参数资料
| 型号： | FDMF8704 |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 4/11页 |
| 文件大小： | 0K |
| 描述： | IC MODULE DRIVER/FET 56MLP 8X8 |
| 标准包装： | 1 |
| 类型： | 高端/低端驱动器 |
| 输入类型： | PWM |
| 输出数： | 1 |
| 电流 - 输出 / 通道： | 32A |
| 电流 - 峰值输出： | 65A |
| 电源电压： | 4.5 V ~ 5.5 V |
| 工作温度： | -55°C ~ 150°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 56-MLP |
| 供应商设备封装： | 56-MLP（8x8） |
| 包装： | 标准包装 |
| 产品目录页面： | 1216 (CN2011-ZH PDF) |
| 其它名称： | FDMF8704DKR |
Functional Block Diagram
HSEN
BOOT
HDRV
VIN
VCIN
Q1
DISB
PWM
VSWH
Q2
VCIN
Functional Description
CGND
Figure 3. Functional Block Diagram
LDRV
PGND
The FDMF8704 is a driver plus FET module optimized for
synchronous buck converter topology. A single PWM input
signal is all that is required to properly drive the high-side and
the low-side MOSFETs. Each part is capable of driving speeds
up to 1MHz.
Low-Side Driver
The low-side driver (LDRV) is designed to drive a ground
referenced low R DS(ON) N-channel MOSFET. The bias for LDRV
is internally connected between VCIN and CGND. When the
driver is enabled, the driver's output is 180° out of phase with
the PWM input. When the driver is disabled (DISB = 0V), LDRV
is held low.
High-Side Driver
The high-side driver (HDRV) is designed to drive a floating
N-channel MOSFET. The bias voltage for the high-side driver is
developed by a bootstrap supply circuit, consisting of the
external diode and external bootstrap capacitor (C BOOT ). During
start-up, VSWH is held at PGND, allowing C BOOT to charge to
VCIN through the internal diode. When the PWM input goes
high, HDRV will begin to charge the high-side MOSFET's gate
(Q1). During this transition, charge is removed from C BOOT and
delivered to Q1's gate. As Q1 turns on, VSWH rises to V IN ,
forcing the BOOT pin to V IN +V C(BOOT) , which provides
sufficient VGS enhancement for Q1. To complete the switching
cycle, Q1 is turned off by pulling HDRV to VSWH. C BOOT is then
recharged to VCIN when VSWH falls to PGND. HDRV output is
in phase with the PWM input. When the driver is disabled, the
high-side gate is held low.
Adaptive Gate Drive Circuit
The driver IC embodies an advanced design that ensures
minimum MOSFET dead-time while eliminating potential shoot-
through (cross-conduction) currents. It senses the state of the
MOSFETs and adjusts the gate drive, adaptively, to ensure they
do not conduct simultaneously. Refer to Figure 4 and 5 for the
relevant timing waveforms. To prevent overlap during the low-
to-high switching transition (Q2 OFF to Q1 ON), the adaptive
circuitry monitors the voltage at the LDRV pin. When the PWM
signal goes HIGH, Q2 will begin to turn OFF after some
propagation delay (t PDL(LDRV) ). Once the LDRV pin is
discharged below ~1.2V, Q1 begins to turn ON after adaptive
delay t PDH(HDRV) . To preclude overlap during the high-to-low
transition (Q1 OFF to Q2 ON), the adaptive circuitry monitors
the voltage at the SW pin. When the PWM signal goes LOW, Q1
will begin to turn OFF after some propagation delay
(t PDL(HDRV) ). Once the VSWH pin falls below ~2.2V, Q2 begins
to turn ON after adaptive delay t PDH(LDRV) . Additionally, V GS of
Q1 is monitored. When V GS(Q1) is discharged below ~1.2V, a
secondary adaptive delay is initiated, which results in Q2 being
driven ON after t PDH(LDRV) , regardless of SW state. This
function is implemented to ensure C BOOT is recharged each
switching cycle, particularly for cases where the power
converter is sinking current and SW voltage does not fall below
the 2.2V adaptive threshold. Secondary delay t PDH(HDRV) is
longer than t PDH(LDRV) .
FDMF8704 Rev. G
4
www.fairchildsemi.com
相关PDF资料 |
PDF描述 |
|---|---|
| FDY6342L | IC LOAD SWITCH 8V -0.83A SC89-6 |
| FL7930CM | IC PFC CTLR FLYBACK/BOUND 8SOICN |
| FOD060L | OPTOCOUPLER LOGIC 3.3V 8-SOIC |
| FOD0721 | IC OPTOCOUPLER 25MBIT 8-SOP |
| FOD2200SDV | OPTOCOUPLER 3STATE OUTPUT 8-SMD |
相关代理商/技术参数 |
参数描述 |
|---|---|
| FDMF8704V | 功能描述:功率驱动器IC Driver plus FET w/5v reg RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
| FDMF8705 | 功能描述:功率驱动器IC MLP 8X8 DRIVER PLUS FET MULTI-CHIP MODU RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
| FDMH000C11L-YW | 制造商:Thomas & Betts 功能描述:HAZ3FLD,1000W,M.H.,5 TAP BALST |
| FDMHP17C070-YWE | 制造商:Thomas & Betts 功能描述:HZ FDMHP17C070YWE HAZ3,FLD,175W,M.H |
| FDMJ1023PZ | 功能描述:MOSFET -20V Dual P-Channel PowerTrench RoHS:否 制造商:STMicroelectronics 晶体管极性:N-Channel 汲极/源极击穿电压:650 V 闸/源击穿电压:25 V 漏极连续电流:130 A 电阻汲极/源极 RDS（导通）:0.014 Ohms 配置:Single 最大工作温度: 安装风格:Through Hole 封装 / 箱体:Max247 封装:Tube |
发布紧急采购，3分钟左右您将得到回复。