UTC UPC1237 is a semiconductor integrated circuit designed for protecting stereo power amplifiers and loudspeakers.
FEATURES
- Wide supply voltage range of 25V~60V.
- Contain a relay driver. (Max. I6=80mA)
- Work as either latching function or automatic resetting function by using pin 3. (In both overload detection and output offset detection, either function can be selected.)
- Single power supply.
- Built-in output offset detection function. Both positive and negative output offset can be detected through pin2.
- AC voltage can be detected.
- Time delay function. The time delay form amplifier power ON to relay ON can be freely set by selecting external components.
- The moment that amplifier-power is turned off, it can make relay broken OFF and then loudspeaker disconnected for amplifier to prevent a shock off noise.
PIN NO. | PIN NAME | DESCRIPTION |
1 | PIN1 | Input pin of overload detector |
2 | PIN2 | Input pin of output offset detector |
3 | PIN3 | Input pin of switch for latch/automatic-reset |
4 | PIN4 | Input pin of AC-OFF detector |
5 | PIN5 | GND |
6 | PIN6 | Output pin of relay driver |
7 | PIN7 | Input pin of VCC ON mute, setting delay time |
8 | PIN8 | VCC |
BLOCK DIAGRAM
TYPICAL APPLICATION CIRCUIT
uPC1237 Current sense circuit protection for amplifier