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CS3351YDR14 データシート(PDF) 6 Page - ON Semiconductor

部品番号 CS3351YDR14
部品情報  Alternator Voltage Regulator Darlington Driver
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メーカー  ONSEMI [ON Semiconductor]
ホームページ  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

CS3351YDR14 データシート(HTML) 6 Page - ON Semiconductor

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CS3341, CS3351, CS387
http://onsemi.com
6
REGULATION WAVEFORMS
The CS3341/3351/387 utilizes proportion control to
maintain regulation. Waveforms depicting operation are
shown in Figures 4, 5 and 6, where VBAT/N is the divided
down voltage present on the Sense pin using R1 and R2
(Figure 7). A sawtooth waveform is generated internally.
The amplitude of this waveform is listed in the electric
parameter section as proportion control. The oscillator
voltage is summed with VBAT/N, and compared with the
internal voltage regulator (VREG) in the regulation
comparator which controls the field through the output
“Device Driver.”
Figure 4 shows typical steady−state operation. A 50%
duty cycle is maintained.
Figure 5 shows the effect of a drop in voltage on (VBAT/N
+ VOSC). Notice the duty cycle increase to the field drive.
Figure 6 shows the effect of an increase in voltage (above
the regulation voltage) on (VBAT/N + VOSC). Notice the
decrease in field drive.
Figure 4. 50% Duty Cycle,
Steady State
Figure 5. > 50% Duty Cycle,
Increased Load
Figure 6. < 50% Duty Cycle,
Decreased Load
VREG
VBAT/N + VOSC
VREG
VREG
VBAT/N + VOSC
Field Driver On
Field Driver On
Field Driver On
VBAT/N + VOSC
Figure 7. Typical Application DIagram
D1
C3
BATTERY
2N6284
Power
Darlington
POWER GROUND
R4
18 k
W
C1
0.1
mF
R2
50 k
W
0.047
mF
C4
0.022
mF
R6
20 k
W
R9
2.4 k
W
GND
Driver
SC
STATOR
STATOR
RECTIFIER
S
A
F
I
FIELD
Lamp Indicator
R10
510
W
IGNITION
SWITCH
R7
MPSA13
or CS299
*Note: C2 optional for reduced jitter.
LAMP
VCC
Sense
OSC
IGN
*C2
10
mF
R1
100 k
W
R5 10 k
W
R3
250
W
10
W
MR2502
MR2502
MR2502


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