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參數(shù)資料
| 型號： | AN8027 |
| 廠商： | PANASONIC CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | AC-DC switching power supply control IC with standby mode |
| 中文描述： | 1 A SWITCHING CONTROLLER, 80 kHz SWITCHING FREQ-MAX, PSIP9 |
| 封裝： | PLASTIC, SIP-9 |
| 文件頁數(shù)： | 8/28頁 |
| 文件大小： | 301K |
| 代理商： | AN8027 |
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AN8027, AN8037
Voltage Regulators
8
I
Application Notes (continued)
[1] Operation descriptions (continued)
2.
Oscillation circuit (continued)
Setting the on-period (continued)
T
ON
: On-period
C
CF
V
FB
V
H-CF
: CF upper limit voltage
I
ON
: On-period discharge current
I
TR
: Flowing current at TR pin
E
IN
: Voltage on primary winding
NB
: Number of turns in the bias winding
NP
: Number of turns in the primary winding
V
Z
: Voltage on Zener diode connected to bias winding
R
TR
: Value of a resistor connected to the TR pin
The power MOSFET is turned off if the voltage at the CLM pin reaches the pulse-by-pulse overcurrent
protection threshold voltage (i.e.,
200 mV typical) when the overcurrent protection function of the IC is
operating.
T
is shortened
because large E
IN
increases I
TR
.
I
TR
: Value of a capacitor connected to CF pin
: Voltage internally converted from feedback signal I
FB
AN8027, AN8037
Current mirror
I
TR
=
I
ON
V
CC
I
ON
V
FB
250
μ
A
typ.
TR
FB
PC
C
CF
C
V
Z
R
TR
E
IN
+
E
IN
NP
NB
Out
GND
The minimum current is guaranteed
to prevent a limitless increase in T
ON
.
Figure 2. On-period block diagram and control waveform
V
H-CF
=
4 V
V
FB
V
CC
1.5 V
0 V
0 V
Current mirror
1 : 5
20 k
I
FB
Off
On
CF pin voltage
Out pin voltage
E
IN
; large
I
TR
(I
ON
); large
The maximum on-period can be used for overcurrent protection.
When the input voltage is low, the maximum on-period overcurrent protection is possible.
When the input voltage is high, the CLM pulse-by-pulse overcurrent protection is possible.
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