BD7904FS Ver la hoja de datos (PDF) - ROHM Semiconductor
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BD7904FS Datasheet PDF : 18 Pages
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Optical disc ICs
BD7904FS
!Table of measure circuit switches position 1
(VCC=SPVM=SLVM=12V, DVCC=AVM=5V, VC=1.65V, RL (act) =8Ω, RL (SL) =8Ω+47µH, RL (SP) =2Ω+47µH,
SLRNF=0.5Ω, SPRNF=0.33Ω, H−=2.5V, HU+=2.6V, HV+=HW+=2.4V)
INPUT
Designation
VIN
Circuit current
IQ1
−
IQ2
−
IQ3
−
IST1
−
IST2
−
Sled driver block
VDZSL
*1
gmSL
*2
RONUSL
3.3V
(0V)
RONLSL
0V
(3.3V)
ILIMSL
3.3V
(0V)
fosc
1.45
CTL
12
LH
HL
LH
LL
LL
HH
HH
HH
HH
HH
HH
SWITCH
RL SP SL IL OP
Conditions
11111
11111
11111
11111
11111
2
1
1
1
1
∗1 Check VSLRNF with no output at VIN=VC
Check VSLRNF with output at VIN=VC±40mV
2 1 1 1 1 See bellow
1 1 2 2 1 ILSL=500mA
RON= 12V − VOSL + (−)
0.5A
1 1 2 2 1 ILSL=−500mA
RON= VOSL + (−)
0.5A
21111
21111
Measure
point
IQVC
IQVC
IQDV
IQVC
IQDV
VSLRNF
VSLRNF
OUT+ (−)
OUT+ (−)
VSLRNF
VOSL+
lop
VRNF4/RNF
VRNF1/RNF
VRNF3/RNF VRNF2/RNF
VIN4 VIN3
Dead zone
SPRNF=0.33Ω
SLRNF=0.5Ω
VIN
VIN2 VIN1
∗2 Sled driver
VIN1=240mV, VIN2=140mV
VIN3=−140mV, VIN=−240mV
gm (+) =
(
VSLRNF1
240mV
−
−
VSLRNF2
140mV
)
/
0.5Ω
gm (−) =
(
VSLRNF4
240mV
−
−
VSLRNF3
140mV
)
/
0.5Ω
Iosp
Iosl
Iop
Iosp or Iosl
Iop...the peak current of Iosp or Iosl
Time
∗4 Spindle driver
VIN1=150mV, VIN2=100mV
VIN3=−100mV, VIN=−150mV
gm (+) =
(
VSPRNF1
150mV
−
−
VSPRNF2
100mV
)
/
0.33Ω
gm (−) =
(
VSPRNF4
150mV
−
−
VSPRNF3
100mV
)
/
0.33Ω
10/18
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