- 您現(xiàn)在的位置：買賣IC網 > PDF目錄384527 > ISL6614A (Intersil Corporation) Dual Advanced Synchronous Rectified Buck MOSFET Drivers with Pre-POR OVP(帶Pre-POR過壓保護的雙高級同步整流降壓MOSFET驅動器) PDF資料下載
參數資料
| 型號： | ISL6614A |
| 廠商： | Intersil Corporation |
| 英文描述： | Dual Advanced Synchronous Rectified Buck MOSFET Drivers with Pre-POR OVP(帶Pre-POR過壓保護的雙高級同步整流降壓MOSFET驅動器) |
| 中文描述： | 雙高級同步整流降壓MOSFET驅動器與前葡萄牙過壓保護（帶前葡萄牙過壓保護的雙高級同步整流降壓MOSFET的驅動器） |
| 文件頁數： | 8/12頁 |
| 文件大小： | 328K |
| 代理商： | ISL6614A |
8
FN9160.3
January 3, 2006
Description
Operation
Designed for versatility and speed, the ISL6614A MOSFET
driver controls both high-side and low-side N-Channel FETs of
two half-bridge power trains from two externally provided PWM
signals.
Prior to VCC exceeding its POR level, the Pre-POR
overvoltage protection function is activated during initial startup;
the upper gate (UGATE) is held low and the lower gate
(LGATE), controlled by the Pre-POR overvoltage protection
circuits, is connected to the PHASE. Once the VCC voltage
surpasses the VCC Rising Threshold (See Electrical
Specifications), the PWM signal takes control of gate
transitions. A rising edge on PWM initiates the turn-off of the
lower MOSFET (see Timing Diagram). After a short
propagation delay [t
PDLL
], the lower gate begins to fall. Typical
fall times [t
FL
] are provided in the Electrical Specifications
section. Adaptive shoot-through circuitry monitors the PHASE
voltage and determines the upper gate delay time [t
PDHU
]. This
prevents both the lower and upper MOSFETs from conducting
simultaneously. Once this delay period is complete, the upper
gate drive begins to rise [t
RU
] and the upper MOSFET turns on.
A falling transition on PWM results in the turn-off of the upper
MOSFET and the turn-on of the lower MOSFET. A short
propagation delay [t
PDLU
] is encountered before the upper
gate begins to fall [t
FU
]. Again, the adaptive shoot-through
circuitry determines the lower gate delay time, t
PDHL
. The
PHASE voltage and the UGATE voltage are monitored, and
the lower gate is allowed to rise after PHASE drops below a
level or the voltage of UGATE to PHASE reaches a level
depending upon the current direction (See next section for
details). The lower gate then rises [t
RL
], turning on the lower
MOSFET.
Advanced Adaptive Zero Shoot-Through Deadtime
Control (Patent Pending)
These drivers incorporate a unique adaptive deadtime control
technique to minimize deadtime, resulting in high efficiency
from the reduced freewheeling time of the lower MOSFETs’
body-diode conduction, and to prevent the upper and lower
MOSFETs from conducting simultaneously. This is
accomplished by ensuring either rising gate turns on its
MOSFET with minimum and sufficient delay after the other has
turned off.
During turn-off of the lower MOSFET, the PHASE voltage is
monitored until it reaches a -0.2V/+0.8V trip point for a
forward/reverse current, at which time the UGATE is released
to rise. An auto-zero comparator is used to correct the r
DS(ON)
drop in the phase voltage preventing from false detection of the
-0.2V phase level during r
DS(ON)
conduction period. In the
case of zero current, the UGATE is released after 35ns delay of
the LGATE dropping below 0.5V. During the phase detection,
the disturbance of LGATE’s falling transition on the PHASE
node is blanked out to prevent falsely tripping. Once the
PHASE is high, the advanced adaptive shoot-through circuitry
monitors the PHASE and UGATE voltages during a PWM
falling edge and the subsequent UGATE turn-off. If either the
UGATE falls to less than 1.75V above the PHASE or the
PHASE falls to less than +0.8V, the LGATE is released to turn
on.
Three-State PWM Input
A unique feature of these drivers and other Intersil drivers is
the addition of a shutdown window to the PWM input. If the
PWM signal enters and remains within the shutdown window
for a set holdoff time, the driver outputs are disabled and
both MOSFET gates are pulled and held low. The shutdown
state is removed when the PWM signal moves outside the
shutdown window. Otherwise, the PWM rising and falling
PWM
UGATE
LGATE
t
FL
t
PDHU
t
PDLL
t
RL
t
TSSHD
t
PDTS
t
PDTS
1.5V<PWM<3.2V
1.0V<PWM<2.6V
t
FU
t
RU
t
PDLU
t
PDHL
t
TSSHD
FIGURE 1. TIMING DIAGRAM
ISL6614A
相關PDF資料 |
PDF描述 |
|---|---|
| ISL6740A | Flexible Double-Ended Voltage-Mode PWM Controller with Voltage Feed Forward |
| ISL6740AIVZA | JT 5C 5#20 PIN PLUG |
| ISL6740AIVZA-T | Flexible Double-Ended Voltage-Mode PWM Controller with Voltage Feed Forward |
| ISL6742 | Octal Buffers/Drivers With 3-State Outputs 20-SSOP -40 to 85 |
| ISL6742AAZA-T | Advanced Double-Ended PWM Controller |
相關代理商/技術參數 |
參數描述 |
|---|---|
| ISL6614ACB | 功能描述:IC DRIVER MOSF DUAL SYNC 14SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - MOSFET，電橋驅動器 - 外部開關 系列:- 標準包裝:50 系列:- 配置:低端 輸入類型:非反相 延遲時間:40ns 電流 - 峰:9A 配置數:1 輸出數:1 高端電壓 - 最大（自引導啟動）:- 電源電壓:4.5 V ~ 35 V 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:TO-263-6，D²Pak（5 引線+接片），TO-263BA 供應商設備封裝:TO-263 包裝:管件 |
| ISL6614ACB-T | 功能描述:IC DRIVER DUAL SYNC BUCK 14-SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - MOSFET，電橋驅動器 - 外部開關 系列:- 標準包裝:50 系列:- 配置:低端 輸入類型:非反相 延遲時間:40ns 電流 - 峰:9A 配置數:1 輸出數:1 高端電壓 - 最大（自引導啟動）:- 電源電壓:4.5 V ~ 35 V 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:TO-263-6，D²Pak（5 引線+接片），TO-263BA 供應商設備封裝:TO-263 包裝:管件 |
| ISL6614ACBZ | 功能描述:IC DRIVER MOSF DUAL SYNC 14SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - MOSFET，電橋驅動器 - 外部開關 系列:- 標準包裝:50 系列:- 配置:高端 輸入類型:非反相 延遲時間:200ns 電流 - 峰:250mA 配置數:1 輸出數:1 高端電壓 - 最大（自引導啟動）:600V 電源電壓:12 V ~ 20 V 工作溫度:-40°C ~ 125°C 安裝類型:通孔 封裝/外殼:8-DIP（0.300"，7.62mm） 供應商設備封裝:8-DIP 包裝:管件 其它名稱:*IR2127 |
| ISL6614ACBZA | 功能描述:IC DRIVER DUAL SYNC BUCK 14-SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - MOSFET，電橋驅動器 - 外部開關 系列:- 標準包裝:50 系列:- 配置:高端 輸入類型:非反相 延遲時間:200ns 電流 - 峰:250mA 配置數:1 輸出數:1 高端電壓 - 最大（自引導啟動）:600V 電源電壓:12 V ~ 20 V 工作溫度:-40°C ~ 125°C 安裝類型:通孔 封裝/外殼:8-DIP（0.300"，7.62mm） 供應商設備封裝:8-DIP 包裝:管件 其它名稱:*IR2127 |
| ISL6614ACBZA-T | 功能描述:IC DRIVER DUAL SYNC BUCK 14-SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - MOSFET，電橋驅動器 - 外部開關 系列:- 標準包裝:50 系列:- 配置:高端 輸入類型:非反相 延遲時間:200ns 電流 - 峰:250mA 配置數:1 輸出數:1 高端電壓 - 最大（自引導啟動）:600V 電源電壓:12 V ~ 20 V 工作溫度:-40°C ~ 125°C 安裝類型:通孔 封裝/外殼:8-DIP（0.300"，7.62mm） 供應商設備封裝:8-DIP 包裝:管件 其它名稱:*IR2127 |
發(fā)布緊急采購，3分鐘左右您將得到回復。