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IRU3048CF Datasheet(PDF) 3 Page - International Rectifier

Part # IRU3048CF
Description  DUAL SYNCHRONOUS PWM CONTROLLER CIRCUITRY AND LDO CONTROLLER
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Manufacturer  IRF [International Rectifier]
Direct Link  http://www.irf.com
Logo IRF - International Rectifier

IRU3048CF Datasheet(HTML) 3 Page - International Rectifier

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IRU3048
3
Rev. 1.7
09/12/02
www.irf.com
PARAMETER
SYM
TEST CONDITION
MIN
TYP
MAX
UNITS
PIN DESCRIPTIONS
PIN#
PIN SYMBOL
PIN DESCRIPTION
Error Amp
Fb Voltage Input Bias Current
Fb Voltage Input Bias Current
Transconductance 1
Transconductance 2
Oscillator
Frequency
Ramp Amplitude
Output Drivers
Rise Time
Fall Time
Dead Band Time
Max Duty Cycle
Min Duty Cycle
LDO Controller
Drive Current
Fb Voltage
Input Bias Current
SS=3V
SS=0V
CL=1500pF
CL=1500pF
Fb=1V, Freq=200KHz
Fb=1.5V
180
50
85
0
30
1.225
-0.1
-64
400
600
200
1.25
35
50
150
90
0
45
1.25
0.5
220
100
100
250
1.275
2
mA
mA
mmho
mmho
KHz
VPP
ns
ns
ns
%
%
mA
V
mA
1
2
16
3
4
5
12
6
11
7
10
8
9
13
14
15
Gnd
Fb2
Fb1
Comp1
Comp2
VcH2
VcH1
HDrv2
HDrv1
LDrv2
LDrv1
PGnd
Vcc
VOUT3
Fb3
SS
Ground pin.
Inverting inputs to the error amplifiers. These pins work as feedback inputs for each
channel, and are connected directly to the output of the switching regulator via a resistor
divider to set the output voltages.
Compensation pins for the error amplifiers.
Supply voltage for the high side output drivers. These are connected to voltages that
must be at least 4V higher than their bus voltages (assuming 5V threshold MOSFET). A
minimum of 1
mF high frequency capacitor must be connected from these pins to PGnd
pin to provide peak drive current capability.
Output driver for the high side power MOSFET. Connect a diode, such as BAT54 or
1N4148, from these pins 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.
Output driver for the synchronous power MOSFET.
This pin serves as the separate ground for MOSFET’s driver and should be connected to
the system’s ground plane.
Supply voltage for the internal blocks of the IC.
Driver signal for the LDO’s external transistor.
LDO’s feedback pin, connected to a resistor divider to set the output voltage of LDO.
Soft-Start pin. The converter can be shutdown by pulling this pin below 0.5V.
IFB1
IFB2
gm1
gm2
Freq
VRAMP
Tr
Tf
TDB
TON
TOFF
ILDO
VFBLDO
ILDO(BIAS)


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