L6232B SGS-Thomson-Microelectronics, L6232B Datasheet

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L6232B

Manufacturer Part Number
L6232B
Description
Manufacturer
SGS-Thomson-Microelectronics
Datasheet
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DESCRIPTION
The L6232B is a triple half bridge driver intended
for use in brushless DC motor applications. This
part can be used to form the power stage of a
three-phase, brushless DC motor control loop,
and is especially useful for disk drive applications.
Power drivers are Integrated DMOS transistors
and feature fast recirculating diodes as an integral
BLOCK DIAGRAM
March 1993
This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
1.5A MAXIMUM PEAK CURRENT
CONTROLLED SLEW RATE
CENTRAL CHARGE PUMP
PWM AND LINEAR MODES
CUTOFF TIME USER CONFIGURABLE
FAST, FREE-WHEELING DIODES ON CHIP
OVER-TEMPERATURE PROTECTION
BRAKE FUNCTION INPUT
part of their structure. The logic inputs are TTL-
level compatible, with internal pull-up, allowing in-
terfacing to open collector outputs. All necessary
circuitry to perform PWM and linear motor speed
control is included. A central charge pump is util-
ized to drive the upper DMOS transistors, and
also to power the braking function. The L6232B is
packaged in PLCC28.
ORDERING NUMBER: L6232B
SPINDLE DRIVER
PLCC21+7
L6232B
ADVANCE DATA
1/10

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L6232B Summary of contents

Page 1

... All necessary circuitry to perform PWM and linear motor speed control is included. A central charge pump is util- ized to drive the upper DMOS transistors, and also to power the braking function. The L6232B is packaged in PLCC28. 1/10 ...

Page 2

... L6232B PIN DESCRIPTION Pin Name GND Common Ground. Also provides heat-sink to PCB SENSE Output for current sense resistors. 6 INLB Logic Input to turn on the lower driver (Active High Supply Voltage INLA Logic input to turn on the lowey driver (Active High). ...

Page 3

... DS See Fig note1 LIN V = 0.4 to 5.5V ref PWM V = 0.4 to 5.5V ref Note 0 (PWM motor I (LIN) = 200mA motor PWM V = 2.5V, ref LIN V = 0.4V, ref R = 0.5 ; Note 2 S L6232B Value Unit -0 -0 3.5 A 1.8 A 1.5 W -40 to 150 C Value Unit Max ...

Page 4

... L6232B ELECTRICAL CHARACTERISTICS (continued) Symbol Parameter G LIN Error Amplifier m Transconductance Zout Error Amplifier Output Impedance V Logic Input Voltage BRK; INUA; INH INUB; INUC; INLA; INLB; INLC V INL I Logic Input Current BRK; INUA; INH(leak) INUB; INUC; INLA; INLB; INLC I INL t Upper/Lower Turn-on Delay ...

Page 5

... Figure 1: Brake Delay and Braking timing of the L6232B. At the time Powerdown threshold detector drives low the BRK input; at time t2 the Charge Pump voltage becomes inadequate to maintain ON the lower DMOS. FUNCTIONAL DESCRIPTION (Refer to the Block Diagram) The commutation sequence is provided by the user via six inputs ...

Page 6

... C3 must be chosen of adeguate quality (very high equivalent parallel resistance). C4 can be a ceramic disk capacitor . The typical applica- tion od the L6232B is in HDD systems on which there is the need to park the Read-Write Heads be- fore the motor braking. This behavior is possible with the circuit of Fig.3. At Power Supply switch-off (see Fig ...

Page 7

... Care must be taken in the PC Board design particularly about ground loops and ground cop- per area. The typical Thermal Resistance junction to ambient versus PC Board copper area (Fig.7) is shown in Fig 8. For Transient Thermal Resis- tance see Fig. 9. vs. Figure 5: Output Voltage Slew Rate Control vs. 1/R Value 2 L6232B 7/10 ...

Page 8

... L6232B Figure 6: Typical Body Diode Forward Drop vs. Drain to Source Current. Figure 8: Typical R vs. On-Board Heatsink th j-amb Side l. 8/10 Figure 7: On Board Dissipation Copper Area Size Figure 9: Typical Transient R in Single Pulse th Condition. ...

Page 9

... PLCC28 PACKAGE MECHANICAL DATA DIM. MIN. A 12.32 B 11.43 D 4.2 D1 2.29 D2 0. TYP. MAX. MIN. 12.57 0.485 11.58 0.450 4.57 0.165 3.04 0.090 0.020 10.92 0.390 1.27 7.62 0.46 0.71 0.101 1.24 1.143 L6232B inch TYP. MAX. 0.495 0.456 0.180 0.120 0.430 0.050 0.300 0.018 0.028 0.004 0.049 0.045 9/10 ...

Page 10

... L6232B Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specifications men- tioned in this publication are subject to change without notice ...

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