BD7961FM Datasheet, PDF (7/10 Pages) Rohm – Power driver IC for CD changer

Optical disc ICs
!Application example
REG2 OUT
5.0V±5%
REG1 OUT
3.3V±5%
BIAS
MUTE
M
VCC2
36 35 34 33 32 31 30 29 28
CH6
VCC2
BIAS
MUTE
(POW VCC
CH5/6)
(CH1~CH4)
+ − −+
REG2
REG1
(POW GND
CH5/6)
CH5
1
2
3
+
−
Control
logic
F
R
REG2 SW
−
+
Control
logic
R
F
REG1 SW
4
5
6
7
8
9
GND2
M
LOADING1
FWD IN
LOADING2
REV IN
REG2 SW REG1 SW
LOADING1
REV IN
LOADING2
FWD IN
BD7961FM
VCC3
LOADING1
CONT
GND3
VCC1
LOADING2
CONT
27 26 25 24 23 22 21 20 19
GND3
VCC3 VCC1
CH4
CH3
(REG GND)
(PRE VCC (POW VCC
REG VCC) CH1~4)
LD
CONT1
LD
CONT2
−
+
Level shift
−
+
Level shift
47k
+−
47k
+−
23.5k
23.5k
47k
+−
47k
+−
Level shift
−
+
Level shift
−
+
23.5k
10 11
23.5k
12 13
(POW GND
CH1~CH4)
CH2
14 15 16
CH1
17 18
M
M
GND1
CH4_IN CH3_IN CH1_IN CH2_IN
The resistance values are indicated in [Ω]
Fig.4
!Operation notes
(1) BD7961FM has a built-in thermal shutdown circuit.
When the chip temperature reaches 175°C (Typ.), the output current from all drivers is muted.
When the chip temperature returns to 150°C (Typ.), the circuit of the driver unit starts up.
(2) When the mute terminal (pin33) is opened or the terminal voltage is reduced to 0.5V or less, the output current of the
BTL driver unit is muted.
In the normal state of use, pull up the voltage to 2.0V or more.
(3) When the voltage of the regulator switch terminals (pin8 and 9) is increased to 2.0V or more, the output from the
regulator is muted. In the normal state of use, pull down the voltage to 0.5V or less.
(4) When the bias terminal (pin36) voltage is reduced to 0.7V or less, the BTL driver unit is muted.
In the normal state of use, set the voltage to 1.1V or more.
(5) Thermal shutdown mutes all drivers. When the mute ON voltage and the bias terminal voltage are reduced, only the
BTL drivers are muted. When the drivers are muted, the BTL driver output terminal voltage becomes the internal bias
voltage (VCC1−0.7)/2V.
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