BA5931FP [ROHM]
4-channel BTL driver for CD players; 4通道BTL驱动器的CD播放器
| 型号： | BA5931FP |
| 厂家： | 
ROHM |
| 描述： | 4-channel BTL driver for CD players |
| 文件： | 总10页 (文件大小：157K) |
| 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 players
BA5931FP
The BA5931FP is a 4-channel BTL driver designed for CD player motors and actuators. The 28-pin HSOP package al-
lows for application miniaturization.
FApplications
CD players, CD-ROM drives
FFeatures
1) Internal drivers for focus coils, tracking coils, spindle
motors, feed motors and loading.
3) Low number of external components.
4) Driver gain is adjustable with a single attached resis-
tor.
2) HSOP 28-pin package allows for miniaturization of
applications.
5) Internal thermal shutdown circuit.
Asoltmaximm raings (Ta = 2C
FRecommended operating conditions (Ta = 25_C)
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BA5931FP
FBlock diagram
FPin descriptions
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BA5931FP
FInput/output circuits
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BA5931FP
FElectrical characteristics (unless otherwise noted, Ta = 25_C, VCC = 8V, RL = 8Ω, Vb = 2.5V)
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BA5931FP
FMeasurement circuit
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BA5931FP
FCircuit operation
(1) Driver
passed through a resistor and into the internal reference
voltage component, the preamplifier output being a sig-
nal centering on the internal reference voltage. Two sys-
tems (positive phase and negative phase) are created
during V/I conversion, generating BTL output via the
driver buffer.
Inputs to the IC are the focus tracking error signal from
the servo preamplifier and the control signal from the mo-
tor. The input signals, which normally center on 2.5V, are
V/I converted by the preamplifier, generating a current
corresponding to the input voltage. This current is
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BA5931FP
(2) Switching the loading motor driver output mode (VCC = 8V)
Note: Loading driver gain = 0dB
(3) Setting the loading driver voltage (forward mode)
Note: The loading output voltage will not exceed the power supply’s maximum output voltage, even if set above this maximum voltage.
The example above applies only when setting below the maximum outputvoltage. Maximumoutputvoltageforthepowersupplycanbeoutputbyopening
the loading input pin (19 pin).
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BA5931FP
FApplication example
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BA5931FP
FOperation notes
(1) The BA5931FP has a thermal shutdown circuit.
The output current is muted when the chip temperature
rises above 175_C (typically).
muted. During muting, the output pins remain at the inter-
nal bias voltage, (approx VCC /2).
(4) Connect the IC to a 0.1µF bypass capacitor be-
tween power supplies, at the base of the IC.
(5) The radiating fin is connected to the package’s in-
ternal GND, but should also be connected to an external
ground.
(2) The IC is muted when the bias pin (pin 23) is low-
ered below 1.4V (typically). Make sure it stays between
1.6V and 6.5V during normal use.
(3) Muting occurs during thermal shutdown or a drop in
the bias pin voltage. In each case, only the drivers are
FElectrical characteristic curves
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BA5931FP
FExternal dimensions (Units: mm)
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