參數(shù)資料
型號(hào)： AN8038S
廠商： PANASONIC CORP
元件分類： 穩(wěn)壓器
英文描述： AC-DC switching power supply control IC with RCC local resonance circuit for improved conformance with energy conservation laws
中文描述： 2 A SWITCHING CONTROLLER, PDSO8
封裝： 0.225 INCH, PLASTIC, SOP-8
文件頁(yè)數(shù)： 14/22頁(yè)
文件大?。?/td> 179K
代理商： AN8038S
AN8038, AN8038S
Voltage Regulators
14
I
Application Notes (continued)
[2] Operation descriptions (continued)
3. Local resonance operation (power MOSFET turn on delay circuit)
The AN8038 and AN8038S transformer reset detection functions detect a low-level input to the TR pin. (This
is similar to earlier Panasonic ICs, in particular the AN8026, AN8027, AN8028, and AN8029.)
Local resonance operation is possible with circuits as shown in figure 4. C7 is the resonance capacitor, and R9
and C9 form a delay circuit for adjusting the power MOSFET turn on time.
When the power MOSFET is off, the voltage that occurs in the drive winding is input to the TR pin (pin 1)
through R9 and C9. The power MOSFET will be held in the off state while a high level (a level higher than the
threshold voltage, which is 0.25 V typical) is input to the TR pin.
The TR pin also has a clamping capability for upper and lower limit voltages. The upper limit voltage is clamped
at 1.5 V typical (sink current is
3 mA), and the lower limit voltage is clamped at about
0.15 V typical (source
current: 3 mA). (See figure 5.) The power MOSFET off-period is determined by the longer period of the follow-
ing two periods: the period until the TR pin input voltage becomes lower than the threshold voltage as the bias
winding voltage falls after the transformer discharges its energy, and the minimum off-period t
OFF(min)
stipulated
by the internal oscillator (see the description of the oscillator circuit). As a result, ringing in the bias winding does
not be regarded as a turn on signal during the minimum off-period.
Figure 4
N
S
V
O
D
B
N
P
N
B
E
IN
E
IN
+
Upper limit
clamp current
Upper limit clamp
1.5 V typ.
0.25 V typ.
Out
TR
C9
R9
C7
V
CC
GND
Startup resistor
R1
Lower limit
clamp current
Lower limit clamp
0.15 V typ.
Transformer reset
comparator
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