SA56202 Datasheet, PDF (12/24 Pages) NXP Semiconductors – One-chip motor driver

Philips Semiconductors
SA56202
One-chip motor driver
7.8 Loading motor driver
One of the linear channels is available to drive a DC loading motor. Pin V_DD(LD) is used to
set the supply voltage for the loading motor driver. Figure 11 depicts the voltage-steering
bridge topology of the SA56202.
VINLD
47 kΩ
47 kΩ
188 kΩ
188 kΩ
LDO+
VINREF
47 kΩ
47 kΩ
R
188 kΩ
R
188 kΩ
V_DD(LD)
LDO−
001aaa437
Fig 11. Voltage-steering bridge topology of linear driver.
7.9 Actuator motor drivers
Three linear channels are available to drive 3D actuators: focus, tracking and tilt. A pin
V_DD(ACT) is used to set the supply voltage for these actuator drivers. The voltage-steering
bridge topology is the same as depicted in Figure 11. The mismatch of the voltage gain of
these 3 linear channels is guaranteed to be less than 5 %.
7.10 Charge pump
The on-board charge pump generates a regulated voltage of typically 18.2 V by using the
V_DD(SPN) supply voltage. This boosted voltage is used to turn on the upper n-type DMOS
transistors of the output stages of the spindle driver, sled driver, loading driver and
actuator drivers. Recommended values for the pump-and-hold capacitor are 10 nF and
22 nF respectively (see also application diagram Figure 13). The charge pump should not
be loaded with other components or circuitry than these capacitors.
7.11 Thermal protection
If the junction temperature of the SA56202 exceeds 150 °C, then a thermal warning signal
is given at pin TEMP. TEMP has an active-LOW open-drain output for easy interfacing to
3 V and 5 V logic. The temperature hysteresis for the thermal warning is 10 °C. If the
junction temperature of the IC rises to 160 °C, then a thermal shutdown is activated that
sets all power outputs in 3-state. The temperature hysteresis for the thermal shutdown is
30 °C. As soon as the thermal shutdown deactivates at 130 °C, all motor drivers continue
normal operation.
9397 750 12772
Preliminary data sheet
Rev. 01 — 19 July 2004
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
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