lv4992tt Sanyo Semiconductor Corporation, lv4992tt Datasheet - Page 6

• Manufacturer Part Number: lv4992tt
• Description: For Portable Audio Equipment Stereo Se Power Amplifier
• Manufacturer: Sanyo Semiconductor Corporation

Usage Note
1. Input coupling capacitor (C3 and C5)
2. The 3rd pin capacitor (C4)
3. Standby pin (pin 2)
4. Power supply bypass capacitor (C2)
5. Short-circuit between terminals
6. Load Short-circuit
7. Maximum rating
Since the high pass filter is formated by the input coupling capacitor C3, C5 and the input resistance R1, R4, low
frequency attenuates. Therefore, it is necessary to select the capacitance value with due considelation of passband. The
capacitance value influences a shock noise when the switch is turned on, caution is demanded because the level of
shock noise becomes large when a bigger capacitance value is set.
The power supply ripple is reduced by the 3rd pin capacitor C4. The Ripple rejection ratio improves when the
capacitance value is large. However, this capacitor influences the shock noise and rise time of amplifier.
Please design with both characteristics in mind.
The standby mode and the operation mode can be switched by controlling the standby pin.
In addition, caution is necesssary since the current I ST flows to the standby pin when the standby pin is used by
working with power supply as shown in FIG.1.
The bypass capacitor must be inserted, as close as possible to the power supply pin (pin 7).
Turning on the power supply with the short-circuit between terminals leads to the deterioration and destruction of IC.
When fixing the IC to the substrate, please check that the solder is not short-circuited between the terminals before
turning on the power.
Leaving the IC in the load short-circuit for many hours leads to the deterioration and destruction of the IC.
The load must not be short-circuited absolutely.
When the rated value used is just below to the absolute maximum ratings value, there is a possibillity to exceed the
maxixmum rating value with slight extrusion variable. Also, it can be a destructive accident.
Please use within the absolute maximum ratings with sufficient variation margin of supply voltage.
Standby mode ⇒ V2 = 0 to 0.3V
Operation mode ⇒ V2 = 1.9 to V CC V
I ST =
V CC −1.4V
R3+21kΩ
(Approximate value)
LV4992TT
V CC
R3
STBY
V CC
Fig. 1
7
2
No.A0932-6/10