NCP1392B_09 ONSEMI [ON Semiconductor], NCP1392B_09 Datasheet - Page 17

• Manufacturer Part Number: NCP1392B_09
• Description: High-Voltage Half-Bridge Driver with Inbuiltc Oscillator
• Manufacturer: ONSEMI [ON Semiconductor]

Non−Latched Enable Input (B Version only)
the BO terminal voltage grows above 2 V threshold. The
enable comparator features 100 mV hysteresis so the BO
terminal has to go down below 1.9 V to recover IC operation.
The non−latched input stops output drivers immediately
Dimming
Input
Vbulk_OFF
Vbulk_ON
DRV_EN
BO_OK
Figure 36. Dimming Feature Implementation Using Nonlatched Input on BO Terminal
Vbulk
VBO
Vcc
R1
1 V
R2
R3
Figure 35. BO Input Functionality − V
Q1
R4
D1
V
Q2
CC
C
R
SS
fstart
V
bulk
R
R
upper
lower
R
t
http://onsemi.com
BO
Rt
I
hyste
17
SW
bulk
This input offers other features to the NCP1392 like
dimming function for lamp ballasts (Figure 36) or skip
mode capability for resonant converters (Figures 37
and 39).
< V
PFCdelay
bulk2
+
−
+
−
V
V
refEN
refBO
High Level for BOdisch time after V
, PFC Start Follows
+
−
+
−
GND
NCP1392
0.5ms
Filter
20ms
Filter
To PFC Delay
CC
to AND gates
to AND gates
ON