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參數(shù)資料
| 型號： | HA16121FPJ |
| 廠商： | Hitachi,Ltd. |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| 中文描述： | 抗輻射高效，5安培開關(guān)穩(wěn)壓器 |
| 文件頁數(shù)： | 8/34頁 |
| 文件大?。?/td> | 250K |
| 代理商： | HA16121FPJ |
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HA16116FP/FPJ, HA16121FP/FPJ
8
The triangle wave is a voltage waveform used as a reference in creating a PWM pulse. This block operates
according to the following principles. A constant current I
O
, determined by an external timing resistor R
T
,
is made to flow continuously to external timing capacitor C
T
. When the C
T
pin voltage exceeds the
comparator threshold voltage V
H
, the comparator output causes a switch to operate, discharging a current I
O
from C
T
. Next, when the C
T
pin voltage drops below threshold voltage V
L
, the comparator output again
causes the switch to operate, stopping the I
O
discharge. The triangle wave is generated by this repeated
operation.
Note that I
O
= 1.1 V/R
T
. Since the I
O
current mirror circuit has a very limited current producing ability, R
T
should be set to
≥
5 k
(I
O
≥
220
μ
A).
With this IC series, V
H
and V
L
of the triangle wave are fixed internally at about 1.6 V and 1.0 V by the
internal resistors R
A
, R
B
, and R
C
. The oscillator frequency can be calculated as follows.
1
t
1
+ t
2
+ t
3
f
OSC
=
t
1
=
C
T
(V
H
V
L
)
1.1 V/R
T
C
T
(V
H
V
L
)
(2
1)
×
1.1 V/R
T
C
T
R
T
(V
H
V
L
)
1.1 V
=
t
2
=
C
T
R
T
(V
H
V
L
)
1.1 V
=
= t
1
V
H
V
L
= 0.6 V
1
2t
1
+ t
3
f
OSC
≈
≈
1
1.1 C
T
R
T
+ 0.8
μ
s
[Hz]
t
1
= t
2
= 0.6
T
R
T
1.1
t
3
≈
0.8
μ
s (comparator delay time in the oscillator)
Accordingly,
Here,
Note that the value of f
OSC
may differ slightly from the above calculation depending on the amount of delay
in the comparator circuit. Also, at high frequencies this comparator delay can cause triangle wave
overshoot or undershoot, skewing the dead band threshold. Confirm the actual value in implementation
and adjust the constants accordingly.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| HA16116 | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| HA16121FP | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| HA16116FP | 1500000 SYSTEM GATE 1.5 VOLT FPGA |
| HA16116FPJ | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HA16129 | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:Single Watchdog Timer |
| HA16129AFPJ | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Regarding the change of names mentioned in the document, such as Hitachi Electric and Hitachi XX, to Renesas Technology Corp. |
| HA16129FPJ | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:Single Watchdog Timer |
| HA16138 | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:AC/DC Switching Converter Controller IC With High-Voltage Power MOS FET |
| HA16138PS | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:AC/DC Switching Converter Controller IC With High-Voltage Power MOS FET |
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