AN8353UB Datasheet, PDF (4/4 Pages) Panasonic Semiconductor – High Efficiency Car Dashboard Dimmer IC

s Supplementary Description (cont.)
1M
• System Operational Principle (cont.)
0.2 (B-point) and 0.8 (C-point). The A-point in the figure
shows the I/O characteristics when the “input voltage V3/sup-
100k
ply voltage V9” is 0.7. And, when V3/V9 is from 0.05V to
about 0.2V (B-point), the duty is controlled to 0%, and when
V3/V9 is from 0.8V (C-point) to t.0V, the duty is controlled to
100%.
10k
The standby Pin8 can forcibly turn off the output transistors
by applying a voltage of about 1.1V or more to this pin.
When it is not necessary to forcibly turn off the output tran-
1k
sistors, Leave the standby Pin8 open.
100%
C
100
Turn-up Line
Duty
(I)
A
VCC=12V
VIN=6V
CT=0.001µF
CT=0.1µF
CT=0.01µF
CT=1µF
(III)
V4/V9
V6/V9
max V6/V9
max V6/V9
50%
0%
V4/V9 1
0.5
t
0.5
B
(II)
1
V3/V9
C´
A´
B´
10
1k
10k
100k
1M
10M
Resistance RT (Ω)
Fig. 3 Relations between Oscillation Frequency and CT and RT
• Duty D1 vs. Input Voltage VIN
D1 _100%
(VCC=12V)
(IV)
V1
0.5
0
TON
1/fOSC
Duty=TON · fOSC
t
Fig. 2 I/O Characteristic Chart
1
V3/V9
DG
D12V
0%
VIN–0
4V 6V
8V VIN–100
· Output voltage at ON VON
VON=VCC –V1–2
VIN
· Leakage current at OFF
IL=
V 1–2
IMΩ
• Over voltage Detecting Voltage vs. Output
• Standby Threshold Voltage vs. Output
D1
D1
50%
50%
0%
VOV
V9–2
0%
0
VSTH
V8–2