, 5V, 12V OR HI-Z
FROM
CARD V
CC
PIN
VPP
OUT
LT1312
EN1
VALID
SENSE
GND
+
V
IN
PDRIVE
NDRIVE
SENSE
+
SENSE
–
1/2 LTC1142HV
5V REG
loaded without regard to the loading on the 5V output of
the LTC1142HV.
Continuous mode operation is only invoked when the
LT1312 is programmed to 12V. If the LT1312 is pro-
grammed to 0V, 3.3V or 5V, power is obtained directly
from the main power source (battery pack) through diode
D1. Again, the LT1312 output can be loaded without
regard to the loading of the main 5V output.
R4 and C4 absorb transient voltage spikes associated with
the leakage inductance inherent in T1's secondary winding
and ensure that the auxiliary supply does not exceed 20V.
Figure 2 is a graph of output voltage versus output current
for the auxiliary 14V supply shown in Figure 1. Note that
the auxiliary supply voltage is slightly higher when the 5V
output is heavily loaded. This is due to the increased
energy flowing through the main 5V inductor.
LTC1142 Auxiliary Power from the 3.3V Output
The circuit of Figure 1 can be modified for operation with
low-battery count applications (6 cell). As the input volt-
age falls, the 5V duty cycle increases to the point where
there is simply not enough time to transfer energy from the
5V primary to the auxiliary winding. For applications
where heavy 12V load currents exist in conjunction with
low input voltages (<6.5V), the auxiliary winding can be
derived from the 3.3V section instead of the 5V section of
the LTC1142. In this case, a transformer with a turns ratio
of 1:3.4 to 1:3.6 should be used in place of the 3.3V section
AUXILIARY OUTPUT CURRENT (mA)
0.1
11
A
15
16
17
10
1
100
1000
LT1312 F2
14
13
12
V
IN
= 8V
EN0 = HI
I
OUT5V
= 1A
I
OUT5V
= 0mA
Figure 2. LTC1142 Auxiliary Supply Voltage
Figure 1. Deriving 14V Power from an Auxiliary Winding on the LTC1142HV 5V Regulator
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| LT1313CS#PBF | 功能描述:IC DRV/REG PCMCIA VPP DL 16SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,000 系列:- 應用:電源，ICERA E400，E450 輸入電壓:4.1 V ~ 5.5 V 輸出數(shù):10 輸出電壓:可編程 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:42-WFBGA，WLCSP 供應商設備封裝:42-WLP 包裝:帶卷 (TR) |
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