LC-26GA5E (serv.man18). (15) Major IC Information - Sharp TV Service Manual (repair manual). Page 10

 

Pin 

Function 

Description 

2, 3 

DCAP2, DCAP1 

Charge pump switching pins.  DCAP1 (pin 3) is a free running 300kHz square 
wave between VDDA and DGND (12Vpp nominal).  DCAP2 (pin 2) is level shifted 
10 volts above DCAP1 (pin 3) with the same amplitude (12Vpp nominal), 
frequency, and phase as DCAP1. 

4, 9 

V5D, V5A 

Digital 5VDC, Analog 5VDC 

5, 8,  

17 

AGND1, AGND2, 

AGND3 

Analog Ground 

6 

REF 

Internal reference voltage; approximately 1.0 VDC. 

7 

OVERLOADB 

A logic low output indicates the input signal has overloaded the amplifier. 

10, 14 

OAOUT1, OAOUT2 

Input stage output pins. 

11, 15 

INV1, INV2 

Single-ended inputs.  Inputs are a “virtual” ground of an inverting opamp with 
approximately 2.4VDC bias. 

12 

MUTE 

When set to logic high, both amplifiers are muted and in idle mode.  When low 
(grounded), both amplifiers are fully operational.  If left floating, the device stays in 
the mute mode.  This pin should be tied to GND if not used. 

16 

BIASCAP 

Input stage bias voltage (approximately 2.4VDC). 

18 

SLEEP 

When set to logic high, device goes into low power mode.  If not used, this pin 
should be grounded 

19 

FAULT 

A logic high output indicates thermal overload, or an output is shorted to ground, 
or another output. 

20, 35 

PGND2, PGND1 

Power Grounds (high current) 

22 

DGND 

Digital Ground.  Connect to AGND locally (near the TA2024). 

24, 27; 

31, 28 

OUTP2 & OUTM2; 

OUTP1 & OUTM1 

Bridged output pairs 

25, 26, 

29, 30 

VDD2, VDD2 
VDD1, VDD1 

Supply pins for high current H-bridges, nominally 12VDC. 

13, 21, 
23, 32, 

34 

NC 

Not connected.  Not bonded internally. 

33 VDDA 

Analog 

12VDC 

36 

CPUMP 

Charge pump output (nominally 10V above VDDA) 

1 

5VGEN 

Regulated 5VDC source used to supply power to the input section (pins 4 and 9). 

 

FAULT

PGND2

NC

NC

VDD2

OUTM2

OUTM1

VDD1

NC

VDDA

NC

PGND1

CPUMP

DCAP2

AGND3

BIASCAP

INV2

OAOUT2

MUTE

INV1

OAOUT1

V5A

AGND2

OVERLOADB

REF

AGND1

V5D

DCAP1

30

19

20

21

22

23

24

25

26

27

28

29

1

15

14

13

11

10

12

9

8

7

6

5

4

3

2

16

17

18

+5VGEN

36

31

32

33

34

35

OUTP1

VDD1

VDD2

OUTP2

DGND

NC

SLEEP