AAM
TM
30W Class-D Bridged Audio Amplifier
General Description
The ZA2030 is a fully integrated 30W bridged
Class-D Audio Amplifier. This simple, low-cost
amplifier exhibits the high fidelity of a Class-A/B
amplifier at very high efficiencies. The circuit is
based on the proprietary variable frequency
topology Analog Adaptive Modulation (AAM,
Patent pending) that delivers excellent PSRR,
fast response time and operates over a wide
supply voltage range.
ZA2030
Features
•
•
•
•
•
•
•
•
•
•
•
90% Efficiency at 20W
Frequency to 600kHz
30W output at 22Vin
2.4V to 22V operation
Integrated 0.22Ω switches
Thermal shutdown
Cycle-by-cycle short circuit protection
Amplifies full audio range with low THD+N
High open loop gain
Employs soft clipping
Standby-mode (Mute)
Ordering Information
Part Number∗
Temperature
Package
Applications
DVD and VCD players
Audio amplifier
Home stereo
Multimedia computer
Television
Game machines
ZA2030EWR
-20℃ to
+85℃
* For Tape & Reel, use suffix –Z (ZA2030EWR-
Z)
20-LD Wide SOIC
Typical Application Circuit
1
Mar. 2002
AAM
TM
30W Class-D Bridged Audio Amplifier
Absolute Maximum Ratings
Vcc
25 V
Logic Inputs
-0.3V to 6.5V
Junction Temperature
150
°C
Power Dissipation (DIP)
TBD W
Boost Pin Voltage
Vsw + 6V
Thermal resistance (DIP)
TBD
°C
/W
Storage Temperature
–55
°C
to
+150
°C
ZA2030
Recommended Operating
Conditions
Input Voltage Vcc
Operating Frequency
550kHz
Feedback Input
Operating Temperature
6V to 22V
20kHz to
0 to 6V
-20
°C
to + 85
°C
Electrical Specifications
(Unless otherwise specified
Parameters
Symbo
l
Condition
Controlled Voltage Output
Output voltage swing L
V
L
Output voltage swing H
PSRR
THD+N L
THD+N M
THD+N H
Closed loop gain
Efficiency
Voltage Supply
Standby current
Supply current (operating)
Output Drivers
On resistance
Short circuit current
Operating clock frequency
Control Input
Input Range
Input Leakage
Enable
Enable current
Thermal shutdown
V
H
PSRR
THDL
THDM
THDH
A
VOL
η
Vcc=22V, Ta=25
°C)
Min
2
Ty
p
Max
Unit
s
V
RL=4Ω F=1kHz
THD=10%
RL=4Ω F=1kHz
THD=10%
Vin=22-21V
RL=4ΩPout=100mW
RL=4ΩPout=10W
RL=4ΩPout=30W
See Typical Application
RL=4ΩF=1kHz
Pout=20W
Vcc = 18V, V
EN
= 0V
Typical Application,
Vin = 0V
20
1
0.1
0.2
1.0
32
90
V
mV/V
%
%
%
dB
%
Icc(off)
Icc(on)
Ron
Isc
Fop
Pin, Iin
IL
EN
I
EN
T
SD
20
10
0.22
4
600
0
6
5
10
150
uA
mA
Ω
A
kHz
V
uA
V
mA
C
Cycle by cycle current
limit. Ton< 200ns
Enable threshold
Enable = 5V
4.75
Note 1.
Exceeding these ratings may damage the device.
Note 2.
The device is not guaranteed to function outside its operating rating.
Note 3.
Measured on approximately 1” square of 1 oz. copper surrounding device leads.
2
Mar. 2002
AAM
TM
30W Class-D Bridged Audio Amplifier
Pin Description
Pin No.
1,5,6,7,15,1
6
2
3
4
8
9
10
11
12
13
14,20
17
18
19
Pin
Name
PGnd
Out
Vcc
BS
Out
Vcc
BS
AGND
Nin
Pin
ENABLE
AGND
Nin
Pin
Pin Function
Power GND.
Output (Pulse Out). Output connected to inductor.
Power Supply (5.5V-22V)
Bootstrap pin for Output FET. 1nF to Out
Output (Pulse Out). Output connected to inductor.
Power Supply (5.5V-22V)
Bootstrap pin for Output FET. 1nF to Out
ANALOG GND
Input to the amplifier
Common-mode reference voltage for the amplifier input
LDO Output and Compensation
ANALOG GND
Input to the amplifier
Common-mode reference voltage for the amplifier input
ZA2030
3
Mar. 2002
AAM
TM
30W Class-D Bridged Audio Amplifier
Reference Design for a 30W Bridged Class-D Amplifier
ZA2030
4
Mar. 2002
AAM
TM
30W Class-D Bridged Audio Amplifier
ZA2030
Table 1: Bill of Materials
Item
1
2
3
4
5
6
7
8
9
10
11
12
13
Qty
Description
Resistors
6
10KΩ,
±5%
1/4W, leaded
1
1KΩ,
±5%
1/4W, leaded
2
135Ω,
±5%
1/4W, leaded
2
30KΩ,
±5%
1/4W, leaded
Capacitors
5
1µF, 16V, electrolytic, leaded
1
1µF, 50V, ceramic, leaded
2
0.22µF, 16V, ceramic, leaded
2
2.2nF, 16V, ceramic, leaded
1
10µF, 50V, electrolytic, leaded
4
1µF, 50V, ceramic, leaded
2
100pF, 50V, ceramic, leaded
Semiconductors
1
1N5231, zener diode, 5%
Integrated Circuits
1
ZA2030 20 pin DIP
1
LM833 Audio Dual Op-Amp
Magnetics
2
39uH, 3A inductor, leaded
Hardware
1
Socket, 20-pin DIP
1
PCB, single-sided, ZA2030EVAL, Rev
A
Vendor / Part #
Any
Any
Any
Any
Any
Any
Any
Any
Any
Any
Any
Any
Vimicro corporation
National Semiconductor
Any
Any
Any
Designation
Rop
Rxp
RA1, RA2
RB1, RB2
Ce,, Ci1, CP
CF
CBS
Cint
CVcc1
CVcc, CF,
CA1, CA2
D1 (C2)
Vimicro
NSC
L
N/A
N/A
14
15
16
5
Mar. 2002
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