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參數(shù)資料
| 型號： | HA16120FPJ |
| 廠商： | Hitachi,Ltd. |
| 英文描述： | CAP 1000PF 25V 5% NP0(C0G) SMD-0603 TR-7 PLATED-NI/SN |
| 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)： | 8/38頁 |
| 文件大小： | 275K |
| 代理商： | HA16120FPJ |
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HA16114P/PJ/FP/FPJ, HA16120FP/FPJ
8
1.2 External Synchronization
These ICs have a sync input pin so that they can be synchronized to a primary-control AC/DC converter.
Pulses from the secondary winding of the switching transformer should be dropped through a resistor
voltage divider to the sync input pin. Synchronization takes place at the falling edge, which is optimal for
multiple-output power supplies that synchronize with a flyback AC/DC converter.
The sync input pin (
SYNC
) is connected internally through a synchronizing circuit to the sawtooth
oscillator to synchronize the sawtooth waveform (see figure 1.2).
Synchronization is with the falling edge of the external sync signal.
The frequency of the external sync signal must be in the range f
OSC
< f
SYNC
< f
OSC
×
2.
The duty cycle of the external sync signal must be in the range 5% < t
1
/t
2
< 50% (t
1
= 300 ns Min).
With external synchronization, V
TH
'
can be calculated as follows.
f
OSC
f
SYNC
Note:
When not using external synchronization, connect the
SYNC
pin to the Vref pin.
V
TH
’ = (V
TH
V
TL
)
×
+ V
TL
Sawtooth wave
(f
OSC
)
V
(1.0 V typ)
SYNC
pin
(f
SYNC
)
Synchronized
at falling edge
V (1.6 V typ)
V
TH
Vref
1 V
t
1
t
2
Figure 1.2 External Synchronization
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相關代理商/技術參數(shù) |
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| HA16121FPJ | 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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