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PDF BD7904FS Data sheet ( Hoja de datos )
| Número de pieza | BD7904FS | |
| Descripción | 5ch Power Driver | |
| Fabricantes | ROHM Semiconductor | |
| Logotipo |  |
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Optical disc ICs
5ch Power Driver for
CD-ROM, DVD-ROM
BD7904FS
BD7904FS
BD7904FS is a 5-channel driver IC that integrates all drivers and 3.3V regulator necessary for CD-ROM, and DVD-ROM
systems into a single chip. Low head 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, 1channel PWM driver and 3phase motor driver.
- ALL of the motor and actuator for CD-ROM, DVD-ROM etc.
2) ON/OFF for each driver, brake mode switching of spindle, and stand-by mode switching can be controlled by the two
control terminals.
3) Built-in triangular-wave generator.
4) SSOP-A54 for strong head radiation.
5) Built in thermal-shut-down circuit.
6) FG 3phase synthetic output.
!Absolute maximum ratings (Ta=25°C)
Parameter
Symbol
POWER MOS
power suuply voltage
SPVM1,2,SLRNF
Preblock/BTL powerblock
power supply voltage
VCC,SLVDD,AVM
PWM control block, REG
power supply voltage
DVCC
Power dissipation
Pd
Operating temperature range
Topr
Storage temperature
Tstg
∗1 POWER MOS output terminals (10, 11, 18, 47, 48pin) is contained.
∗2 PCB (70mm×70mm×1.6mm glass epoxy) mounting.
Reduced by 20.8mW for each increase in Ta of 1°C over 25°C.
Limits
15∗1
15
7
2.6∗2
−35~+85
−55~+150
Unit
V
V
V
W
°C
°C
1/18
1 page  
Optical disc ICs
BD7904FS
Control signal reference voltage input
44pin
19
10kΩ 15kΩ
50kΩ
50kΩ
PWM driver input LOADING
44pin
44pin
53
20kΩ
×2
Regulator output
25pin
×30
25pin
20kΩ
25pin
26
VC
Regulator REGNF terminal
25pin
B.G.
51.5kΩ
32.76kΩ
27
Control signal input
28
25pin
25pin
50kΩ
50kΩ
8
9
50kΩ
5/18
5 Page 
Optical disc ICs
BD7904FS
!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 OP
Conditions
Measure
point
Spindle driver block
〈 Hall bias 〉
VHB
1.65V H H 1 1 1 1 1 IHB=10mA
Pin 22
〈 Hall amplifier 〉
IHIB
1.65V
H
H
1
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
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 1 See 10 of 18 previous page
VSPRNF
VSPRNF
RONUSP 3.3V H H 1 2 1 2 1 ILSP=500mA
RON =
12V − VOSP
0.5A
OUTU, V, W
RONLSP
3.3V
H H 1 2 1 2 1 ILSP=−500mA
RON =
VOSP
0.5A
OUTU, V, W
ILIMSP
3.3V H H 2 1 1 1 1
VSPRNF
fosc 1.85 H H 2 1 1 1 1
VOSPU
〈 FG 〉
VFGH
1.65V H H 1 1 1 1 1 HU+=2.6V, HV+=2.4V, HW+=2.4V
VFG
VFGL
1.65V H H 1 1 1 1 1 HU+=2.6V, HV+=2.6V, HW+=2.4V
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
11/18
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet BD7904FS.PDF ] | |
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