FAN9612 Fairchild Semiconductor, FAN9612 Datasheet - Page 17

• Manufacturer Part Number: FAN9612
• Manufacturer: Fairchild Semiconductor

© 2008 Fairchild Semiconductor Corporation
FAN9611 / FAN9612 • Rev. 1.1.4
12. Bias Supply (V
This is the main bias source for the FAN9611/12. The
operating voltage range is between 8V and 18V. The
V
(UVLO) circuit. At power-up, the V
exceed 10.0V (±0.5V) for FAN9611 and exceed 12.5V
(±0.5V) for FAN9612 to enable operation. Both the
FAN9611 and the FAN9612 stops operating when the
V
description for important bypass information.
13. Current-Sense Protection (CS1, CS2)
The
protection for each of the power MOSFETs. The
current-sense thresholds at the CS1 and CS2 pins are
approximately 0.2V. The current measurements are
strictly for protection purposes and are not part of the
control algorithm. The pins can be directly connected to
the non-grounded end of the current-sense resistors
because the usual R-C filters of the leading-edge
current spike are integrated in the IC.
DD
DD
voltage is monitored by the under-voltage lockout
voltage falls below 7.5V (±0.5V). See PGND pin
FAN9611/12
uses
DD
)
independent
DD
voltage must
over-current
17
The time constant of the internal filter is approximately:
or


P

Figure 26. Current-Sense Protection Circuits
27

2
k




5

27
pF
1
k


130

5
pF
ns

1
2 .
MHz
www.fairchildsemi.com
(4)