APU3048 View Datasheet(PDF) - Advanced Power Electronics Corp

Part Name

Description

View to exact match

APU3048

DUAL SYNCHRONOUS PWM CONTROLLER CIRCUITRY AND LDO CONTROLLER

Advanced Power Electronics Corp 

APU3048

PARAMETER

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

SYM

TEST CONDITION

IFB1

SS=3V

IFB2

SS=0V

gm1

gm2

Freq

VRAMP

Tr

CL=1500pF

Tf

CL=1500pF

TDB

TON Fb=1V, Freq=200KHz

TOFF Fb=1.5V

ILDO

VFBLDO

ILDO(BIAS)

MIN TYP MAX UNITS

-0.1

mA

-64

mA

400

mmho

600

mmho

180 200 220 KHz

1.25

VPP

35 100 ns

50 100 ns

50 150 250 ns

85

90

%

0

0

%

30

45

mA

1.225 1.25 1.275 V

0.5

2

mA

PIN DESCRIPTIONS

PIN#

1

2

16

PIN SYMBOL

Gnd

Fb2

Fb1

PIN DESCRIPTION

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.

3

Comp1

Compensation pins for the error amplifiers.

4

Comp2

5

VcH2

Supply voltage for the high side output drivers. These are connected to voltages that

12

VcH1

must be at least 4V higher than their bus voltages (assuming 5V threshold MOSFET). A

minimum of 1mF high frequency capacitor must be connected from these pins to PGnd

pin to provide peak drive current capability.

6

HDrv2

Output driver for the high side power MOSFET. Connect a diode, such as BAT54 or

11

HDrv1

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.

7

LDrv2

Output driver for the synchronous power MOSFET.

10

LDrv1

8

PGnd

This pin serves as the separate ground for MOSFET’s driver and should be connected to

the system’s ground plane.

9

Vcc

Supply voltage for the internal blocks of the IC.

13

VOUT3

Driver signal for the LDO’s external transistor.

14

Fb3

LDO’s feedback pin, connected to a resistor divider to set the output voltage of LDO.

15

SS

Soft-Start pin. The converter can be shutdown by pulling this pin below 0.5V.

3

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