NCP1392B ON Semiconductor, NCP1392B Datasheet - Page 15

• Manufacturer Part Number: NCP1392B
• Description: High-Voltage Half-Bridge Driver
• Manufacturer: ON Semiconductor

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application by adding two bipolar transistors (Figure 14).
Transistor Q2 pullup BO input when dimming signal is high.
The dimming feature can be easily aid to the ballast
Dimming
Input
Figure 30. Dimming Feature Implementation Using Nonlatched Input on BO Terminal
R1
R2
R3
Q1
R4
D1
V
Q2
CC
C
R
SS
fstart
V
bulk
R
R
upper
lower
R
t
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BO
Rt
I
hyste
15
SW
In the same time the Q1 discharges soft start capacitor via
diode D1. Ballast application is enabled (including
soft−start phase) when dimming signal becomes low again.
+
−
+
−
V
V
refEN
refBO
+
−
−
+
GND
High Level for 50 ms after V
NCP1392
0.5ms
Filter
20ms
Filter
CC
ON
To PFC Delay
to AND gates
to AND gates