L6228QTR STMicroelectronics, L6228QTR Datasheet
L6228QTR
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L6228QTR
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L6228QTR Summary of contents
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Features ■ Operating supply voltage from ■ 2.8 A output peak current (1.4 A RMS) 0.73 Ω typ. value @ ■ R DS(on) ■ Operating frequency up to 100 kHz ■ Non dissipative overcurrent protection ■ ...
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Contents Contents 1 Electrical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...
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L6228Q 1 Electrical data 1.1 Absolute maximum ratings Table 1. Absolute maximum ratings Symbol Parameter V Supply voltage S Differential voltage between OUT1 , OUT2 OUT1 , OUT2 Bootstrap ...
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Electrical data 1.3 Thermal data Table 3. Thermal data Symbol R Thermal resistance junction-ambient max th(JA) 1. Mounted on a double-layer FR4 PCB with a dissipating copper surface of 0 ground layer connected through 18 via holes ...
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L6228Q 2 Pin connection Figure 2. Pin connection (top view) Note: 1 The pins are connected to die PAD. 2 The die PAD must be connected to GND pin. Doc ID 14321 Rev 4 Pin connection 5/32 ...
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Pin connection Table 4. Pin description N° Pin Type 1, 21 GND GND 9 OUT1 Power output Bridge B output pin B 12 SENSE Power supply B 13 VREF Analog input B 14 Logic input ...
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L6228Q 3 Electrical characteristics Table 5. Electrical characteristics (T Symbol Parameter V Turn-on threshold Sth(ON) V Turn-off threshold Sth(OFF) I Quiescent supply current S T Thermal shutdown temperature j(OFF) Output DMOS transistors High-side + low-side switch ON R DS(on) resistance ...
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Electrical characteristics Table 5. Electrical characteristics (continued) (T Symbol Parameter f Clock frequency CLK t Minimum set-up time S(MIN) t Minimum hold time H(MIN) t Minimum reset time R(MIN) t Minimum reset to clock delay time RCLK(MIN) t Dead time ...
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L6228Q Figure 3. Switching characteristic definition EN V th(ON) V th(OFF) I OUT 90% 10% D01IN1316 Figure 4. Clock to output delay time CLOCK I OUT D01IN1317 Figure 5. Minimum timing definition; clock input CLOCK t FALL t D(OFF)EN V ...
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Electrical characteristics Figure 6. Minimum timing definition; logic inputs CLOCK LOGIC INPUTS RESET Figure 7. Overcurrent detection timing definition 10/32 V th(ON) V th(OFF R(MIN) I OUT I SOVER ON BRIDGE OFF V EN 90% 10% t OCD(ON) ...
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L6228Q 4 Circuit description 4.1 Power stages and charge pump The L6228Q integrates two independent power MOS full bridges. Each power MOS has an = 0.73 Ω (typical value @ 25 °C), with intrinsic fast freewheeling diode. Switching R DS(on) ...
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Circuit description 4.2 Logic inputs Pins CONTROL, HALF/FULL, CLOCK, RESET and CW/CCW are TTL/CMOS and microcontroller compatible logic inputs. The internal structure is shown in value for turn-on and turn-off thresholds are respectively V Pin EN (Enable) has identical input ...
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L6228Q 4.3 PWM current control The L6228Q includes a constant off time PWM current controller for each of the two bridges. The current control circuit senses the bridge current by sensing the voltage drop across an external sense resistor connected ...
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Circuit description Figure 13. Output current regulation waveforms I OUT V REF R SENSE V SENSE V REF 2.5V ON SYNCHRONOUS OR QUASI SYNCHRONOUS RECTIFICATION OFF D01IN1334 Figure 14 shows the magnitude of the Off Time ...
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L6228Q t > t ⎧ MIN ⎨ > ⎩ RCRISE t = 600 · C RCRISE Figure 15 shows the lower limit for the on time t capacity. It has to be said that ...
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Circuit description Figure 15. Area where t 4.4 Decay modes The CONTROL input is used to select the behavior of the bridge during the off time. When the CONTROL pin is low, the fast decay mode is selected and both ...
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L6228Q Figure 16. Fast decay mode output stage configurations A) ON TIME Figure 17. Slow decay mode output stage configurations A) ON TIME 4.5 Stepping sequence generation The phase sequence generator is a state machine that provides the phase and ...
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Circuit description 4.7 Normal drive mode (full-step two-phase-on) A LOW level on the HALF/FULL input selects the full step mode. When the low level is applied when the state machine ODD numbered state the normal drive mode ...
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L6228Q Figure 20. Wave drive mode Start Up or Reset 4.9 Non-dissipative overcurrent protection The L6228Q integrates an overcurrent detection circuit (OCD) for full protection. This circuit provides protection against a short circuit to ground or between two phases of ...
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Circuit description Figure 21. Overcurrent protection simplified schematic μC or LOGIC Figure 22 shows the overcurrent detection operation. The disable time t recovering normal operation can be easily programmed by means ...
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L6228Q Figure 22. Overcurrent protection waveforms I OUT I SOVER th(ON) V th(OFF) ON OCD OFF ON BRIDGE OFF t OCD(ON DELAY t t EN(FALL) OCD(OFF) t D(OFF)EN Doc ID 14321 Rev 4 ...
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Circuit description Figure 23. t DISABLE Figure 24. t DELAY 4.10 Thermal protection In addition to the overcurrent ...
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L6228Q 5 Application information A typical bipolar stepper motor driver application using L6228Q is shown in Typical component values for the application are shown in capacitor in the range of 100 to 200 nF should be placed between the power ...
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Application information Figure 25. Typical application Note: To reduce the IC thermal resistance, therefore improve the dissipation path, the NC pins can be connected to GND. 24/32 Doc ID 14321 Rev 4 L6228Q ...
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L6228Q 6 Output current capability and IC power dissipation In Figure 26, Figure between the output current and the IC power dissipation using PWM current control driving a two-phase stepper motor, for different driving sequences: ● HALF STEP mode energized. ...
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Output current capability and IC power dissipation Figure 27. IC power dissipation versus output current in NORMAL mode (full step two phase on Figure 28. IC power dissipation versus ...
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L6228Q 7 Thermal management In most applications the power dissipation in the IC is the main factor that sets the maximum current that can be delivered by the device in a safe operating condition. Therefore, it has to be taken ...
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Package mechanical data 8 Package 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: ...
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L6228Q Figure 30. Package dimensions Doc ID 14321 Rev 4 Package mechanical data 29/32 ...
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... Order codes 9 Order codes Table 9. Ordering information Order code L6228Q L6228QTR 30/32 Package VFQFPN32 5x5x1.0 mm Doc ID 14321 Rev 4 L6228Q Packaging Tube Tape and reel ...
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L6228Q 10 Revision history Table 10. Document revision history Date 14-Jan-2008 10-Jun-2008 28-Jan-2009 31-Aug-2010 Revision 1 First release Updated: Figure 25 on page 24 2 Added: Note 1 on page 4 3 Updated value in Table 3: Thermal data on ...
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