參數(shù)資料
型號(hào)： HA16120FP
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(yè)數(shù)： 8/38頁(yè)
文件大小： 275K
代理商： HA16120FP
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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