TB2921HQ Toshiba, TB2921HQ Datasheet - Page 3

• Manufacturer Part Number: TB2921HQ
• Manufacturer: Toshiba

Specifications of TB2921HQ

• No. Of Channels: 4
• Package: HZIP 25-P-1.00F
• Recommended Vcc (v): 13.2
• Rl=2 Ohm: 80W x 4
• Rl=4 Ohm: 50W x 4
• Rl=8 Ohm: -
• Features/built-in Functions: 4 BTL channels, standby switch, mute, low-RON BiCD process, high-side switch
• Operating Voltage (v): 9 to 18

Caution and Application Method
(Description is made only on the single channel.)
1. Standby SW Function
When changing the time constant of pin 4, check the
pop noise.
High and Low, the power supply can be set to ON
and OFF. The threshold voltage of pin 4 is set at
about 3V
about 2 µA (typ.) in the standby state.
Control Voltage of Pin 4: V
Advantage of Standby SW
(1)
(2)
By means of controlling pin 4 (standby pin) to
Standby
OFF
ON
Since V
omitted.
Since the control current is microscopic, the switching relay of small current capacity is satisfactory
for switching.
BE
(typ.), and the power supply current is
CC
can directly be controlled to ON or OFF by the microcomputer, the switching relay can be
Power
OFF
ON
Stand-By
V
CC
Small current capacity switch
(pin 4)
Large current capacity switch
V
V
2.5~6 V
0~0.5
CC
SB
SB
(V)
Battery
– Standby Switch Method –
Battery
– Conventional Method –
Figure 2
3
OFF
From microcomputer
ON
Figure 1 With pin 4 set to High,
V
Power
Stand-By
CC
4
V
Relay
10 kΩ
CC
Power is turned ON
From
microcomputer
V
Battery
Battery
CC
≈ 2 V
BE
to BIAS
CUTTING CIRCUIT
TB2921HQ
2006-05-25