NCP1395A/B
PIN FUNCTION DESCRIPTION
Pin No.
Symbol
Function
1
Fmin
Timing Resistor
2
Fmax
Frequency Clamp
3
DT
Deadtime
4
Css
Soft−Start
5
FB
Feedback
6
Ctimer
Timer Duration
7
BO
Brown−Out
8
Agnd
Analog Ground
9
Pgnd
Power Ground
10
A
Low Side Output
11
B
High Side Output
12
Vcc
Supplies the Controller
13
Fast Fault
Quick Fault Detection
14
Slow Fault
Slow Fault Detection
15
OUT
OPAMP Output
16
NINV
OPAMP Noninverting
Description
Connecting a resistor to this pin, sets the minimum oscillator frequency
reached for VFB is below 1.3 V.
A resistor sets the maximum frequency excursion.
A simple resistor adjusts the deadtime length.
Select the soft−start duration.
Applying a voltage above 1.3 V on this pin increases the oscillation frequency
up to Fmax.
Sets the timer duration in presence of a fault.
Detects low input voltage conditions. When brought above Vlatch, it fully
latches off the controller.
−
−
Drives the low side power MOSFET.
Drives the upper side power MOSFET.
−
Fast shutdown pin, stops all pulses when brought high. Please look in the
description for more details about the fast−fault sequence.
When asserted, the timer starts to countdown and shuts down the controller at
the end of its time duration.
Internal transconductance amplifier.
Non−inverting pin of the OPAMP.
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