L6208QTR STMicroelectronics, L6208QTR Datasheet
L6208QTR
Specifications of L6208QTR
Related parts for L6208QTR
L6208QTR Summary of contents
Page 1
Features ■ Operating supply voltage from ■ 5.6 A output peak current 0.3 Ω typ. value @ ■ R DS(on) ■ Operating frequency up to 100 kHz ■ Non-dissipative overcurrent protection ■ Dual independent constant t ...
Page 2
Contents Contents 1 Electrical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...
Page 3
L6208Q 1 Electrical data 1.1 Absolute maximum ratings Table 1. Absolute maximum ratings Symbol V Supply voltage S Differential voltage between OUT1 OUT1 B V Bootstrap peak voltage BOOT V ,V Input and ...
Page 4
Pin connection 2 Pin connection Figure 2. Pin connection (top view) Note: The exposed PAD must be connected to GND pin. Table 3. Pin description Pin Name 43 CLOCK Logic input 44 CW/CCW Logic input 45, 46 SENSE Power supply ...
Page 5
L6208Q Table 3. Pin description (continued) Pin Name 15, 16 SENSE Power supply B 17 VREF Analog input B 18 HALF/FULL Logic input 19 CONTROL Logic input 20 EN Logic input 21 VBOOT Supply voltage 22, 23 OUT2 Power output ...
Page 6
Electrical characteristics 3 Electrical characteristics °C, unless otherwise specified Table 4. Electrical characteristics Symbol Parameter V Turn-on threshold Sth(ON) V Turn-off threshold Sth(OFF) I Quiescent supply current S T Thermal shutdown ...
Page 7
L6208Q Table 4. Electrical characteristics (continued) Symbol Parameter t Minimum clock time CLK(min)L t Minimum clock time CLK(min Clock frequency CLK t Minimum setup time S(MIN) t Minimum hold time H(MIN) t Minimum reset time R(MIN) t Minimum ...
Page 8
Electrical characteristics 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 8/33 t FALL t ...
Page 9
L6208Q Figure 6. Minimum timing definition; logic inputs CLOCK LOGIC INPUTS RESET Figure 7. Overcurrent detection timing definition V th(ON) V th(OFF) t R(MIN) I OUT I SOVER ON BRIDGE OFF V EN 90% 10% t OCD(ON) Doc ID 018710 ...
Page 10
Circuit description 4 Circuit description 4.1 Power stages and charge pump The L6208Q integrates two independent power MOSFET full bridges, each power MOSFET = 0.3 Ω (typical value @ 25 °C) with intrinsic fast freewheeling diode. Cross has an R ...
Page 11
L6208Q 4.2 Logic inputs Pins CONTROL, HALF/FULL, CLOCK, RESET and CW/CCW are TTL/CMOS and µC compatible logic inputs. The internal structure is shown in on and turn-off thresholds are respectively V Pin EN (Enable) has identical input structure with the ...
Page 12
Circuit description 4.3 PWM current control The L6208Q 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 ...
Page 13
L6208Q 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 t ...
Page 14
Circuit description Figure 15 shows the lower limit for the ON time t regulation capacity. It should be mentioned that t the device imposes this condition, but it can be smaller than t the device continues to work but the ...
Page 15
L6208Q Figure 15. Area where t can vary maintaining the PWM regulation ON 100 10 1.5μs (typ. value Coff [nF] Doc ID 018710 Rev 2 Circuit description 15/33 ...
Page 16
Circuit description 4.4 Decay mode 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 transistors in the bridge are ...
Page 17
L6208Q 4.5 Stepping sequence generation The phase sequence generator is a state machine that provides the phase and enable inputs for the two bridges to drive a stepper motor in either full step or half step. Two full step modes ...
Page 18
Circuit description Figure 18. Half step mode Figure 19. Normal drive mode Figure 20. Wave drive mode 4.9 Non-dissipative overcurrent detection and protection The L6208 integrates an overcurrent detection circuit (OCD). With this internal overcurrent detection, the external current sense ...
Page 19
L6208Q 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 of ...
Page 20
Circuit description Figure 22. Overcurrent protection waveforms I OUT I SOVER th(ON) V th(OFF) ON OCD OFF ON BRIDGE OFF t OCD(ON) Figure 23. t DISABLE ...
Page 21
L6208Q Figure 24. t DELAY 4.10 Thermal protection In addition to the overcurrent detection, the L6208Q integrates a thermal protection to prevent device destruction in the case of junction over temperature. It works sensing the die temperature by means of ...
Page 22
Application information 5 Application information A typical application using L6208Q is shown in application are shown in nF should be placed between the power pins (VS to improve the high frequency filtering on the power supply and reduce high frequency ...
Page 23
L6208Q Figure 25. Typical application + 8-52V DC POWER GROUND - SIGNAL GROUND Note: To reduce the IC thermal resistance, therefore improving the dissipation path, the NC pins can be connected to GND. VS ...
Page 24
Output current capability and IC power dissipation 6 Output current capability and IC power dissipation Figure 26, 27 power dissipation using PWM current control driving a two-phase stepper motor, for different driving sequences: ● HALF STEP mode energized. ...
Page 25
L6208Q Figure 27. IC power dissipation vs. output current in normal mode (full step two- phase-on Figure 28. IC power dissipation vs. output current in wave mode (full step ...
Page 26
Thermal management 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 must be considered ...
Page 27
L6208Q 8 Electrical characteristic curves Figure 30. Typical quiescent current vs. supply voltage 5 1kHz sw 5.4 5.2 5.0 4.8 4 [V] S Figure 32. Normalized typical quiescent current vs. ...
Page 28
Electrical characteristic curves Figure 34. Typical low-side R voltage R [Ω] DS(ON) 0.300 0.296 T = 25°C j 0.292 0.288 0.284 0.280 0.276 28/33 vs. supply Figure 35. Typical drain-source diode forward DS(on) I ...
Page 29
L6208Q 9 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: www.st.com. ...
Page 30
Package mechanical data Figure 36. VFQFPN48 ( 1.0 mm) package outline 30/33 Doc ID 018710 Rev 2 L6208Q ...
Page 31
... L6208Q 10 Order codes Table 8. Ordering information Order codes L6208Q L6208QTR Package QFN48 1.0 mm Doc ID 018710 Rev 2 Order codes Packaging Tray Tape and reel 31/33 ...
Page 32
Revision history 11 Revision history Table 9. Document revision history Date 29-Jul-2011 28-Nov-2011 32/33 Revision 1 First release 2 Document moved from preliminary to final datasheet Doc ID 018710 Rev 2 L6208Q Changes ...
Page 33
... L6208Q 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. ...