參數(shù)資料
型號(hào)： TDA5147CH
廠商： NXP SEMICONDUCTORS
元件分類(lèi)： 運(yùn)動(dòng)控制電子
英文描述： 12 V Voice Coil Motor VCM driver and spindle motor drive combination chip
中文描述： DISK DRIVE MOTOR CONTROLLER, PQFP64
文件頁(yè)數(shù)： 12/32頁(yè)
文件大?。?/td> 196K
代理商： TDA5147CH
1997 Jul 09
12
Philips Semiconductors
Preliminary specification
12 V Voice Coil Motor (VCM) driver and
spindle motor drive combination chip
TDA5147CH
Power-on reset
The Power-on reset circuit monitors the voltage levels of
both the +5 V and the +12 V supply voltages as shown in
Fig.6. The PORN (active LOW) logic line is set HIGH
following a supply voltage rise above a specified voltage
threshold plus a hysteresis, and delayed by a time t
C
that
is controlled by an external capacitor. This PORN signal
should remain HIGH until either the +5 or +12 V supplies
drop below the voltage threshold, at which point the PORN
line should be asserted LOW.
The t
C
timing is set by the following equation:
C
V
th
Where V
th
= 2.5 V and I is 12
μ
A (typ.).
A negative going pulse width of 5
μ
s on either the
+5 or +12 V rail will provide a full output pulse. If another
trigger pulse occurs before the output is completed a new
output pulse will be originated. This implies the Power-on
reset circuit is a retriggerable one-shot with a maximum
trigger pulse of 5
μ
s (see Fig.7).
t
C
×
-------I
=
During a power-down situation the Power-on reset circuit
must not only generate a PORN output signal, but must
also activate the VCM retract circuitry. In doing so, the
VCM driver draws power from SHPWR2 and SHPWR3
during spin-down, and uses this power to bias the VCM
against one of the hard stops of the actuator. This prevents
the heads from landing on data zones. This BEMF supply
is isolated from the supply voltage for the drive, and is
half-wave rectified. An external retract capacitor is used to
provide the supply voltage for the retract circuit
(SHPWR1).
It should be noted that in both power-down retract and
command retract situations, the voltage across the VCM
can be adjusted (RET
ADJ
pin) to limit the velocity of the
actuator.
The status of both the VCM driver blocks and the spindle
driver blocks is shown in Tables 5 and 6.
Fig.6 Power-on reset timing.
handbook, full pagewidth
VCC
PORN
0.8 V
Vhys
threshold
t
t
tC
tC
MGG848
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TDA5147K 制造商:PHILIPS 制造商全稱(chēng):NXP Semiconductors 功能描述:12 V Voice Coil Motor VCM driver and spindle motor drive combination chip
TDA5149 制造商:PHILIPS 制造商全稱(chēng):NXP Semiconductors 功能描述:12 V Voice Coil Motor VCM driver and spindle motor pre-driver combination chip
TDA5149G 制造商:PHILIPS 制造商全稱(chēng):NXP Semiconductors 功能描述:12 V Voice Coil Motor VCM driver and spindle motor pre-driver combination chip
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