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參數(shù)資料
| 型號： | HA16116FP |
| 廠商： | Hitachi,Ltd. |
| 元件分類： | FPGA |
| 英文描述： | 1500000 SYSTEM GATE 1.5 VOLT FPGA |
| 中文描述： | 開關穩(wěn)壓器的斬波式直流/直流轉換器 |
| 文件頁數(shù)： | 8/34頁 |
| 文件大小： | 250K |
| 代理商： | HA16116FP |
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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.
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PDF描述 |
|---|---|
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| HA16129 | 1500000 SYSTEM GATE 1.5 VOLT FPGA |
| HA16129AFPJ | Regarding the change of names mentioned in the document, such as Hitachi Electric and Hitachi XX, to Renesas Technology Corp. |
| HA16138 | AC/DC Switching Converter Controller IC With High-Voltage Power MOS FET |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| HA16116FP/FPJ/ | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:HA16116FP/FPJ/ HA16121FP/FPJ Datasheet 443K/SEP.18.03 |
| HA16116FP-E | 制造商:Renesas Electronics 功能描述:DC DC Cntrlr Dual-OUT PWM DC to DC Controller/Step Down 20-Pin SOP Bulk |
| HA16116FPJ | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:Switching Regulator for Chopper Type DC/DC Converter |
| HA16117 | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:CMOS Watchdog Timer |
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