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參數(shù)資料
| 型號： | 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 |
| 文件頁數(shù)： | 12/22頁 |
| 文件大小： | 179K |
| 代理商： | AN8038S |
AN8038, AN8038S
Voltage Regulators
12
I
Application Notes (continued)
[2] Operation descriptions (continued)
2. Oscillator circuit (continued)
Notes on switching from RCC operation to discontinuous operation
When the state changes from normal load to standby mode, the post-I-V conversion output monitor voltage V
FB
increases along with the increase of the amount of feedback current. Then, when the IFB pin feedback current
exceeds 1 mA (typical) and the VFB voltage becomes larger than the RSTB pin (pin 2) voltage, the minimum off-
period current that is from the CF pin lower limit value until the RSTB pin voltage is reached, is rapidly reduced,
and the operating frequency is lowered. (See figure 3.) This allows the switching loss to be reduced to the mini-
mum, and allows the standby mode power to be reduced.
Furthermore, the RSTB pin voltage, which is operating point for switching from RCC operation to
discontinuous operation, is set by resistor-division of the internal 7 V reference voltage to a typical value of 3.5 V.
This value can be adjusted by connecting an external pull-down resistor, and this can be used to suppress in-
creases of the minimum off-period.
Note that application designs must take into account the sample-to-sample variations of
±
15% in the internal
resistors and temperature coefficient of 2 400 ppm/
°
C.
Figure 3. Off-period block diagram and control waveforms
a) Normal control - heavy load (I
IFB
<
1 mA)
b) Standby (I
IFB
>
1 mA)
4.2 V
CF pin voltage
Out pin voltage
0.2 V
0 V
0 V
V
RSTB
V
CC
1.5 V
V
FB
t
OFF(min)
t
OFF
On
4.2 V
CF pin voltage
Out pin voltage
0.2 V
0 V
0 V
V
RSTB
V
CC
1.5 V
V
FB
t
OFF(min)
t
OFF
On
The minimum off-period
current is reduced
when V
FB
≥
V
RSTB
.
t
OFF (min)
: large
IFB
RSTB
I
OFF
=
1250
μ
A typ.
(I
IFB
<
1 mA)
I
OFF
=
55
μ
A typ.
(I
IFB
>
1 mA)
C
C
CF
V
CC
GND
Out
E
IN
+
E
IN
Current mirror
5 : 1
I
OFF
20 k
PC
V
FB
17.5 k
17.5 k
7 V
7 V
Comp.
N
P
N
B
Allows the
control switching
operating point
to be lowered.
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