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PDF BH6504K Data sheet ( Hoja de datos )
| Número de pieza | BH6504K | |
| Descripción | PWM driver for CD and MD players | |
| Fabricantes | ROHM Semiconductor | |
| Logotipo |  |
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Optical disc ICs
PWM driver for CD and MD players
BH6504K
The BH6504K is a 4-channel PWM driver designed for CD and MD player motors and actuator drives. The power MOF-
SET output stage allows for applications with low power consumption. This IC also has a charge pump circuit and stan-
dard operational amplifier (needed for power MOSFET gate drives), and so supports a wide spectrum of applications.
FApplications
Portable CD players, MD players
FFeatures
1) Low power consumption.
2) A minimum of attached components.
3) Excellent gain precision because of the voltage feed-
back circuit.
4) Internal mute function for channel 1.
5) Allows for free-running and clock synchronization op-
eration.
6) Internal standard operational amplifier.
7) Internal charge pump circuit for gate drive.
8) Switchable to doubled clock synchronization.
FAbsolute maximum ratings (Ta = 25_C)
FRecommended operating conditions
226
1 page  
Optical disc ICs
BH6504K
230
5 Page 
Optical disc ICs
〈Operational amplifier〉
BH6504K
FCircuit operation
(1) PWM driver
This is an H bridge driver with four N-type FETs in the out-
put stage. Output polarity and PWM duty vary in propor-
tion to the input differential voltage between VC, and to
the absolute value. The load is direct-PWM-driven by the
square wave with this varying duty. This is a voltage feed-
back driver and so delivers a constant gain regardless of
battery voltage variation.
(2) DC / DC convertor
The DC / DC converter that generates the voltage need-
ed to drive the FETs of the output-stage H bridge. Pre.VCC
is raised to 6.5V by attaching an inductance, Schottky
barrier diode, and capacitor.
(3) Triangular wave generator
(1) Free-running oscillation
The free-running oscillation frequency of the triangular
waves can be set with an attached resistor (Rt, between
pin 16 and the ground) and capacitor (Ct, between pin 15
and the ground). The triangular wave has an amplitude
of 3 / 5 Pre.VCC at the top and VF (approximately 0.7V)
at the bottom. The ratio between rise time and fall time
is 3: 1. Free-running frequency (ft) is determined with the
following equation:
3
ft=
4
S
1
Ct S Rt 1 *
VF
3
5
Pre.Vcc
236
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet BH6504K.PDF ] | |
Hoja de datos destacado
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