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參數(shù)資料
| 型號： | HA17384 |
| 廠商： | Hitachi,Ltd. |
| 英文描述： | 250000 SYSTEM GATE 1.5 VOLT FPGA |
| 中文描述： | 高速開關(guān)電源電流模式PWM控制IC |
| 文件頁數(shù)： | 23/31頁 |
| 文件大?。?/td> | 145K |
| 代理商： | HA17384 |
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HA17384SPS/SRP, HA17384HPS/HRP, HA17385HPS/HRP
23
Triangular wave
PWM maximum
ON pulse
Dumax is the ratio of
maximum ON time of
PWM to one cycle time.
In the above case,
Dumax = 95%
Calculation of operation parameters
1. Maximum ON duty Du max (Refer to the right figure.)
Du max =
1
1 + 1.78
×
In 1 +
190
R
T
440
)
R
T
=
+ 440
1
190
0.56 (1/Du max
1)
C
T
= 1.78
×
Du max
fosc
×
R
T
ID
max
= V
THCS
fosc =
1
C
T
×
R
T
×
0.56 + In 1 +
190
R
T
440
)
}
2. Oscillation frequency fosc
From the above two equations, the following two equations are
obtained.
3. Equalization to device R
T
from Du max
e
(e = 2.71828.base of natural logarithm)
4. Equation to device C
T
from fosc and R
T
5. Operating current I
IN
I
IN
= I
Q
+ Isink
CT
×
(1
Du max) + Ciss
×
V
IN
×
fosc
providing that I
Q
= 8.4mA Typ (Supply current when oscillation in IC stops.)
Ciss is the input gate capacitance of the power MOSFET which is connected and V
IN
is
the supply voltage of the IC.
Example 1: Calculation when R
T
= 10k
and C
T
= 3300pF
fosc = 52kHz, Du max = 95%, I
IN
= 9.7mA
Example 2: Calculation for 50% of Du max and 200 kHz of fosc
R
T
= 693
, C
T
= 6360pF, I
IN
= 12.5mA
However, Ciss = 1000pF, V
IN
= 18V
Note that the actual value may differ from the calculated one because of the internal
delay in operation and input characteristics of the POWER MOS FET. Check the
value when mounting.
Additionally a small Dumax leads to a large supply current, even if the frequency is
not changed, and start up may become difficult. In such a case, the following
measure is recommended.
(1) For an AC/DC converter, a small bleeder resistance is required.
(2) The large capacitance between Vref and GND is required.
(3) Use a large Dumax with a triangular wave and raise the current limit of the
switching device to around the maximum value (1.0V Typ).
The current limit is expressed as
R
CS
Figure 11 Calculation of Operation Parameters
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| HA17393 | Dual Comparator |
| HA17903FPK | Dual Comparator |
| HA17393F | Dual Comparator |
| HA17903 | 500000 SYSTEM GATE 1.5 VOLT FPGA |
| HA17903FP | Dual Comparator |
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:Hitachi Semiconductor 功能描述:CURRENT MODE PWM CONTROL SWITTCHING REGULATOR ICS |
| HA17384HPS | 制造商:HITACHI 制造商全稱: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: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: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:Hitachi Semiconductor 功能描述:CURRENT MODE PWM CONTROL SWITTCHING REGULATOR ICS |
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