L6208Q STMicroelectronics, L6208Q Datasheet
L6208Q
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L6208Q Summary of contents
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... T J Description PWM current OFF The L6208Q is a DMOS fully integrated stepper motor driver with non-dissipative overcurrent protection, realized in MultiPower-BCD technology, which combines isolated DMOS Power Transistors with CMOS and bipolar circuits on the same chip. The device includes all the ...
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... Wave drive mode (full-step one-phase-on 4.9 Non-dissipative overcurrent detection and protection . . . . . . . . . . . . . . . 18 4.10 Thermal protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 5 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 6 Output current capability and IC power dissipation . . . . . . . . . . . . . . 24 7 Thermal management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 8 Electrical characteristics curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 9 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 10 Order codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 11 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 2/33 Doc ID 018710 Rev 1 L6208Q ...
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... 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 enable voltage range REFA Voltage range at pins V V REFB V , RCA Voltage range at pins RC ...
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... RC network pin. A parallel RC network connected between this pin RC pin and ground sets the current controller OFF-time of the bridge B. Doc ID 018710 Rev VSA 35 VSA GND VSB VSB Function L6208Q AM02556v1 ...
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... 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 B 34 Power supply A 26 Power supply B 38, 39 ...
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... EN = LOW 2.5A GND logic input voltage 7V logic input voltage (2) I =2.5A, resistive load LOAD (2) I =2.5A, resistive load LOAD I =2.5A, resistive load LOAD I =2.5A, resistive load LOAD (3) I =2.5A, resistive load LOAD Doc ID 018710 Rev 1 L6208Q Min Typ Max Unit 6.6 7 7.4 V 5 165 °C 0.34 0.4 0.53 0.59 Ω 0.28 ...
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... 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 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 protection DT f Charge pump frequency ...
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... 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 D(OFF)EN V th(ON) V th(ON) V th(OFF) t CLK(MIN)L Doc ID 018710 Rev 1 L6208Q RISE t D(ON) DCLK V th(OFF) t D01IN1318 CLK(MIN)H AM02557v1 ...
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... 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 Rev 1 Electrical characteristics V th(ON S(MIN) H(MIN) D01IN1319 t RCLK(MIN) t OCD(OFF) AM02558v1 9/33 ...
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... Circuit description 4 Circuit description 4.1 Power stages and charge pump The L6208Q integrates two independent power MOS full bridges, each power MOS has an = 0.3 Ω (typical value @ 25 °C) with intrinsic fast freewheeling diode. Cross R DS(ON) conduction protection is implemented by using a dead time (t internal timing circuit between the turn off and turn on of two power MOSFETs in one leg of a bridge ...
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... 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 and turn-off thresholds are respectively V Pin EN (Enable) has identical input structure with the exception that the drain of the Overcurrent and thermal protection MOSFET is also connected to this pin. Due to this connection some care needs to be taken in driving this pin ...
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... 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 connected between the source of the two lower power MOS transistors and ground, as shown in voltage across the sense resistor increases proportionally ...
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... 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 approximately calculated from the equations 0.6 · R RCFALL OFF RCFALL where R and C OFF dead time with: 20 kΩ ...
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... R off = 20kΩ R off 100 10 1 0.1 1 Coff [nF] Doc ID 018710 Rev 1.5μs typ = ⋅ OFF for having a good PWM current regulation because the device ON(MIN this last case the device RCRISE DT , the more OFF = 100kΩ R off 10 100 L6208Q ...
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... 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 1 Circuit description 15/33 ...
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... Figure 17. Slow decay mode output stage configurations ) 16/33 μs DEAD TIME ) B 1 D01IN1335 μs DEAD TIME ) B 1 D01IN1336 Doc ID 018710 Rev 1 C) QUASI-SYNCHRONOUS D) 1μs SLOW DECAY RECTIFICATION C) SYNCHRONOUS D) 1μs DEAD TIME RECTIFICATION L6208Q ...
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... 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 are possible, the Normal Drive Mode where both phases are energized each step and the Wave Drive Mode where only one phase is energized at a time ...
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... CLOCK Start Up or Reset 1 D01IN1322 I OUTA OUTB CLOCK 2 Start Up or Reset D01IN1321 Figure 21 shows a simplified schematic of the overcurrent Doc ID 018710 Rev When the REF L6208Q ...
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... 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 the accurate thresholds of the logic inputs affected whether by C magnitude is reported in an overcurrent has been detected depends only by C Figure 24 ...
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... Doc ID 018710 Rev 1 V EN(LOW) t DISABLE t t EN(RISE) D(ON) Ω Ω Ω Ω Ω Ω Ω Ω L6208Q AM02564v1 ...
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... DELAY 4.10 Thermal protection In addition to the overcurrent detection, the L6208Q integrates a thermal protection for preventing the device destruction in case of junction over temperature. It works sensing the die temperature by means of a sensible element integrated in the die. The device switch-off when the junction temperature reaches 165 °C (typ. value) with 15 °C hysteresis (typ. ...
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... 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 transients generated by the switching. The capacitors connected from the EN input to ground sets the shut down time when an over current is detected (see overcurrent protection) ...
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... L6208Q Figure 25. Typical application + 8-52V DC POWER GROUND - SIGNAL GROUND Note: To reduce the IC thermal resistance, therefore improve the dissipation path, the NC pins can be connected to GND 34 26 VCP BOOT VBOOT 21 R SENSE SENSEA ...
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... HALF STEP 0.5 1 1 [A] OUT Doc ID 018710 Rev 1 L6208Q (Figure 27) in which two (Figure 28) in which only one I OUT I OUT Test Conditions: Supply Voltage = 24V No PWM kHz (slow decay) SW AM02570v1 ...
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... L6208Q Figure 27. IC power dissipation versus output current in normal mode (full step two phase on Figure 28. IC power dissipation versus output current in wave mode (full step one phase on [ Figure 29. IC power dissipation versus output current in micro stepping mode ...
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... Therefore, it has to be taken into account very carefully. Besides the available space on the PCB, the right package should be chosen considering the power dissipation. Heat sinking can be achieved using copper on the PCB with proper area and thickness. 26/33 Doc ID 018710 Rev 1 L6208Q ...
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... L6208Q 8 Electrical characteristics 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. switching frequency kHz) 1.7 1.6 1.5 1.4 1.3 1.2 1.1 1.0 0 [kHz] SW Figure 31. Typical high-side R R [Ω] DS(ON) 0.380 T = 25°C j 0.376 T = 85°C j 0.372 ...
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... 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 [A] SD 3.0 2.5 2.0 1.5 1.0 0.5 0 700 [V] AM02576v1 Doc ID 018710 Rev 1 ON characteristic T = 25°C j 800 900 1000 1100 1200 V [mV] SD L6208Q 1300 AM02577v1 ...
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... 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. ECOPACK® trademark. Table 7. VFQFPN48 ( 1.0 mm) package mechanical data Dim ...
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... Package mechanical data Figure 36. VFQFPN48 ( 1.0 mm) package outline 30/33 Doc ID 018710 Rev 1 L6208Q ...
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... L6208Q 10 Order codes Table 8. Ordering information Order codes L6208Q L6208QTR Package QFN48 1.0 mm Doc ID 018710 Rev 1 Order codes Packaging Tray Tape and reel 31/33 ...
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... Revision history 11 Revision history Table 9. Document revision history Date 29-Jul-2011 32/33 Revision 1 First release Doc ID 018710 Rev 1 L6208Q Changes ...
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... 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. ...