参数资料
型号: IR3640MPBF
厂商: International Rectifier
文件页数: 13/32页
文件大小: 0K
描述: IC REG CTRLR BUCK PWM VM 20-MLPQ
标准包装: 100
PWM 型: 电压模式
输出数: 1
频率 - 最大: 1.65MHz
占空比: 92%
电源电压: 4.5 V ~ 5.5 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -40°C ~ 125°C
封装/外壳: 20-VFQFN 裸露焊盘
包装: 管件
IR3640MPBF
Thermal Shutdown
Temperature sensing is provided inside IR3640.
The trip threshold is typically set to 140 o C. When
trip threshold is exceeded, thermal shutdown
turns off both MOSFETs and discharges the soft
start capacitor. Automatic restart is initiated when
the sensed temperature drops within the
operating range. There is a 20 o C hysteresis in
the thermal shutdown threshold .
Power Good and Over-voltage Protection
The IC continually monitors the output voltage via
sense pin. The Vsns voltage compares to a fixed
voltage. As soon as the sensed voltage reaches
0.88*Vref, the Power Good signal flags. Power
Good pin needs to be externally pulled high. High
state indicates that output is in regulation. Figure
10a and 10b shows the timing diagrams of Power
Good function.
Fig.10b: IR3640 Sequencing
If the output voltage exceeds the over voltage
Power Up
threshold, an over voltage trip signal asserts, this
will result to turn off the high side driver and turn
on the low side driver until the Vsns voltage
drops below 1.15*Vref threshold. Both drivers are
latched off until a reset performed by cycling
either Vcc or Enable.
The OVP threshold can be externally
programmed to user defined value. Figure 10c
shows the response in over-voltage condition.
Fig.10c: IR3640 Timing Diagram of Over-
voltage Protection
Fig.10a: IR3640 Non-Sequencing
Power Up (Seq=Vcc)
06/15/2009
13
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