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PDF BD7902CFS Data sheet ( Hoja de datos )
| Número de pieza | BD7902CFS | |
| Descripción | 6CH Power Driver for CD-ROM/ DVD-ROM | |
| Fabricantes | ROHM Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de BD7902CFS (archivo pdf) en la parte inferior de esta página. Total 18 Páginas | ||
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Optical disc ICs
6CH Power Driver for
CD-ROM, DVD-ROM
BD7902CFS
BD7902CFS
BD7902CFS is a 6-channel driver IC that integrates all drivers necessary for CD-ROM, and DVD-ROM systems into a
single chip. The built-in 2-channel sled motor driver is used for the stepping motor. Low heat operation can be achieved
by applying the PWM driving system for sled and spindle motor drivers.
!Applications
CD-ROM, DVD-ROM
!Features
1) 3channel BTL driver, 2channel PWM driver and 3phase motor driver.
- ALL of the motor and actuator for CD-ROM, DVD-ROM etc.
2) These mode is able to be selected by the two control terminals.
- ON/OFF of loading, and other 5channels, brake mode select of spindle driver and standby mode.
3) Built-in triangular-wave generator.
4) Package SSOP-A54 has large power dissipation.
5) Built in thermal-shut-down circuit.
〈 Spindle driver 〉
• Efficient drive by current feedback PWM drive.
• Built in current limit, hall bias, short brake, FG output and reverse protection circuit.
• Low ON-Resistor. (RON=0.95Ω)
〈 Sled motor driver 〉
• Efficient drive by current feedback PWM drive.
• Built in 2channel for stepping motor.
〈 Actuator driver, Loading driver 〉
• Linear BTL drive system.
1/17
1 page  
Optical disc ICs
!Input output circuit
Three-phase motor driver output
19 10
Spindle driver current detection input
51pin
20
18 11 9
17
Hall signal input
54pin
54pin
1
3
5
54pin
2
4
6
BD7902CFS
Hall bias
54pin
7
FG signal output
54pin
21
PWM driver output SLED1, 2
31 32
34 35
36 37
BTL driver output FO, TK
51pin
44pin
51pin
BTL driver output LD
51pin
51pin
51pin
45 46 49 50
47 48
33
BTL driver input FO, TK, LD
51pin
51pin
26
52
53 47kΩ
PWM driver input SLED1, 2
54pin
30pin
28
29 47kΩ
PWM driver input Spindle
54pin
54pin
24
15kΩ
Control signal reference voltage input
51pin
27
10kΩ 15kΩ
50kΩ
50kΩ
Control signal input
54pin
54pin
50kΩ
50kΩ
22
23
50kΩ
5/17
5 Page 
Optical disc ICs
BD7902CFS
!Table of measure circuit switches position 2
(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 CTL
SWITCH
Designation
VIN 1 2 RL SP SL IL
Conditions
Measure
point
Spindle driver block
〈 Hall bias 〉
VHB
1.65V H H 1 1 1 1 IHB=10mA
Pin 7
〈 Hall amplifier 〉
IHIB
1.65V
H
H
1
1
1
1
Current flowing in each terminal at H−=2.5V,
HW+=2.7V (2.3V), HV=2.5V
IU+ (−),
IV+ (−),
IW+ (−)
〈 Torque command 〉
VDZSP
gmSP
∗3
L
H
2
1
1
1
∗2 Check VRNF with no output at VIN=VC±20mV
Check VRNF with output at VIN=VC±90mV
∗4 L H 2 1 1 1 See 15 of 20
VSPRNF
VSPRNF
RONUSP 3.3V H H 1 2 1 2 ILSP=500mA
RON
=
12V − VOSP
0.5A
OUTU, V, W
RONLSP
3.3V
H H 1 2 1 2 ILSP=−500mA
RON =
VOSP
0.5A
OUTU, V, W
ILIMSP
3.3V H H 2 1 1 1
VSPRNF
fosc 1.85 H H 2 1 1 1
VOSPU
〈 FG 〉
VFGH
1.65V H H 1 1 1 1 HW+=2.4V
VFG
VFGL
1.65V H H 1 1 1 1 HW+=2.6V
VFG
∗5 Condition of input
HU+
HV+
2.4V
2.6V
2.6V
2.4V
2.6V
2.6V
2.6V
2.4V
2.4V
2.6V
2.4V
2.4V
HW+
2.6V
2.6V
2.4V
2.4V
2.4V
2.6V
U
Source
Sink
Hi-Z
Sink
Source
Hi-Z
V
Hi-Z
Source
Sink
Hi-Z
Sink
Source
W
Sink
Hi-Z
Source
Source
Hi-Z
Sink
Condition
IOSPU=500mA
IOSPV=500mA
IOSPW=500mA
IOSPU=−500mA
IOSPV=−500mA
IOSPW=−500mA
Measure point
VOSPU
VOSPV
VOSPW
VOSPU
VOSPV
VOSPW
11/17
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet BD7902CFS.PDF ] | |
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