BA5921FP [ROHM]
4-channel BTL driver for CD player and CD-ROM drives; 4通道BTL驱动器CD播放器和CD -ROM驱动器
| 型号： | BA5921FP |
| 厂家： | 
ROHM |
| 描述： | 4-channel BTL driver for CD player and CD-ROM drives |
| 文件： | 总9页 (文件大小：147K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Optical disc ICs
4-channel BTL driver for CD player
and CD-ROM drives
BA5921FP
The BA5921FP is an IC with an internal 4-channel BTL driver for CD players and CD-ROM driver actuators and motors,
as well as an internal standard operational amplifier. In addition, the 28-pin HSOP package allows for application minia-
turization.
FApplications
CD players, CD-ROM drives
FFeatures
1) 4-channel BTL driver.
4) Internal thermal shutdown circuit.
2) HSOP 28-pin power package allows for application
miniaturization.
5) Gain is adjustable with an attached resistor.
6) Internal standard operational amplifier.
7) Output current is mutable with an external mute pin.
3) Wide dynamic range. (typically 3.6V when VCC = 5V
and RL = 8Ω)
FAbsolute maximum ratings (Ta = 25_C)
FRecommended operating conditions (Ta = 25_C)
269
Optical disc ICs
BA5921FP
FBlock diagram
FPin descriptions
270
Optical disc ICs
BA5921FP
FPin equivalent circuit diagrams
271
Optical disc ICs
BA5921FP
FElectrical characteristics (unless otherwise noted, Ta = 25_C, VCC = 5V, BIAS = 2.5V, RL = 8Ω)
272
Optical disc ICs
BA5921FP
FM
273
Optical disc ICs
BA5921FP
FMeasurement circuit switch table
(1) Driver (OPIN! 1, NF! 1, OPRL! 1, VOPIN = 2.5V)
(2) Operational amplifier (RL! OFF)
274
Optical disc ICs
BA5921FP
FApplication example
275
Optical disc ICs
BA5921FP
FOperation notes
(1) The BA5921FP has a thermal shutdown circuit.
The output current is muted when the chip temperature
rises above 175_C (typically). When the chip tempera-
ture falls to 150_C (typically), the driver circuit starts up
again.
(4) The internal circuits turn off when the supply volt-
age drops below 3.8V (typically), and turn on again when
it rises above 4.0V (typically).
(5) Muting occurs during thermal shutdown, mute-on
operations or a drop in the bias pin voltage or supply volt-
age. In each case, only the drivers are muted. During
muting, the output pins remain at the internal bias volt-
age, roughly (VCC*VF)/2.
(2) The output current can be muted by opening the
mute pin (pin 9) or lowering it below 0.5V. During ordinary
use, pin 9 should be pulled up above 2.0V.
(3) Muting also occurs when the bias pin (pin 2) drops
below1.4V(typically). Makesureitstaysabove1.7Vdur-
ing normal use.
(6) Connect the IC to a 0.1µF bypass capacitor be-
tween power supplies, at the base of the IC.
(7) The radiating fin is connected to the package’s in-
ternal GND, but should also be connected to an external
ground.
FElectrical characteristic curves
276
Optical disc ICs
BA5921FP
FExternal dimensions (Units: mm)
277
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