2*20W Class-D Audio Amplifier
AUOB6211.00 1245
©On-BrightElectronics Confidential
OB_DOC_DBM_A_621100
- 7 -
2.3.1 Demo Board Specifications
Symbol Item Specification
Vcc Supply Voltage range 10 V to 32 V
Icc Supply current 4 A max
Continuous output power per channel: 4 , VCC = 26 V, THD+N = 10%,SE 20 W
Po Continuous output power per channel: 8 , VCC = 26 V, THD+N = 10%,BTL 40W
RL Minimum load impedance 4
Vin Input amplitude range 0~2Vrms
2.4 Operation
2.4.1 Quick Start List for Stand-Alone Operation
Follow these steps to use the OB6211 demo board stand-alone or when connecting it into existing circuits
or equipment. Connections to the demo board can be made by inserting stripped wire or using banana
plugs for the power supply and output connections. The audio inputs accept standard RCA plugs.
2.4.2 Power Supply
1. Ensure that all external power sources are set to OFF.
2. Connect an external regulated power supply adjusted from 10 V to 32 V to the POWER connector with
taking care to observe marked polarity.
2.4.3 Audio Inputs and Outputs
1. Connect a speaker across terminals LGND and LOUT. Connect another speaker across terminals
ROUT and RGND.
2. Connect an analog audio source to jacks LIN and RIN using standard RCA phono plugs.
2.4.4 Control Inputs
1. SHUTDOWN: This function is active LOW. A LOW (<0.8 V) on this device pin shuts down the amplifier;
a HIGH (>2 V) places the amplifier in the active state. Setting S(@S1) to ON places the amplifier in the
shutdown state. Setting back S(@S1) returns the amplifier to the active state. This pin is Vcc compliant.
2. MUTE: This function is active HIGH. A HIGH (>2 V) on this device pin places the amplifier in the mute
state, the outputs remain switching with 50% duty cycle; a LOW (<0.8 V) enables the sound output.
Setting M(@S1) to ON places the amplifier in the mute state. Setting back M(@S1) returns the amplifier
to the unmute state. This pin is Vcc compliant.
3. GAIN0/GAIN1: Together, these switchs determine the gain of the amplifier. Setting G1(@S2) or
G0(@S2) to ON connects the respective pin to GND. Setting G1(@S2) or G0(@S2) to OFF connects
the respective pin to VCC. Logic levels are TTL compatible. These pins are Vcc compliant. For gain
setting, please refer to Table2. Gain select setting
2.4.5 Power Up
1. Verify correct voltage and input polarity, and turn the external power supplies ON. The demo board
begins operation
2. Adjust the input signal.
3. Adjust the control inputs to the desired settings.
4. Adjust the amplifier gain by S2.
* For mono BTL application, please open the FB1 and FB2 first. Then connect a speaker across BTL+ and
BTL- that marked on PCB. Then conduct above steps.
