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參數(shù)資料
| 型號(hào)： | STR-F6626 |
| 廠商： | SANKEN ELECTRIC CO LTD |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| 中文描述： | 26 A SWITCHING REGULATOR, PZFM5 |
| 封裝： | TO-3P, 5 PIN |
| 文件頁數(shù)： | 8/16頁 |
| 文件大小： | 281K |
| 代理商： | STR-F6626 |
Series STR-F6600
OFF-LINE
QUASI-RESONANT FLYBACK
SWITCHING REGULATORS
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
TM
8
Functional Description and Operation (cont’d)
Figure 7 - Voltage Regulation Waveforms
Normal Operation (Quasi-Resonant) Mode
Refer to the Functional Block Diagram, Typical Appli-
cation diagram (figure 6), and Quasi-Resonance Wave-
forms (figure 8).
Regulation is achieved as in fixed off-time mode but
instead of having a fixed off-time, the demagnetization of
the transformer is sensed by a second comparator. This
comparator threshold, V
th(2)
is nominally 1.45 V.
Quasi-
resonance sensing makes use of the natural magnetizing
and leakage inductances and self-capacitances of the
power circuit.
Figure 8 shows the drain voltage waveform, (V
DS
), on
pin 3 of the STR-F66xx, as well as V
P
, the voltage on the
primary of the transformer.
Once the current in the output diode stops flowing, the
primary stored energy ‘rings’ as shown by V
P
and V
DS
.
The resonant frequency (f
r
) is determined by the magne-
tizing inductance of the transformer and the capacitor C4.
The addition of this capacitor sets the ringing frequency
and reduces the harmonic content in the V
DS
waveform,
lowering EMI. Also since V
DS
falls to a minimum during
the first half-cycle of the ring this point can be sensed and
used to turn on the MOSFET with minimum voltage
across it. Thus the MOSFET is low voltage and zero
current switched (LVS/ZCS).
Figure 8 – Quasi-Resonance Waveforms
Dwg. GK-021
V
P
V
DS
V
D
I
D
t =
π√
L
p
C
4
f
R
= 1/2
π√
L
p
C
4
V
DS
(min)
V
P
V
IN
V
OCP
≈
2.8 V
V
th(2)
≈
1.45 V
V
th(1)
≈
0.73 V
V
FDBK
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| STRF6628 | 制造商:ALLEGRO 制造商全稱:Allegro MicroSystems 功能描述:OFF-LINE QUASI-RESONANT FLYBACK SWITCHING REGULATORS |
| STR-F6628 | 制造商:Panasonic Industrial Company 功能描述:STATOR UNITSUB:C1DA00000275 |
| STRF6629B | 制造商:Distributed By MCM 功能描述:SANKEN IC 制造商:Panasonic Industrial Company 功能描述:IC PANASONIC |
| STRF6632 | 制造商:ALLEGRO 制造商全稱:Allegro MicroSystems 功能描述:OFF-LINE QUASI-RESONANT FLYBACK SWITCHING REGULATORS |
| STR-F6632 | 制造商:SANKEN 制造商全稱:Sanken electric 功能描述:OFF-LINE QUASI-RESONANT FLYBACK SWITCHING REGULATORS |
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