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參數(shù)資料
| 型號： | HA16114PJ |
| 廠商： | Hitachi,Ltd. |
| 元件分類： | 基準電壓源/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安培開關穩(wěn)壓器 |
| 文件頁數(shù)： | 10/38頁 |
| 文件大?。?/td> | 275K |
| 代理商： | HA16114PJ |
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HA16114P/PJ/FP/FPJ, HA16120FP/FPJ
10
2.2 Error Amplifier Usage
Figure 2.3 shows an equivalent circuit of the error amplifier. The error amplifier in these ICs is a simple
NPN-transistor differential amplifier with a constant-current-driven output circuit.
The amplifier combines a wide bandwidth (f
T
= 4 MHz) with a low open-loop gain (50 dB Typ), allowing
stable feedback to be applied when the power supply is designed. Phase compensation is also easy.
IN(
)
IN(+)
E/O
40 A
80 A
IC internal V
IN
To internal PWM
comparator
Figure 2.3 Error Amplifier Equivalent Circuit
3. Dead-Band Duty Cycle and Soft-Start Settings
3.1 Dead-Band Duty Cycle Setting
The dead-band duty cycle (the maximum duty cycle of the PWM pulse output) can be programmed by the
voltage V
DB
at the DB pin. A convenient way to obtain V
DB
is to divide the IC’s Vref output by two
external resistors. The dead-band duty cycle (DB) and V
DB
can be calculated as follows.
V
DB
= Vref
×
R
2
R
1
+ R
2
DB =
This applies when V
DB
> V
TL
.
If V
DB
< V
TL
, there is no PWM output.
V
TH
V
DB
V
TH
V
TL
×
100 (%)
Note:
V
DB
is the voltage at the DB pin.
V
TH
: 1.6 V (Typ)
V
TL
: 1.0 V (Typ)
Vref is typically 2.5 V. Select R
1
and R
2
so that 1.0 V
≤
V
DB
≤
1.6 V.
+
+
Sawtooth
wave
Sawtooth wave
Voltage at DB pin
V
TH
V
DB
V
TL
To Vref
R
R
V
DB
DB
E/O
PWM
COMP
from
UVL
Dead band
1
2
V
TH
and V
TL
vary depending on the oscillator.
Select constants by testing under implementation
conditions.
Note:
Figure 3.1 Dead-Band Duty Cycle Setting
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相關代理商/技術參數(shù) |
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|---|---|
| HA16116 | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:Switching Regulator for Chopper Type DC/DC Converter |
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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 |
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