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NCP1608
D
1
2
8
7
PFC(Vcc)
+
1
2
8
7
+
C bulk
3
4
6
5
3
4
6
5
V CC
+
+
+
+
NCP1608
NCP1230
?
Figure 40. NCP1608 Supplied by a Downstream SMPS Controller (NCP1230)
Soft Start
When V CC exceeds V CC(on) , t start begins counting. When
t start expires, the error amplifier is enabled and begins
charging the compensation network. The drive is enabled
when V Control exceeds Ct (offset) . The charging of the
compensation network slowly increases the drive on time
from the minimum time (t PWM ) to the steady state on time.
This creates a natural soft start mode that reduces the stress
of the power components (Figure 41).
Output Driver
The NCP1608 includes a powerful output driver capable
of sourcing 500 mA and sinking 800 mA. This enables the
controller to drive power MOSFETs efficiently for medium
power ( ≤ 350 W) applications. Additionally, the driver
stage provides both passive and active pull ? down circuits
(Figure 42). The pull ? down circuits force the driver output
to a voltage less than the turn ? on threshold voltage of a
V CC
I switch
FB
V REF
Control
Ct (offset)
V out
V CC(on)
V CC(off)
Natural Soft Start
power MOSFET when V CC(on) is not reached.
t start
Figure 41. Startup Timing Diagram Showing the
Natural Soft Start of the Control Pin
V CC
+
?
UVLO
V DD
V ddGD
UVLO
DRV IN
DRV
V DD REG
m V DD
GND
Figure 42. Output Driver Stage and Pull ? Down Circuits
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