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参数资料
| 型号： | FAN7387M |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 12/14页 |
| 文件大小： | 0K |
| 描述： | IC GATE DRIVER SELF OSC HV 8SOP |
| 标准包装： | 90 |
| 类型： | 镇流器控制器 |
| 频率： | 18kHz ~ 22kHz |
| 电流 - 电源： | 800µA |
| 电流 - 输出： | 350mA |
| 电源电压： | 11 V ~ 14 V |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOP |
| 包装： | 管件 |
Functional Description
1. Under-Voltage Lockout (UVLO) Function
FAN7387 has a UVLO circuit for a low-side and high-
side block. When V DD reaches to the VDD UV +, the UVLO
circuit is released and the FAN7387 operates normally.
At UVLO condition, the FAN7387 has a low supply
current of less than 130 μA. Once UVLO is released,
FAN7387 operates normally until V DD goes below
VDD UV -, the UVLO hysteresis.
FAN7387 also has a high-side gate driver. The supply
for the high-side driver is applied between V B and V S . To
prevent malfunction at low supply voltage between V B
and V S , FAN7387 provides an additional UVLO circuit. If
V B -V S is under VBS UV +, the driver holds LOW state to
turn off the high-side switch. Once the voltage of V B -V S
is higher than VBS UVH, after V B -V S exceeds VBS UV -, the
operation of driver resumes.
2. Oscillator
The running frequency is determined by an external
timing resistor (R T ) and timing capacitor (C T ). The
charge time of capacitor C T from 1/4 V DD to V DD
determines the running frequency of LO and HO gate
driver output. Figure 30 shows connection configuration.
VDD
where, t is the discharging time of the RCT voltage and
t fix is constant value about 450 ns of IC.
3. Programming Dead-Time Control / Shutdown
A multi-function pin controls dead-time using an external
resistor (R DT ) and protects abnormal condition using an
external switch. This pin should be connected to an
external capacitor to maintain stable operation.
If the voltage of DT/SD is decreased under 1 V by an
external switch, such as the TR or MOSFET, the
FAN7387 enters shutdown mode. In this mode, the
FAN7387 doesn’t have any output signal.
Figure 32. External Shutdown Circuit
RCT
1
8
VB
CT
VDD
DT/SD
2
3
7
6
HO
VS
RT
GND
4
5
LO
Figure 30. Typical Connection Method
Figure 31 shows the typical waveforms of RCT, LO, and
HO. From the circuit analysis, the discharging time of
? V DD ? In (
R t ? C t
RCT, t, is given by Equation 1:
? t
V RCT )
(1)
Figure 33. Adjustable Dead Time
4. Gate Driver Operation
t ? 1 . 38 ? R t ? C t
(3)
f running ?
?
Equation 1 enables calculation of discharging time, t,
from V DD to 1/4 V DD by substituting V RCT(t) with 1/4 V DD.
(2)
The running frequency of IC is determined by 1/T and is
approximately given as:
1 1
T 2 ( t ? T fix )
Figure 31. Typical Waveforms of RCT,LO and HO
? 2008 Fairchild Semiconductor Corporation
FAN7387 ? 1.0.4
The FAN7387 has a two operating modes. One is the
self-oscillation mode by using external timing resistor
(R T ) and external timing capacitor (C T ) and the other is
the forced oscillation mode by external PWM signal
comes from U-com and the other devices.
Figure 33 shows operation of the IC using an external
PWM circuit with additional resistors (R1 and R2) for
internal limitation of the IC. The input signal range from
an external circuit must be within 3/5 V DD and 3/4 V DD .
The external signal produces the HO and LO output and
HO signal is in-phase with the external input signal.
Figure 34. Gate Driver Using External PWM Signal
www.fairchildsemi.com
12
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| FAN7387VN | 功能描述:功率驱动器IC Half-Bridge Gate Driver 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 |
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