lv4993m Sanyo Semiconductor Corporation, lv4993m Datasheet - Page 7

• Manufacturer Part Number: lv4993m
• Description: For Portable Audio Equipment Monaural Btl Power Amplifier
• Manufacturer: Sanyo Semiconductor Corporation

6. Pin 4 control (second amplifier stop control function)
7. Load capacitance
8. Thermal protector circuit
9. Short-circuit between pins
10. Short-circuit of load
11. Maximum rating
The thermal protector circuit is built into in IC, and when heat is abnormally generated because of some causes, the risk
of destruction/deterioration can be reduced. The protection circuit operates when junction temperature (Tj) of the chip
in IC rises to about 165℃, the current supply source to the power amplifier is intercepted, and the signal is not output.
It returns automatically if the temperature of the chip decreases (about 140℃). This circuit must note handling enough
because it is able surely not to prevent destruction/deterioration. Turn off power promptly when you abnormally
generate heat, and pinpoint the cause.
Pin 4 are pin that control ON/OFF as for the movement of the second amplifier of the BTL amplifier. The switch of the
speaker drive (BTL output method) and the earphone drive (shingle end output method) can operate by using this
function. Moreover, it is possible to use it as a voice mute function in the BTL output method.
Make it to the opening when this function is not used.
The phase margin degree of the power amplifier might decrease by the influence of this capacitor when the capacitor is
connected by the purpose of the anti-electric wave radiation measures etc. between output pins GND and the
oscillation be caused. Note the capacity value when you add this capacitor.
When power is applied with pins left short-circuited, deterioration or damage may result.
Therefore, check before power application if pins are short-circuited with solder, etc. during mounting of IC to the
substrate.
If the load is left short-circuited for a long period of time, deterioration or damage may occur.
Never allow the load to short-circuit.
When IC is used near the maximum rating, there is a possibility that the maximum rating may be exceeded even under
the smallest change of conditions, resulting in failure. Take the sufficient margin for variation of supply voltage and
use IC within a range where the maximum rating will never be exceeded.
Second amplifier ON ⇒ V4 = 1.6 to V CC or OPEN
Second amplifier OFF ⇒ V4 = 0 to 0.3V
Recommended capacity value: 100pF or less or 1000pF to 1μF
LV4993M
No.A1962-7/13