BD7902 데이터 시트보기 (PDF) - Unspecified
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BD7902 Datasheet PDF : 18 Pages
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Optical disc ICs
BD7902CFS
!Application example
DVCC=5V
TRACKING
FOCUS IN
IN
LOADING
M
VCC=12V
TRACKING
FOCUS
AVM=5V
SLVM=12V
SLED SLED
IN2 IN1
54 53 52 51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28
47k
LEVEL
SHIFT
LEVEL
SHIFT
LEVEL
SHIFT
47k −
+
94k
94k
47k −
+
FG
REVERSE
DETECT
HALL
BIAS
TSD
PWM
OUT
Current
COMP
FF
OSC
Polarity
COMP
3-phase
MATRIX
PRE
LOGIC
FF
Current
LIMIT
PRE
LOGIC
FF
OSC
−
47k
47k
−
47k
LIMIT
LIMIT
15k
FG
15k
STBY/
BRAKE
CONTROL
94k
47k
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27
SPINDLE
SPRNF
FG
µ-COM
µ-COM
SPINDLE
IN
5V
VC
LOADING
IN
SPVM=12V
Fig.3
!Operation notes
(1) Wiring for SPRNF and SLRNF
Considering the wiring resistance, connect each detecting resistor as close as possible to the current detection
terminals for the spindle drive SPRNF (pin 20) and the sled motor drive SLRNF 1 and 2 (pin 31 and 32) of the IC.
(2) Current detection reference voltage
The detection of current in the spindle and sled involves the detection of voltage between the detection resistances,
but as the reference voltage of internal circuit, the voltage applied to VCC (pin 51) is used by the spindle and that
applied to SLVDD (pin 30) by the sled.
For this reason, be sure to apply VCC (pin 51) to the spindle and SLVDD (pin 30) to the sled according to the
corresponding power supply voltages to prevent voltage differences.
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