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參數資料
| 型號： | AN8031 |
| 廠商： | PANASONIC CORP |
| 元件分類： | 模擬信號調理 |
| 英文描述： | Active filter control IC |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PSIP9 |
| 封裝： | PLASTIC, SIP-9 |
| 文件頁數： | 8/21頁 |
| 文件大?。?/td> | 205K |
| 代理商： | AN8031 |
8
AN8031
Voltage Regulators
I
Application Notes (continued)
[2] Operation descriptions (continued)
1. Normal control (continued)
2) Control outline description (Refer to figure 2 and figure 3.) (continued)
(4) Switching device current
The voltage generated in the current detection resistor which is connected to the switching device
(power MOSFET) is detected at the CS terminal. (for the above resistor, low resistance value is selected,
considering the power dissipation).
(5) Switching device turn-off
The CS terminal voltage and the multiplier output voltage are compared by the current detection
comparator. When the former value becomes larger than the latter one, the current detection comparator
sends the reset signal to the RS latch circuit to turn off the switching device.
(6) Output current supply
When the switching device is turned off, the current flowing in the transformer is cut off. The diode
is turned-on with inertia current of inductor, and supplies a current to the output of chopper circuit
(E
OUT
).
E
IN
SV
CC
Lower limit
voltage clamp
1
V
B
V
BTH
V
REF
10 V/8 V
Low voltage
protection
2.5 V
2.5 V
2.6 V
6
2
5
MPI 3
4
G
Input voltage
monitor
Upper limit
voltage clamp
One shot
Latch circuit
Overvoltage detection
Current detection
comparator
Error amp.
Timer
Drive
Multiplier
Power MOSFET
Figure 3. Explanation of block diagram and normal operation
Current detection
resistor
Power MOS
→
Off
Power MOS
→
On
2.5 V
E
E
OUT
SBD
PV
CC
9
V
OUT
CS
EI
8
Turn-on signal
(7) Transformer reset signal (V
B
) detection
When the excitation energy has been discharged and the inertia current of the inductor has been lost,
the transformer starts resonance with the frequency which depends on parasitic capacitance of the board
or parts and inductance of the inductor. This operation is detected at the V
B
terminal through sub-coil of
the transformer.
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