L6234PD013TR STMICROELECTRONICS | Alldatasheet
Document overview
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- PDF pages: 16
Technical content
Datasheet sections
- 1 Block diagram
- 2 Pin connections
- 3 Thermal data
- 4 Maximum ratings
- 4.1 Recommended operating conditions
- 5 Electrical characteristics
- 6 Circuit description
- 7 Typical characteristics
- 8 Mechanical data
- 9 Revision history
Features
■ Supply voltage from 7 to 52 V ■ 5 A peak current ■ RDSon 0.3 Ω typ. value at 25 °C ■ Cross conduction protection ■ TTL compatible driver ■ Operating frequency up to 150 kHz ■ Thermal shutdown ■ Intrinsic fast free wheeling diodes ■ Input and enable function for each half bridge ■ 10 V external reference available
Description
The L6234 is a triple half bridge to drive a brushless DC motor. It is realized in BCDmultipower technology which combines isolated DMOS power transistors with CMOS and Bipolar circuits on the same chip. By using mixed technology it has been possible to optimize the logic circuitry and the power stage to achieve the best possible performance. The output DMOS transistors can sustain a very high current due to the fact that the DMOS structure is not affected by the second breakdown effect, the RMS maximum current is practically limited by the dissipation capability of the package. All the logic inputs are TTL, CMOS and µP compatible. Each channel is controlled by two separate logic input. L6234 is available in 20 pin PowerDIP package (16+2+2) and in PowerSO20. 3RZHU62 32:(5',3 Table 1. Device summary
1 Block diagram
Figure 1. Block diagram
2 Pin connections
Figure 2. Pin connections Table 2. Pin functions Output of the channels 1/2/3. corresponding low side DMOS Power. switches off both power DMOS of the related channel. motor current control for the bridge 3. motor current control for the bridges 1 and 2. these pins are used to dissipate the heat forward the PCB.
3 Thermal data
Figure 3. Printed Heatsink Table 3. Thermal data
- The thermal resistance is referred to the thermal pat h from the dissipating region on the top surface of the
- If a dissipating surface, thick at least 35 mm, and wi th a surface similar or bigger than the one shown in
side of an horizontal PCB (worst case).
- If the power dissipating pins (the four central ones ), as well as the others, have a minimum thermal
4 Maximum ratings
4.1 Recommended operating conditions
Table 4. Absolute maximum ratings
- Pulse width limited only by junction tem perature and the transient thermal impedance
- Mounted on board with minimized copper area
Table 5. Recommended operating conditions
5 Electrical characteristics
VS = 42 V; Tj = 25 °C unless otherwise specified. Table 6. Electrical characteristics
6 Circuit description
L6234 is a triple half bridge designed to drive brushless DC motors. Each half bridge has 2 power DMOS transistors with RDSon = 0.3 Ω. The 3 half bridges can be controlled independently by means of the 3 inputs IN1, IN2, IN3 and the 3 inputs EN1, EN2, and EN3. An external connection to the 3 common low side DMOS sources is provided to connect a sensing resistor for constant current chopping application. The driving stage and the logic stage are designed to work from 7 V to 52 V.
7 Typical characteristics
Figure 4. Quiescent current vs. supply Figure 5. Normalized quiescent current vs. Figure 6. Typical R DSon vs. supply voltage Figure 7. Source drain forward on voltage vs.
8 Mechanical data
specifications, grade definitions and product status are available at: www.st.com. ECOPACK® is an ST trademark. Table 7. PowerSO20 mechanical data
Figure 16. PowerSO20 mechanical drawing
Figure 17. PowerDIP20 mechanical drawing Table 8. PowerDIP20 mechanical data
9 Revision history
Table 9. Document revision history