FEATURES
- Class D/1-Bit Audio Power Output Stage
- 5 V Analog and Digital Supply Voltages
- Power Stage Power Supply 8 V to 20 V
- Output Power @ 0.1% THD + N
- Stereo Mode
- 2 20 W @ 4 @ 14.4 V
- 2 20 W @ 8 @ 20 V
- Mono Mode
- 1 40 W @ 4 @ 20 V
- RON < 320 m (per Transistor)
- Efficiency > 85% @ Full Power/8
- Clickless Mute Function
- Turn-On and Turn-Off Pop Suppression
- Short-Circuit Protection
- Overtemperature Protection
- Data Loss Protection
- 2-Channel BTL Outputs or
- 4-Channel Single-Ended Outputs
- 52-Lead Exposed Pad TQFP Package
- Low Cost DMOS Process
APPLICATIONS:
- PC Audio Systems
- Minicomponents
- Automotive Amplifiers
- Home Theater Systems
- Televisions
GENERAL DESCRIPTION:
The AD1991 is a 2-channel BTL or 4-channel single-ended class D audio power output stage. The part is configured during reset to be in either 2-channel mode or 4-channel mode. To protect the IC as well as the connected speakers, the AD1991 provides turn-on and turn-off pop suppression, short-circuit protection, and overtemperature shutdown. To control the IC, a power-down/reset input and a mute pin are available. The output stage can be operated over a power supply range from 8 V to 20 V. In 2-channel mode, Transistors A1, B2, C1, and D2 are turned on by a Logic 1 on inputs INA and INC, and Transistors A2, B1, C2, and D1 are turned on by a Logic 0 on inputs INA and INC. In 4-channel mode, Transistors A1, B1, C1, and D1 are turned on by a Logic 1 on the four inputs, and Transistors A2, B2, C2, and D2 are turned on by a Logic 0 on the four inputs (see the Functional Block Diagrams).
Circuit Diagram:
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| 2 x 20 W Class D / 1-Bit Audio Power Output Stage |
