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參數(shù)資料
| 型號： | STR-F6632 |
| 廠商： | Allegro MicroSystems, Inc. |
| 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(guān)穩(wěn)壓器 |
| 文件頁數(shù)： | 5/16頁 |
| 文件大?。?/td> | 281K |
| 代理商： | STR-F6632 |
Series STR-F6600
OFF-LINE
QUASI-RESONANT FLYBACK
SWITCHING REGULATORS
5
The voltage on the V
IN
terminal (pin 4) controls startup
and shutdown of the Series STR-F6600 devices.
Figure 1 shows a typical start up circuit. The V
IN
terminal voltage during startup is shown in figure 2.
Functional Description and Operation
continued, next page...
Figure 1 – Start-Up Circuit
V
IN
TIME
DRIVE WINDING
VOLTAGE
16 V
(TYP.)
O
UNDER-VOLTAGE LOCKOUT (V
INQ
)
11 V
(MAX.)
ON-STATE VOLTAGE (V
INT
)
STARTUP
DELAY
Figure 2 – Waveform of V
IN
Terminal Voltage
at Startup
I
IN
V
IN
11 V
(MAX.)
30 mA
(MAX.)
100
μ
A
(MAX.)
14.4 V
(MIN.)
I
IN(ON)
I
IN(OFF)
V
I
V
I
Figure 3 – Supply Terminal Current, I
IN
At startup, C2 is charged through the startup resistor R
S
.
When the V
IN
terminal voltage reaches 16 V (typ.), the
control circuit enables regulator operation. Once the
regulator starts, it draws up to 30 mA from C2 causing the
voltage on C2 to fall momentarily. Once the regulator
output voltage is established, the drive winding D starts to
charge C2 via D2. The voltage on C2 thus recovers to the
nominal drive voltage (18 V).
As shown in figure 3, the input current is below 100
μ
A
(at T
M
= 25
°
C) prior to control circuit turn on. The latch
circuit holding current is 400
μ
A (max.). To ensure latch
operation, the current in R
S
at the lowest ac input voltage
should be at least 500
μ
A.
The value of R
S
thus determines the charge time of C2
and thus the startup delay. R
S
is typicaly 68 k
for wide
operation (90 V ac to 265 V ac) and 100 k
for 220 volt
ac operation.
The choice of C2 is a compromise between an accept-
able startup delay (in conjunction with R
S
) and a hold-up
time sufficient to keep pin 4 above its under-voltage
shutdown threshold of 11 V. Typically C2 is in the range
of 47
μ
F to 100
μ
F.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| STRF6652 | 制造商:ALLEGRO 制造商全稱:Allegro MicroSystems 功能描述:OFF-LINE QUASI-RESONANT FLYBACK SWITCHING REGULATORS |
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| STRF6653 | 制造商:ALLEGRO 制造商全稱:Allegro MicroSystems 功能描述:OFF-LINE QUASI-RESONANT FLYBACK SWITCHING REGULATORS |
| STR-F6653 | 制造商:SANKEN 制造商全稱:Sanken electric 功能描述:SMPS PRIMARY IC |
| STRF6654 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:STRF6654 |
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