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參數資料
| 型號： | LT1950 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Single Switch PWM Controller with Auxiliary Boost Converter |
| 中文描述： | 單開關PWM控制器，帶有輔助升壓轉換器 |
| 文件頁數： | 10/20頁 |
| 文件大?。?/td> | 285K |
| 代理商： | LT1950 |
LT1950
10
sn1950 1950fs
APPLICATIU
W
U
U
LT1950 Input Supplies, V
REF
Output and GATE Enable
V
IN
is the main input supply for the LT1950. V
IN2
is the
input supply for the LT1950 output driver. V
IN2
can be
provided by shorting the V
IN2
pin to the V
IN
pin or by
generating V
IN2
using the BOOST pin. Waveforms of V
IN
,
V
IN2
, V
REF
and GATE switching are shown in Figures 2 and
3. Figure 2 represents low V
IN
operation with V
IN2
gener-
ated using the B00ST pin. Figure 3 represents V
IN
= V
IN2
operation with the BOOST pin open circuit or shorted to
ground.
Low V
IN
Operation
The LT1950 can be configured to provide a minimum of
10V GATE drive for an external N-channel MOSFET from
V
IN
voltages as low as 3V, if the BOOST pin is used to
generate a second supply at the V
IN2
pin (see Figure 2 and
Applications Information “ Generating V
IN2
Supply Using
BOOST
Pin”). The advantage of this configuration is that a
lower R
DS(ON)
is achieved for the external N-channel
MOSFET, improving efficiency, versus a controller run-
ning at 3V input without boosted gate drive. In addition,
typical controllers running at low input voltages have the
limitation of only being able to use logic level MOSFETs.
The LT1950 allows a greater range of usable MOSFETs.
This versatility allows optimization of the overall power
supply performance and allows applications which would
otherwise not be possible without a more complex topol-
ogy. Figure 2 shows that for V
IN
above 2V, the internal
switcher at the BOOST pin is enabled. This switch gener-
ates the V
IN2
supply. As V
IN2
ramps up above the
undervoltage lockout threshold of 6.8V the 2.5V reference
V
REF
becomes active and powers up internal control
circuitry. When V
IN2
exceeds approximately 8V, the gate
driver is enabled. V
IN2
is regulated between 10V and 11V,
providing a supply to the LT1950 output driver to ensure
a minimum of 10V drive at the GATE pin.
Figure 2. Low V
IN
Operation
Figure 3. V
IN
= V
IN2
Operation
12
8
4
0
V
IN
50
μ
s/DIV
BOOST
LT1950
V
IN2
V
IN
L1
D1
C1
MIN
3V
4
3
2
1
0
V
REF
1950 F02
GATE
V
IN2
10.2
8.5
6.8
5.1
3.4
5.0
2.5
0
10
5
0
V
IN
= V
IN2
V
REF
GATE
10
μ
s/DIV
BOOST
LT1950
V
IN2
V
IN
TYPICAL START-UP INPUT
>8.2V
C1
*
*BOOST PIN CAN BE
LEFT OPEN OR
SHORTED TO GROUND
1950 F03
V
IN
= V
IN2
Operation
If low V
IN
operation is not required below approximately
8V on V
IN
the LT1950 can be configured to run without the
use of the BOOST pin by shorting the V
IN2
pin to the V
IN
pin. Figure 3 shows that both V
IN
and V
IN2
must now
exceed 6.8V to activate the 2.5V V
REF
output and must
exceed approximately 8V to enable the output driver
(GATE pin).
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LT1950EGN | 功能描述:IC REG CTRLR PWM CM 16-SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標準包裝:2,500 系列:- PWM 型:電流模式 輸出數:1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無 升壓:是 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤 包裝:帶卷 (TR) |
| LT1950EGN#PBF | 功能描述:IC REG CTRLR PWM CM 16-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標準包裝:2,500 系列:- PWM 型:電流模式 輸出數:1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無 升壓:是 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤 包裝:帶卷 (TR) |
| LT1950EGN#TR | 功能描述:IC REG CTRLR PWM CM 16-SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標準包裝:2,500 系列:- PWM 型:電流模式 輸出數:1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無 升壓:是 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤 包裝:帶卷 (TR) |
| LT1950EGN#TRPBF | 功能描述:IC REG CTRLR PWM CM 16-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標準包裝:2,500 系列:- PWM 型:電流模式 輸出數:1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無 升壓:是 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤 包裝:帶卷 (TR) |
| LT1950IGN | 功能描述:IC REG CTRLR PWM CM 16-SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標準包裝:2,500 系列:- PWM 型:電流模式 輸出數:1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無 升壓:是 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤 包裝:帶卷 (TR) |
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