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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(guān)穩(wěn)壓器的斬波式直流/直流轉(zhuǎn)換器 |
| 文件頁數(shù)： | 16/34頁 |
| 文件大?。?/td> | 250K |
| 代理商： | HA16116FP |
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HA16116FP/FPJ, HA16121FP/FPJ
16
6.3 Calculating Intermittent Operation Timing
Intermittent operation timing is calculated as follows.
(1) T
ON
time (the time until the IC is shut off when continuous overcurrent occurs)
3V
BE
2V
BE
T
ON
= C
ON/OFF
R
B
×
×
1
1
On duty*
= C
ON/OFF
×
R
B
×
ln1.5
×
0.4 C
ON/OFF
R
B
≈
×
1
1
On duty*
1
1
On duty*
ln
(2) T
OFF
time (when the IC is off, the time until it next goes on)
T
OFF
= C
ON/OFF
(R
A
+ R
B
)
×
ln
V
IN
2V
BE
V
IN
3V
BE
Where, V
BE
≈
0.7 V
Note: 1. On duty is the percent of time the IC is on during one PWM cycle when the pulse-by-pulse
current limiter is operating.
From the first equation (1) above, it is seen that the shorter the time T
ON
when the pulse-by-pulse current
limiter goes into effect (resulting in a larger overload), the smaller the value T
ON
becomes.
As seen in the second equation (2), T
OFF
is a function of V
IN
. Further, according to this setting, when V
IN
is
switched on, the IC goes on only after T
OFF
has elapsed.
Triangle wave
Point at which current
limiter operate
PWM output
(step-down channel)
T
t
ON
On duty =
t
ON
T
Dead band voltage
Where T = 1/f
Note: On duty is the percent of time the IC is on during one PWM cycle when
the pulse-by-pulse current limiter is operating.
OSC
Figure 6.3
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| 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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