lm4651 National Semiconductor Corporation, lm4651 Datasheet - Page 5

• Manufacturer Part Number: lm4651
• Description: Overture? Audio Power Amplifier 170w Class D Audio Power Amplifier Solution
• Manufacturer: National Semiconductor Corporation

LM4651 Pin Descriptions
Pin No.
20,21
22,23
2,27
5,15
10
11
12
13
14
16
17
18
19
24
25
26
28
1
3
4
6
7
8
9
−V
BS
Symbol
+6V
−6V
START
E
F
E
STBY
SCKT
OUT
Delay
OUT
+V
FBK
FBK
GND
OSC
−V
HG
HG
TSD
LG
LG
BK
RR
DDBYP
RR
1
,BS
CC
BYP
BYP
EE
V
V
I
1
2
1
2
N
1
2
1
2
O
O
2
The reference pin of the power MOSFET output to the gate drive circuitry.
The bootstrap pin provides extra bias to drive the upper gates, HG
High−Gate # 1 is the gate drive to a top side MOSFET in the H-Bridge.
High−Gate # 2 is the gate drive to a top side MOSFET in the H-Bridge.
The ground pin for all analog circuitry.
The internally regulated positive voltage output for analog circuitry. This pin is available
for internal regulator bypassing only.
The positive supply input for the IC.
The internally regulated negative voltage output for analog circuitry. This pin is available
for internal regulator bypassing only.
The feedback instrumentation amplifier output pin.
The error amplifier inverting input pin. The input audio signal and the feedback signal are
summed at this input pin.
The error amplifier output pin.
The thermal shut down input pin for the thermal shut down output of the LM4652.
Standby function input pin. This pin is CMOS compatible.
The feedback instrumentation amplifier pin. This must be connected to the feedback filter
from V
The switching frequency oscillation pin. Adjusting the resistor from 15.5k
changes the switching frequency from 75kHz to 225kHz.
The dead time setting pin.
Short circuit setting pin. Minimum setting is 10A.
The feedback instrumentation amplifier pin. This must be connected to the feedback filter
from V
The regulator output for digital blocks. This pin is for bypassing only.
The negative voltage supply pin for the IC.
The start up capacitor input pin. This capacitor adjusts the start up time of the diagnostic
sequence for the modulator. Refer to Start up Sequence and Timing in the
Application Information section.
Low−Gate # 1 is the gate drive to a bottom side MOSFET in the H-Bridge.
Low−Gate # 2 is the gate drive to a bottom side MOSFET in the H-Bridge.
The reference pin of the power MOSFET output to the gate drive circuitry.
O1
O2
(pin 15 on the LM4652 ).
(pin 7 on the LM4652 ).
5
Description
1
,HG
2
.
to 0
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