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November 2011 Doc ID 1107 Rev 10 1/16

L6234

Three phase motor driver

Features

■ Supply voltage from 7 to 52 V

■ 5 A peak current

■ R

DSon

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

Order code Package Packing

L6234 PowerDIP20 Tube

L6234PD PowerSO20 Tube

L6234PD013TR PowerSO20 Tape and reel

www.st.com

Summary of content (16 pages)

PAGE 1
L6234 Three phase motor driver 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 32:(5 ',3 3RZHU62 Description The L6234 is a triple half bridge to drive a brushless DC motor.
PAGE 2
Contents L6234 Contents 1 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Pin connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 4.1 Recommended operating conditions .
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L6234 1 Block diagram Block diagram Figure 1.
PAGE 4
Pin connections 2 L6234 Pin connections Figure 2. Pin connections *1' *1' 6(16( 6(16( (1 9%227 ,1 9&3 *1' 287 95() 287 287 287 287 ,1 ,1 (1 (1 96 *1' 6(16( *1' *1' 96 6(16( (1 ,1 287 9%227 ,1 ,1 (1 (1 96 96 *1' 9&3 *1' 95() 32:(5 ',3 3RZHU62 !- V Table 2.
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L6234 3 Thermal data Thermal data Table 3. Symbol Rth j-pin Thermal data Parameter Thermal resistance, junction to pin Rth j-amb1 Thermal resistance, junction to ambient Rth j-amb2 Thermal resistance, junction characteristics) to ambient Rth j-case Thermal resistance junction-case DIP16+2+2 PowerSO20 Unit 12 (1) – °C/W (2) – °C/W 50 (3) – °C/W – 1.5 °C/W 40 1.
PAGE 6
Maximum ratings 4 L6234 Maximum ratings Table 4. Absolute maximum ratings Symbol Parameter VS Power supply voltage VIN, VEN Input enable voltage Ipeak VSENSE Pulsed output current (1) Sensing voltage (DC voltage) Value Unit 52 V – 0.3 to 7 V 5 A -1 to 4 V Vboot Bootstrap peak voltage 62 V VOD Differential output voltage (between any of the 3 OUT pins) 60 V Commutation frequency 150 kHz Reference voltage 12 V 2.
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L6234 5 Electrical characteristics Electrical characteristics VS = 42 V; Tj = 25 °C unless otherwise specified. Table 6. Electrical characteristics Symbol Parameter Test condition Min. Typ. Max. Unit 52 V VS Supply voltage Vref Reference voltage 10 V IS Quiescent supply current 6.5 mA TS Thermal shutdown TD Dead time protection 7 150 °C 300 ns Output dmos transistor IDSS RDSon Leakage current 1 ON resistance mA 0.
PAGE 8
Circuit description 6 L6234 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.
PAGE 9
L6234 Typical characteristics 7 Typical characteristics Figure 4. Quiescent current vs. supply voltage Figure 5. Normalized quiescent current vs. switching frequency ,T > P $ @ ,T ,T# +] 7M & 7 M & 7M & 7 M & 7M & 7 M & 7 M & 9 V >9 @ IVZ >N+]@ !- V Figure 6. Typical RDSon vs. supply voltage !- V Figure 7.
PAGE 10
Typical characteristics Figure 8. L6234 Typical diode forward ON characteristics Figure 9. ,6 ' > $ @ 9UHI >9 @ Reference voltage vs. supply voltage 7 M & '0 2 6 2 1 '0 2 6 2)) 7 M & 9 6 ' >9 @ !- V Figure 10. Reference voltage vs. junction temperature 9 V >9 @ !- V Figure 11.
PAGE 11
L6234 Typical characteristics Figure 12. PowerSO-20 thermal resistance Figure 13. PowerSO-20 thermal resistance (mounted on Aluminium substrate) (mounted on FR4 monolayer substrate) !- V !- V Figure 14. PowerSO-20: with external heatsink Figure 15.
PAGE 12
Mechanical data 8 L6234 Mechanical data In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK® packages, depending on their level of environmental compliance. ECOPACK® specifications, grade definitions and product status are available at: www.st.com. ECOPACK® is an ST trademark. Table 7. PowerSO20 mechanical data mm Dim. Min. Typ. A a1 3.6 0.1 0.3 a2 3.3 a3 0 0.1 b 0.4 0.53 c 0.23 0.32 D (1) 15.8 16 D1 9.4 9.8 E 13.9 14.5 e 1.
PAGE 13
L6234 Mechanical data Figure 16.
PAGE 14
Mechanical data L6234 Table 8. PowerDIP20 mechanical data mm Dim. Min. a1 0.51 B 0.85 b b1 Typ. 1.40 0.50 0.38 0.50 D 24.80 E 8.80 e 2.54 e3 22.86 F 7.10 I 5.10 L 3.30 Z 1.27 Figure 17. PowerDIP20 mechanical drawing 14/16 Max.
PAGE 15
L6234 9 Revision history Revision history Table 9.
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L6234 Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale.