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參數(shù)資料
| 型號(hào)： | LT1336IS |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | MOSFETs |
| 英文描述： | Octal D-Type Edge-Triggered Flip-Flops With 3-State Outputs 20-SO 0 to 70 |
| 中文描述： | 1.5 A HALF BRDG BASED MOSFET DRIVER, PDSO16 |
| 封裝： | 0.150 INCH, PLASTIC, SO-16 |
| 文件頁(yè)數(shù)： | 13/16頁(yè) |
| 文件大?。?/td> | 365K |
| 代理商： | LT1336IS |
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13
LT1336
APPLICATIO
S I
FOR
ATIO
U
W
U
U
Figure 4. Adding Synchronous Switching to a Step-Down Switching Regulator
negative inductor current is returned to HV when the
switch turns back on. However, I
2
R losses will occur
under these conditions due to the recirculating currents.
The LT1336 performs the synchronous MOSFET drive in
a step-down switching regulator. A reference and PWM
are required to complete the regulator. Any voltage mode
or current mode PWM controller may be used but the
LT3526 is particularly well-suited to high power, high
efficiency applications such as the 10A circuit shown in
Figure 6. In higher current regulators a small Schottky
diode across the bottom MOSFET helps to reduce reverse-
recovery switching losses.
Motor Drive Applications
In applications where rotation is always in the same
direction, a single LT1336 controlling a half-bridge can be
used to drive a DC motor. One end of the motor may be
connected either to supply or to ground. A motor in this
configuration is controlled by its inputs which give three
alternatives: run, free running stop (coasting) and fast
stop (“plugging” braking with the motor shorted by one of
the MOSFETs).
Whenever possible, returning one end of the motor to
ground is preferable. When the motor is returned to supply
and the boost topology is used to charge the bootstrap
capacitor, the return current from the top driver will find its
way to the high voltage rail through the top MOSFET. Since
+
+
INTOP
INBOTTOM
TGATEDR
TGATEFB
TSOURCE
BGATEDR
BGATEFB
LT1336
HV
V
OUT
R
GS
R
SENSE
1336 F04
REF PWM
OUT A
OUT A
Switch
TotalPeriod
Switch
TotalPeriod
On=
V
HV
HV – V
Off =
HV
OUT
OUT
(
)
(
)
Note that for HV > 2V
OUT
, the switch is off longer than it is
on, making the diode losses more significant than the
switch. The worst case for the diode is during a short
circuit, when V
OUT
approaches zero and the diode con-
ducts the short-circuit current almost continuously.
Figure 4 shows the LT1336 used to synchronously drive a
pair of power MOSFETs in a step-down regulator applica-
tion, where the top MOSFET is the switch and the bottom
MOSFET replaces the Schottky diode. Since both conduc-
tion paths have low losses, this approach can result in very
high efficiency (90% to 95%) in most applications. For
regulators under 10A, using low R
DS(ON)
N-channel
MOSFETs eliminates the need for heat sinks. R
GS
holds the
top MOSFET off when HV is applied before the 12V supply.
One fundamental difference in the operation of a step-
down regulator with synchronous switching is that it never
becomes discontinuous at light loads. The inductor cur-
rent doesn’t stop ramping down when it reaches zero, but
actually reverses polarity, resulting in a constant ripple
current independent of load. This does not cause a signifi-
cant efficiency loss (as might be expected) since the
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LT1339C | Octal Buffers/Drivers With 3-State Outputs 20-SOIC 0 to 70 |
| LT1339 | High Efficiency, Synchronous, 4-Switch Buck-Boost Controller |
| LT1339CN | Octal Buffers/Drivers With 3-State Outputs 20-SOIC 0 to 70 |
| LT1339CSW | Octal Buffers/Drivers With 3-State Outputs 20-SOIC 0 to 70 |
| LT1339I | Octal Buffers/Drivers With 3-State Outputs 20-SOIC 0 to 70 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT1336IS#PBF | 功能描述:IC PWR MOSFET DVR N-CH 16-SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - MOSFET，電橋驅(qū)動(dòng)器 - 外部開(kāi)關(guān) 系列:- 標(biāo)準(zhǔn)包裝:5 系列:- 配置:低端 輸入類型:非反相 延遲時(shí)間:600ns 電流 - 峰:12A 配置數(shù):1 輸出數(shù):1 高端電壓 - 最大（自引導(dǎo)啟動(dòng)）:- 電源電壓:14.2 V ~ 15.8 V 工作溫度:-20°C ~ 60°C 安裝類型:通孔 封裝/外殼:21-SIP 模塊 供應(yīng)商設(shè)備封裝:模塊 包裝:散裝 配用:BG2A-NF-ND - KIT DEV BOARD FOR IGBT 其它名稱:835-1063 |
| LT1336IS#TR | 功能描述:IC DRVR MOSF 1/2BRDG N-CH 16SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - MOSFET，電橋驅(qū)動(dòng)器 - 外部開(kāi)關(guān) 系列:- 標(biāo)準(zhǔn)包裝:5 系列:- 配置:低端 輸入類型:非反相 延遲時(shí)間:600ns 電流 - 峰:12A 配置數(shù):1 輸出數(shù):1 高端電壓 - 最大（自引導(dǎo)啟動(dòng)）:- 電源電壓:14.2 V ~ 15.8 V 工作溫度:-20°C ~ 60°C 安裝類型:通孔 封裝/外殼:21-SIP 模塊 供應(yīng)商設(shè)備封裝:模塊 包裝:散裝 配用:BG2A-NF-ND - KIT DEV BOARD FOR IGBT 其它名稱:835-1063 |
| LT1336IS#TRPBF | 功能描述:IC PWR MOSFET DVR N-CH 16-SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - MOSFET，電橋驅(qū)動(dòng)器 - 外部開(kāi)關(guān) 系列:- 標(biāo)準(zhǔn)包裝:5 系列:- 配置:低端 輸入類型:非反相 延遲時(shí)間:600ns 電流 - 峰:12A 配置數(shù):1 輸出數(shù):1 高端電壓 - 最大（自引導(dǎo)啟動(dòng)）:- 電源電壓:14.2 V ~ 15.8 V 工作溫度:-20°C ~ 60°C 安裝類型:通孔 封裝/外殼:21-SIP 模塊 供應(yīng)商設(shè)備封裝:模塊 包裝:散裝 配用:BG2A-NF-ND - KIT DEV BOARD FOR IGBT 其它名稱:835-1063 |
| LT1339 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:High Voltage, Current Mode Switching Regulator Controller |
| LT1339C | 制造商:LINER 制造商全稱:Linear Technology 功能描述:High Power Synchronous DC/DC Controller |
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