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IRF7460 数据表(PDF) 3 Page - International Rectifier

部件名 IRF7460
功能描述  8-PIN SYNCHRONOUS PWM CONTROLLER
Download  21 Pages
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制造商  IRF [International Rectifier]
网页  http://www.irf.com
标志 IRF - International Rectifier

IRF7460 数据表(HTML) 3 Page - International Rectifier

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IRU3037 / IRU3037A
3
Rev. 2.8
03/10/03
www.irf.com
PARAMETER
SYM
TEST CONDITION
MIN
TYP
MAX
UNITS
PIN DESCRIPTIONS
This pin is connected directly to the output of the switching regulator via resistor divider to
provide feedback to the Error amplifier.
This pin provides biasing for the internal blocks of the IC as well as power for the low side
driver. A minimum of 1
mF, high frequency capacitor must be connected from this pin to
ground to provide peak drive current capability.
Output driver for the synchronous power MOSFET.
This pin serves as the ground pin and must be connected directly to the ground plane. A
high frequency capacitor (0.1 to 1
mF) must be connected from V5 and V12 pins to this pin
for noise free operation.
Output driver for the high side power MOSFET. Connect a diode, such as BAT54 or 1N4148,
from this pin to ground for the application when the inductor current goes negative (Source/
Sink), soft-start at no load and for the fast load transient from full load to no load.
This pin is connected to a voltage that must be at least 4V higher than the bus voltage of
the switcher (assuming 5V threshold MOSFET) and powers the high side output driver. A
minimum of 1
mF, high frequency capacitor must be connected from this pin to ground to
provide peak drive current capability.
Compensation pin of the error amplifier. An external resistor and capacitor network is
typically connected from this pin to ground to provide loop compensation.
This pin provides soft-start for the switching regulator. An internal current source charges
an external capacitor that is connected from this pin to ground which ramps up the output
of the switching regulator, preventing it from overshooting as well as limiting the input
current. The converter can be shutdown by pulling this pin below 0.5V.
Error Amp
Fb Voltage Input Bias Current
Fb Voltage Input Bias Current
Transconductance
Oscillator
Frequency
Ramp-Amplitude Voltage
Output Drivers
Rise Time
Fall Time
Dead Band Time
Max Duty Cycle
Min Duty Cycle
SS=3V, Fb=1V
SS=0V, Fb=1V
IRU3037
IRU3037A
CL=1500pF
CL=1500pF
Fb=1V, Freq=200KHz
Fb=1.5V
410
180
345
1.225
50
85
0
-0.1
-64
600
200
400
1.25
50
50
150
90
0
830
220
440
1.275
100
100
250
95
mA
mA
mmho
KHz
V
ns
ns
ns
%
%
PIN#
PIN SYMBOL
PIN DESCRIPTION
1
2
3
4
5
6
7
8
Fb
Vcc
LDrv
Gnd
HDrv
Vc
Comp
SS / SD
IFB1
IFB2
gm
Freq
VRAMP
Tr
Tf
TDB
TON
TOFF


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