Mar. 2002
1
ZA2030
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.
Ordering Information
Part Number
Package
Temperature
ZA2030EWR 20-LD Wide SOIC -20 to
+85
* For Tape & Reel, use suffix Z (ZA2030EWR-
Z)
Features
90% Efficiency at 20W
Frequency to 600kHz
30W output at 22Vin
2.4V to 22V operation
Integrated 0.22 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)
Applications
DVD and VCD players
Audio amplifier
Home stereo
Multimedia computer
Television
Game machines
Typical Application Circuit
Mar. 2002
2
ZA2030
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
Recommended Operating
Conditions
Input Voltage Vcc
6V to 22V
Operating Frequency
20kHz to
550kHz
Feedback Input
0 to 6V
Operating Temperature
-20
C to + 85 C
Electrical Specifications
(Unless otherwise specified Vcc=22V, Ta=25
C)
Parameters Symbo
l
Condition Min
Ty
p
Max Unit
s
Controlled Voltage Output
Output voltage swing L
V
L
RL=4 F=1kHz
THD=10%
2
V
Output voltage swing H
V
H
RL=4 F=1kHz
THD=10%
20
V
PSRR
PSRR
Vin=22-21V
1
mV/V
THD+N L
THDL
RL=4Pout=100mW
0.1
%
THD+N M
THDM
RL=4Pout=10W
0.2
%
THD+N H
THDH
RL=4Pout=30W
1.0
%
Closed loop gain
A
VOL
See
Typical
Application
32
dB
Efficiency
RL=4F=1kHz
Pout=20W
90
%
Voltage Supply
Standby current
Icc(off)
Vcc = 18V, V
EN
= 0V
20
uA
Supply current (operating)
Icc(on) Typical
Application,
Vin = 0V
10
mA
Output Drivers
On resistance
Ron
0.22
Short circuit current
Isc
Cycle by cycle current
limit. Ton< 200ns
4
A
Operating clock frequency
Fop
600
kHz
Control Input
Input
Range
Pin,
Iin
0 6 V
Input Leakage
IL
5
uA
Enable EN
Enable
threshold
4.75
V
Enable current
I
EN
Enable = 5V
10
mA
Thermal shutdown
T
SD
150
C
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.
3
Mar. 2002
ZA2030
AAM
TM
30W Class-D Bridged Audio Amplifier
Pin Description
Pin No.
Pin
Name
Pin Function
1,5,6,7,15,1
6
PGnd Power
GND.
2
Out
Output (Pulse Out). Output connected to inductor.
3
Vcc
Power Supply (5.5V-22V)
4
BS
Bootstrap pin for Output FET. 1nF to Out
8
Out
Output (Pulse Out). Output connected to inductor.
9
Vcc
Power Supply (5.5V-22V)
10
BS
Bootstrap pin for Output FET. 1nF to Out
11 AGND
ANALOG
GND
12
Nin
Input to the amplifier
13
Pin
Common-mode reference voltage for the amplifier input
14,20
ENABLE LDO Output and Compensation
17 AGND
ANALOG
GND
18
Nin
Input to the amplifier
19
Pin
Common-mode reference voltage for the amplifier input
4
Mar. 2002
ZA2030
AAM
TM
30W Class-D Bridged Audio Amplifier
Reference Design for a 30W Bridged Class-D Amplifier
5
Mar. 2002
ZA2030
AAM
TM
30W Class-D Bridged Audio Amplifier
Table 1: Bill of Materials
Item Qty Description
Vendor
/
Part
#
Designation
Resistors
1 6 10K
, 5% 1/4W, leaded
Any Rop
2 1 1K
, 5% 1/4W, leaded
Any Rxp
3 2 135
, 5% 1/4W, leaded
Any RA1,
RA2
4 2 30K
, 5% 1/4W, leaded
Any RB1,
RB2
Capacitors
5
5
1F, 16V, electrolytic, leaded
Any
Ce,, Ci1, CP
6 1 1F,
50V,
ceramic,
leaded
Any
CF
7 2 0.22F,
16V,
ceramic,
leaded
Any
CBS
8 2 2.2nF,
16V,
ceramic,
leaded
Any
Cint
9
1
10F, 50V, electrolytic, leaded
Any
CVcc1
10
4
1F, 50V, ceramic, leaded
Any
CVcc, CF,
11
2
100pF, 50V, ceramic, leaded
Any
CA1, CA2
Semiconductors
12
1
1N5231, zener diode, 5%
Any
D1 (C2)
Integrated Circuits
13
1
ZA2030 20 pin DIP
Vimicro corporation
Vimicro
1
LM833 Audio Dual Op-Amp
National Semiconductor
NSC
Magnetics
14
2
39uH, 3A inductor, leaded
Any
L
Hardware
15 1 Socket,
20-pin
DIP
Any
N/A
16
1
PCB, single-sided, ZA2030EVAL, Rev
A
Any N/A
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