L9639 FOLDER ACTUATOR BIDIRECTIONAL SWITCH MOTOR STOP CONTROLLED BY MOTOR CURRENT START UP AND END CURRENT DETECTION THRESHOLDS PROGRAMMABLE WITH EXTERNAL RSHUNT STOP DELAY TIME FOR START UP AND END PHASE PROGRAMMABLE WITH EXTERNAL RC OUTPUT SHORT CIRCUIT PROTECTION OUTPUT CURRENT LIMITING > 8A THERMAL PROTECTION ACTIVE DIODE BRIDGE INTERNALLY DIFFUSED MAXIMUM VOLTAGE SUPPLY 50V PowerSO20 TECHNOLOGY MULTIPOWER BCD60II BLOCK DIAGRAM COMMON 19 GND 1,10,11,20 LIVE 2 V+ 14 OPEN LOAD DETECTOR POWER DUAL DMOS CHARGE PUMP ACTIVE BRIDGE POW ER ON RESET LOGIC HV REF. VOLTAGE CURRENT PROTECT. CHARGE CEX. CONTROL LOGIC LV COMP. THERMAL PROTEC T. 6 8 RCEX November 1998 16 17 VREF REF. COMP. CURRENT 5 3 4 SHUNT 1/6 L9639 ABSOLUTE MAXIMUM RATINGS Symbol Parameter Value Unit V bat Supply Voltage 50 V Iout Output current DC at Is 5 6 A A Top Operating Temperature -40 to 125 °C Value Unit 4 °C/W PIN CONNECTION GND 1 20 GND LIVE 2 19 COMMON SHUNT 3 18 NC SHUNT 4 17 OUT SHUNT 5 16 OUT VREF 6 15 NC NC 7 14 V+ RCEX 8 13 NC NC 9 12 NC 10 11 GND GND THERMAL DATA 2/6 Symbol Parameter Rth j-case Thermal Resistance Junction to case Max. L9639 ELECTRICAL CHARACTERISTICS (Refer to the test circuit, unless otherwise specified.) Symbol Vbat Parameter Test Condition Power supply Min. Typ. Max. 17 V 100 200 µA 8 Unit Iq Quiescent current Stanby Iref Current ref. threshold for start and end current (note 1) Vbat = 8 to 17V 70 100 135 µA Irefcc Current ref. threshold for short circuit current det (note 2) Vbat = 8V Vbat = 12V Vbat = 17V 240 300 400 300 440 550 400 560 690 µA 100 µs Ohm Isc1 Current short circuit limit Tdsc Short circuit time delay Iload > Ithcc Ron Ron output power DMOS Iload = 1.2A R ona Ron active bridge DMOS Vbat = 8V, Ignd = 1A Rload Open load detector max. load resistance K td Delay constant (note 3) Deb Immunity debouncer switch 8 A 0.6 1 0.7 Ohm 200 Ohm 1 Vbat = pulse R_ref Iref Rshunt R_ref Note 2: Ithcc = ⋅ Irefcc Rshunt Vth_high Note 3: Td = In ⋅ Rex ⋅ Cex = Rex ⋅ Cex ⋅ Ktd Vth_low Note 1: Ith = DESCRIPTION This device typically drives a direct current motor servomechanism providing two extreme end positions and replaces end position switches or sensors. For more details see the Timing diagram (Fig. 1) and the Application diagram (Fig. 2) When the power supply is applied, or its polarity is inverted the motor is powered up (start point). The current of the motor reaches the start up value near to the stall current, always higher than the threshold value of the device (ITH) . A delay on the detection (TD) permits the motor start up and the consequent decrease of the current. During the free running phase, the current in the motor must always be lower the threshold ITH. When the motor reaches the end of the run limit, the current increases reaching a value that, depending on the application, can be the stall value or can depend on some torque limiting friction (end point). Provided that this value is higher the programmed threshold I TH , the motor is stopped after a time delay TD, and the device goes into a low consumption standby status, ready to restart the motor for a new cycle if the polarity of the power supply is inverted (or power is switched off and on). In any case, if the current exceeds the higher threshold I THCC, the motor is immediately stopped because a short circuit is detected. The delay TD also permits the motor to overcome some small obstacle during the free run. The threshold current for the running phase ITH is obtained by comparing the voltage on an external sensing resistor (RSHUNT) to a threshold voltage VTH. 1) ITH = VTH / RSHUNT VTH is constant in respect to the power supply voltage because in most applications, the end of run current is depending only on motor and the mechanic torque limiting device (friction current). The threshold current for the short circuit detection is: 2) ITHCC = VTHCC/RSHUNT @ VTHCC = 330mV @ Vbat = 12V and depends intentionally on the supply voltage because of the same dependence of the stall current. The time TD depends on two external components, capacitor CEX and resistor REX. TD is obtained by the following expression : TD = REX ⋅ REX ⋅ KTD KTD is a constant typically of unit value. The block diagram is shown on the first page. The change of the polarity between pins COMMON and LIVE, needs the active bridge to supply the internal circuit. The internal supply voltage is available between pins V+ and GND and a storage and filter capacitor (100nF) must be connected between these pins. The output stage 3/6 L9639 consists of two DMOS transistors connected in series with common drain to act as a switch with the voltage applied in both direction. A charge pump takes the gates of the DMOS above the supply voltage. The motor is controlled by the control ’logic low voltage’ block that receives the motor status for the comparator. The ’charge CEX’ block controls the TD delay. Figure 1. Functional timing diagram. ITHCC 3 2 1 STALL CURRENT 2.3A FRICTION 1.2A ITH VTH_HIGH VTH_LOW Figure 2. Application schematic diagram. R_SHUNT R_REF R_EX C_EX GND GND LIVE COMMON SHUNT NC SHUNT OUT SHUNT OUT VREF NC NC V+ RCEX NC NC NC GND M C+ GND All the necessary external components are shown in the application diagram. It is important to shunt the motor with a device that limits the maximum over voltage to 40V. This is necessary when the power supply circuit is opened on motor power up. In this case the back E.M.F. must be clamped because there is no other free wheel current path. 4/6 L9639 DIM. A a1 a2 a3 b c D (1) D1 E e e3 E1 (1) E2 E3 G H h L N S T MIN. mm TYP. 0.1 0 0.4 0.23 15.8 9.4 13.9 MAX. 3.6 0.3 3.3 0.1 0.53 0.32 16 9.8 14.5 MIN. 0.004 0.000 0.016 0.009 0.622 0.370 0.547 1.27 11.43 10.9 inch TYP. 0.050 0.450 11.1 0.429 2.9 6.2 0.228 0.1 0.000 15.9 0.610 1.1 1.1 0.031 10° (max.) 8° (max.) 5.8 0 15.5 0.8 OUTLINE AND MECHANICAL DATA MAX. 0.142 0.012 0.130 0.004 0.021 0.013 0.630 0.386 0.570 10 0.437 0.114 0.244 0.004 0.626 0.043 0.043 JEDEC MO-166 0.394 PowerSO20 (1) ”D and F” do not include mold flash or protrusions. - Mold flash or protrusions shall not exceed 0.15 mm (0.006”). - Critical dimensions: ”E”, ”G” and ”a3” N R N a2 b A e DETAIL A c a1 DETAIL B E e3 H DETAIL A lead D slug a3 DETAIL B 20 11 0.35 Gage Plane - C- S SEATING PLANE L G E2 E1 BOTTOM VIEW C (COPLANARITY) T E3 1 h x 45 10 PSO20MEC D1 5/6 L9639 Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specification mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. 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