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FDG901D Scheda tecnica(PDF) 5 Page - Fairchild Semiconductor

Il numero della parte FDG901D
Spiegazioni elettronici  Slew Rate Control Driver IC for P-Channel MOSFETs
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Produttore elettronici  FAIRCHILD [Fairchild Semiconductor]
Homepage  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

FDG901D Scheda tecnica(HTML) 5 Page - Fairchild Semiconductor

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FDG901D rev. D (W)
The Slew Rate Control Driver (FDG901D) is designed to give a programmed choice of one of
three steady dv/dt states on the output during turn-on. To change the dv/dt value, the user needs
to use the Slew Rate Control Pin (Pin 2). To utilize the smallest current setting (
≈10 nA) from the
IC, a voltage equal to Vdd must be applied to the Slew Rate Control Pin 2. To use the next
higher current setting (
≈1 µA) a voltage equal to Ground must be applied to Pin 2. To achieve the
highest current setting (
≈ 80 µA) or obtain a faster switching speed, the Slew Rate Pin2 must be
open (floating). A higher value of capacitance will result in a slower switching rate. To determine
the switching times of each setting use the simple equation:
G
g
I
Q
t
=
where Qg is the Gate charge in nC for a given MOSFET and IG is the gate current controlled by
the slew rate pin.
Below is a captured image from an oscilloscope depicting the device response. The FDG901D
was connected to control an FDG258P P-Channel DMOS. The Slew Rate control pin was set to
open (floating state).
V
IN = 5.5V
V
DD = 5.5V
R
LOAD = 1.5Ω
Test Conditions:
V
IN = 5.5V
V
DD = 5.5V
R
LOAD = 1.5Ω
Test Conditions:
V
RLoad
V
gate (inverted)
V
IN
Circuit waveforms for an FDG901D controlling a P-Channel FDG258P MOSFET.
V
RLoad
V
gate (inverted)
V
IN
Circuit waveforms for an FDG901D controlling a P-Channel FDG258P MOSFET.


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