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STABP01

December 2002

s

BASH® LICENCE REQUIRED

DESCRIPTION

The STABP01 processor is used to control the

BASH® Digital Converter. When used in conjunction

with BASH® amplifiers a fully integrated high efficien-

cy power amplifier is realized.

By analyzing

the audio input, the Processor deter-

mines the appropriate on/off events and generates a

digital pulse for the Digital Converter. The converter

turns this pulse into a power signal that feeds the

power amplifier. The feedback system allows the pro-

cessor to constantly adapt to the audio signal and re-

generate the digital pulse thereby maintaining a

constant voltage across the output devices.

ORDERING NUMBERS:

STABP01 (DIP20)

STABP01D (SO20)

SO20

DIP20

DIGITAL PROCESSOR

BLOCK DIAGRAM

+

-

+

+

-

-

R

1V

1V

10V

1V

OUTPUT

GROUND1

SOFT SW RESET

S

1V

10V

2R

R

1V

COMP/3

1V

1V

BUFFER

2200pF

50K

20K

R162

17R

C51

2200pF

1V

CURRENT SENSE

COMPARATOR

ONE SHOT

SIGNAL

OPEN DRAIN

OUTPUT

DISCHARGE

(RESET)

TRANSISTOR

FAST ATTACK

CONTROL

ERROR

AMP

COMP

CURRENT_SENSE

V+

POWER SUPPLY1

CLOCK

250Hz

1V

Q

Q

S

Q

R

Q

RESET

CLK

Q

D

Q

RESET

CLK

D

Q

Q

R

S

Q

Q

INTERNAL

CIRCUIT

ON

UVLO: 7V = on

5V = off

SOFT SWITCH

PWM LATCH

VREF

BUFFER OUT

REC_OUT

BUFFER IN

FA IN

1V

10V

10V

DEAD TIME

10V

D00AU1219

OUTPUT

GROUND2

ONE

SHOT

DELAY

POWER_VS2

ONE SHOT

DUTY ACCEL

1V

1V

R