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參數(shù)資料
| 型號(hào)： | LT1103CY |
| 英文描述： | Current-Mode SMPS Controller |
| 中文描述： | 電流模式開關(guān)電源控制器 |
| 文件頁(yè)數(shù)： | 10/16頁(yè) |
| 文件大小： | 206K |
| 代理商： | LT1103CY |
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10
LT1107
1107fa
V
OUT
should be less than 6.2V. More negative output
voltages can be accommodated as in the prior section.
In Figure 4, the input is negative while the output is
positive. In this configuration, the magnitude of the input
voltage can be higher or lower than the output voltage. A
level shift, provided by the PNP transistor, supplies proper
polarity feedback information to the regulator.
Figure 4. Negative-to-Positive Converter
Using the I
LIM
Pin
The LT1107 switch can be programmed to turn off at a set
switch current, a feature not found on competing devices.
This enables the input to vary over a wide range without
exceeding the maximum switch rating or saturating the
inductor. Consider the case where analysis shows the
LT1107 must operate at an 800mA peak switch current
with a 2V input. If V
IN
rises to 4V, the peak switch current
will rise to 1.6A, exceeding the maximum switch current
rating. With the proper resistor selected (see the “Maxi-
mum Switch
Current vs R
LIM
” characteristic), the switch
current will be limited to 800mA, even if the input voltage
increases.
Another situation where the I
LIM
feature is useful occurs
when the device goes into continuous mode operation.
This occurs in step-up mode when:
V
V
V
V
DC
OUT
DIODE
IN
SW
+
<
1
1
24
(
)
When the input and output voltages satisfy this relation-
ship, inductor current does not go to zero during the
switch OFF time. When the switch turns on again, the
current ramp starts from the non-zero current level in the
inductor just prior to switch turn-on. As shown in Figure
5, the inductor current increases to a high level before the
comparator turns off the oscillator. This high current can
cause excessive output ripple and requires oversizing the
output capacitor and inductor. With the I
LIM
feature, the
switch turns off at the programmed current as shown in
Figure 6, keeping output ripple to a minimum.
D1
L1
I
LIM
V
IN
FB
SW2
GND
C1
LT1107
1107 F04
+V
OUT
–V
IN
R2
SW1
C2
2N3906
R1
V
OUT
= R1
( )
R3
+
+
D1
1N5818
L1
R3
I
LIM
V
IN
FB
SW2
GND
C1
LT1107
1107 F03
+V
IN
–V
OUT
R1
R2
SW1
C2
+
+
Figure 3. Positive-to-Negative Converter
U
S
A
O
PPLICATI
U
U
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LT1105CS | Current-Mode SMPS Controller |
| LT1117IST-2.85 | THREE-TERMINAL POSITIVE FIXED VOLTAGE REGULATORS |
| LT1117IST-3.3 | THREE-TERMINAL POSITIVE FIXED VOLTAGE REGULATORS |
| LT1117IST-5 | THREE-TERMINAL POSITIVE FIXED VOLTAGE REGULATORS |
| LT1118CST8-2.5 | Analog IC |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT1105 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Offline Switching Regulator |
| LT1105C | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Offline Switching Regulator |
| LT1105CN | 功能描述:IC OFFLINE SWIT CM HV 14DIP RoHS:否 類別:集成電路 (IC) >> PMIC - AC-DC 轉(zhuǎn)換器，離線開關(guān) 系列:- 標(biāo)準(zhǔn)包裝:3,000 系列:- 輸出隔離:隔離 頻率范圍:61kHz ~ 71kHz 輸入電壓:9.4 V ~ 28 V 輸出電壓:12V 功率（瓦特）:- 工作溫度:-40°C ~ 125°C 封裝/外殼:SC-74，SOT-457 供應(yīng)商設(shè)備封裝:6-TSOP 包裝:帶卷 (TR) |
| LT1105CN#PBF | 制造商:Linear Technology 功能描述:Conv DC-DC Single 30V 14-Pin PDIP N |
| LT1105CN8 | 功能描述:IC OFFLINE SWIT CM HV 8DIP RoHS:否 類別:集成電路 (IC) >> PMIC - AC-DC 轉(zhuǎn)換器，離線開關(guān) 系列:- 標(biāo)準(zhǔn)包裝:3,000 系列:- 輸出隔離:隔離 頻率范圍:61kHz ~ 71kHz 輸入電壓:9.4 V ~ 28 V 輸出電壓:12V 功率（瓦特）:- 工作溫度:-40°C ~ 125°C 封裝/外殼:SC-74，SOT-457 供應(yīng)商設(shè)備封裝:6-TSOP 包裝:帶卷 (TR) |
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