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參數(shù)資料
| 型號： | HA17384SPS |
| 廠商： | Hitachi,Ltd. |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | High Speed Current Mode PWM Control IC for Switching Power Supply(開關(guān)電源的高速電流模式PWM控制芯片) |
| 中文描述： | 高速開關(guān)電源電流模式PWM控制IC（開關(guān)電源的高速電流模式的PWM控制芯片） |
| 文件頁數(shù)： | 27/31頁 |
| 文件大?。?/td> | 145K |
| 代理商： | HA17384SPS |
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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
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| HA17385HRP | High Speed Current Mode PWM Control IC for Switching Power Supply(開關(guān)電源的高速電流模式PWM控制芯片) |
| HA17384HRP | High Speed Current Mode PWM Control IC for Switching Power Supply |
| HA17384SRP | High Speed Current Mode PWM Control IC for Switching Power Supply |
| HA17385HPS | High Speed Current Mode PWM Control IC for Switching Power Supply |
| HA17384 | 250000 SYSTEM GATE 1.5 VOLT FPGA |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HA17384SPS-E | 制造商:Renesas Electronics 功能描述:Current Mode PWM Controller 1A 8-Pin PDIP Bulk |
| HA17384SRP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:High Speed Current Mode PWM Control IC for Switching Power Supply |
| HA17385BPS | 制造商:Hitachi 功能描述:1 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDIP8 |
| HA17385FP | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:CURRENT MODE PWM CONTROL SWITTCHING REGULATOR ICS |
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