參數(shù)資料
型號(hào)： HA17384
廠商： Hitachi,Ltd.
英文描述： 250000 SYSTEM GATE 1.5 VOLT FPGA
中文描述： 高速開(kāi)關(guān)電源電流模式PWM控制IC
文件頁(yè)數(shù)： 27/31頁(yè)
文件大?。?/td> 145K
代理商： HA17384
HA17384SPS/SRP, HA17384HPS/HRP, HA17385HPS/HRP
27
2. OVP latch output overvoltage protection (the HA17384H and HA17385H only)
The OVP latch is incorporated in the error amp input pin (FB). If the FB pin is pulled up to 7.0 V typ.
just once when the power supply enters any kind of error state, IC operation can be halted and held as it
is (latched). To reset the latch, drop the IC’s supply voltage to 7.0 V typ. or below momentarily.
An OVP latch application example is shown in figure 15.
+EA
V
IN
R
2
47k
2
2.5V
Inside IC
OVP comparator
FB
Error amplifier
+OVP
7.0V
COMP
1
R
1
10k
HA17431
(Vref
≈
2.5V)
1k
2SA1029
R
10k
External circuit
(only partially shown)
Figure 15 Example of OVP Latch Application Circuit
This circuit protects the system by causing latch operation in the event of an overload or load short. In
the steady state, the error amp input/output pins operate at 2.5 V typ., but if the load becomes heavy the
FB pin level drops and the COMP pin level rises. As shown in the figure, this is detected by the
HA17431 shunt regulator, and the FB pin level is pulled up, operating the OVP latch.
The operation parameters are as follows:
COMP pin voltage detection level: Vth = (R
1
+ R
2
) / R
2
×
2.5 V
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
HA17384FP 制造商:HITACHI 制造商全稱(chēng):Hitachi Semiconductor 功能描述:CURRENT MODE PWM CONTROL SWITTCHING REGULATOR ICS
HA17384HPS 制造商:HITACHI 制造商全稱(chēng):Hitachi Semiconductor 功能描述:High Speed Current Mode PWM Control IC for Switching Power Supply
HA17384HPS/HRP 制造商:HITACHI 制造商全稱(chēng):Hitachi Semiconductor 功能描述:High Speed Current Mode PWM Control IC for Switching Power Supply
HA17384HRP 制造商:RENESAS 制造商全稱(chēng):Renesas Technology Corp 功能描述:High Speed Current Mode PWM Control IC for Switching Power Supply
HA17384PS 制造商:HITACHI 制造商全稱(chēng):Hitachi Semiconductor 功能描述:CURRENT MODE PWM CONTROL SWITTCHING REGULATOR ICS
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