IRU3037 查看數據表（PDF） - International Rectifier

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IRU3037

8-PIN SYNCHRONOUS PWM CONTROLLER

International Rectifier 

IRU3037/IRU3037A & (PbF)

PARAMETER

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

SYM

TEST CONDITION

IFB1 SS=3V, Fb=1V

IFB2 SS=0V, Fb=1V

gm

Freq IRU3037

IRU3037A

VRAMP

Tr CL=1500pF

Tf CL=1500pF

TDB

TON Fb=1V, Freq=200KHz

TOFF Fb=1.5V

MIN TYP MAX UNITS

-0.1

µA

-64

µA

410

600

830 µmho

180

200

220

KHz

345

400

440

1.225 1.25 1.275

V

50

100

ns

50

100

ns

50

150

250

ns

85

90

95

%

0

0

%

PIN DESCRIPTIONS

PIN#

1

PIN SYMBOL PIN DESCRIPTION

Fb

This pin is connected directly to the output of the switching regulator via resistor divider to

provide feedback to the Error amplifier.

2

Vcc

This pin provides biasing for the internal blocks of the IC as well as power for the low side

driver. A minimum of 1µF, high frequency capacitor must be connected from this pin to

ground to provide peak drive current capability.

3

LDrv

Output driver for the synchronous power MOSFET.

4

Gnd

This pin serves as the ground pin and must be connected directly to the ground plane. A

high frequency capacitor (0.1 to 1µF) must be connected from V5 and V12 pins to this pin

for noise free operation.

5

HDrv

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.

6

Vc

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 1µF, high frequency capacitor must be connected from this pin to ground to

provide peak drive current capability.

7

Comp

Compensation pin of the error amplifier. An external resistor and capacitor network is

typically connected from this pin to ground to provide loop compensation.

8

SS / SD 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.

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