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| L9907N MOTOR BRIDGE FOR HEADLIGHT ADJUSTMENT FULL BRIDGE OUTPUT CONFIGURATION WITH LOW SATURATION VOLTAGE LESS THAN 3.2V AT OUTPUT CURRENT 0.7A OPERATING SUPPLY VOLTAGE RANGE 7V TO 18V. SUPPLY OVERVOLTAGEUP TO 50V HIGH POSITIONING PRECISION AND HIGH NOISE IMMUNITY DUE TO TRANSFER CHARACTERISTICS WITH NEUTRAL ZONE AND STOP RANGE THRESHOLD FAST STOP THROUGH SHORT-CIRCUITING THE MOTOR MOTOR STOP STATUS IN CASE OF OPEN INPUT CONDITION SUPPLY OVERVOLTAGE PROTECTION FUNCTION FOR Vs MORE THAN 18V, UP TO 50V INPUT PROTECTION AGAINST TRANSIENTS ON THE BATTERY LINE AND THE REVERSE BATTERY CONDITION THERMAL OVERLOAD PROTECTION ESD PROTECTED ACCORDING TO MIL883C BLOCK DIAGRAM SO20L(12+4+4) ORDERING NUMBER: L9907ND (SO20L) DESCRIPTION The L9907N is a monolithic integrated power comparator with full bridge output configuration, intended for driving DC motors in positioning systems, optimized for headlight adjustment application and respecting the automotive electronics environmental conditions. VS PR RPR INC VINC IINC VS = 1.2V REFERENCE BIAS PROTECTION FUNCTIONS = + OUT C = = = + INF VINF IINF IM OUT F M = = 1.2V L9907N D95AT189 GND December 1996 1/8 L9907N ABSOLUTE MAXIMUM RATINGS Symbol V SDC VSP IOUT_DC IOUT_P IIN IIN Ts DC Supply Voltage Supply Voltage Pulse (T 400ms) DC Output Current Output Current Pulsed (100ms) DC Input Current Input Current Pulse (2ms) Storage Shutdown Junction Temperature Range (*) Parameter Value 26 50 0.4 0.8 10 40 150 Unit V V A A mA mA C (*) Recommended maximal Tamb 105C PIN CONNECTION VS OUTC N.C. GND GND GND GND N.C. INC PR 1 2 3 4 5 6 7 8 9 10 D95AT181 20 19 18 17 16 15 14 13 12 11 N.C. OUTF N.C. GND GND GND GND N.C. INF N.C. THERMAL DATA Symbol Rth j-amb Rth j-pins 2 Parameter Thermal Resistance Junction-ambient (1) Thermal Resistance Junction-pins SO20L 50 15 Unit C/W C/W (1) with 6cm on board heat sink area 2/8 L9907N ELECTRICAL CHARACTERISTICS (7V < VS < 18V, -40C < Tj < 150C; unless otherwise specified.) Symbol Iq Parameter Quiescent Current Test Condition IOUT = 0, (Output Open) |Vdin| < 20mV (stop) |Vdin| < 200mV (L or R) (2) Min. Typ. 7 6 Max. 9 7 4x VST 4 x VST 60 100 1.5 1.5 VS-2 VS-1.5 VS-1.4 Unit mA mA mV mV -VN-, VN+ Neutral Zone Threshold 1.5 < VINC < VS -2V; VS = 12V R PR = R PR = 0 1.5 < VINC < VS -2V; VS = 12V R PR = R PR = 0 Tj = -40 to +25C Tj = >25C Outputs = ON with RINC = 0 with R INC = 5K with R INC = 10K Outputs = OFF with R INC = 0 with R INC = 5K with R INC = 10K 1.5 < VINC < VS -2V; VS = 12V Vdin = 0; R PR = Vdin = 200mV; RPR = Vdin = 0; R PR = 0 Vdin = 200mV; RPR = 0 IOUT IOUT IOUT IOUT = 0.7A = 0.35A = 0.7A = 0.35A 3 x VST 3 x VST 120 240 -VST- ,VST+ Stop Range Threshold VINCL VINCH VCH (3) Control Input LOW Disable Threshold Control Input HIGH Disable Threshold (4) 25 50 0.8 0.6 38 76 1.2 1.2 mV mV V V V V V V V V VS-0.8 VS-0.6 VS-0.4 0.45 0.9 0.8 1.5 1.1 0.8 1.2 0.9 2.0 4.0 3.6 6.8 1.4 1.1 2 1.5 IIN Input Bias Current VOSI VOSO Output Saturation Voltage Sink Stage Output Saturation Voltage Source Stage A A A A V V V V (2) With a programming resistor RPR between the PR pin and GND the N+ and N- thresholds can be adjusted from the nominal value (RPR = , pin PR open) up to two times the nominal value (RPR = 0, pin PR shorted to GND). RPR 1+ 9.5K The formula defining VN+, VN- typical value as a function of RPR and VS is: -V N- = VN+ = (36mV + 0.017 VS) . RPR 1+2 9.5K for RPR = this formula reduced to: -VN+ (RPR = ) = VN+ (RPR = ) = 18mV + 0.0086 VS. for Vs in V and RPR in K these formulas result in mV (3) VCH is the control input voltage applied to the pin INC through a serial resistor RINC (4) OUTPUTS = UNDEFINED for: VS -2V < VCH (RINC = 0) < VS -0.8V V S -1.5V < VCH (RINC = 5K) < VS -0.6V V S -1.4V < VCH (RINC = 10K) < VS -0.4V Figure 1: L9907N Differential Input to Output Transfer Characteristics VM =VOUTC -VOUTF VNMOTOR DIRECTION RIGHT VN+ VH+ MOTOR DIRECTION LEFT VINC -VINF NEUTRALZONE VHD95AT182 STOP RANGE 3/8 L9907N FUNCTIONAL DESCRIPTION The L9907N is a power comparator with fullbridge push-pull outputs, intended for driving a DC motor in the headling adjustment system. The basic function of the device is shown in the input-output tranfer characteristic, Fig. 1. For differential input voltage (VINC - VINF) lower than the negative NEUTRAL ZONE threshold, VNthe output voltage is negative (corresponds to motor direction right), for increasing differential input voltage, this status changes to the zero output voltage (motor is actively braked), when the differential input voltage exceeds the VST- stop range threshold. The output status remains in this condition as long as the differential input voltage remains within the NEUTRAL ZONE. If the input voltage increases above the positive NEUTRAL ZONE threshold VN+, the output voltage become positive (motor direction left). Similar behaviour is obtained for decreasing the input voltage. The output status transitions are marked with the arrows showing the corresponding direction of the output status variation. The active braking mode is got with both outputs in "HIGH" status The above described behaviour assures high positioning precision, corresponding to the STOP RANGE and high noise immunity in the adjusted condition due to the NEUTRAL ZONE hysteresis thresholds . Both the above described thresholds are defined referring to INC, INF pins. The error due to voltage drop over the input signal source resistances RINC, RINF is minimized with extremely low input bias currents I INC, IINF. The above mentioned resistors (RINC, RINF) are necessary for the input current limitation during the transients on the VBAT line. The input source resistors must be dimensioned so that in case of a line transient the input current in the input pin, clamped with the internal input protection diodes do not increase over the specified absolute maximum value. Figure 2: Control to feedbacktransfer characteristic for tracking regulation (VF = VC within the nominal VINC operating range): VBAT D95AT183A VS -2V VF 1.5V 0 1.5V VC VS -2V VBAT Figure 3: Recommended Application Circuit Diagram with L9907N for tracking regulation (VF = VC for 1.5V < VC < VS -2V): MODULE VBAT D1 IQ CS VS RPR RINC IINC INC PR OUT C RF D2 RC VC RCF VINC RINF VINF IINF L9907N VM OUT F IM M VF INF GND D95AT184 Note: Recommended value of RINC, RINF (equivalent input resistance to INC and INF) is 5K to 10K. Resistor RCF should assure that the differential input voltage |VINC - VINF| remains within the NEUTRAL ZONE, when the control signal wire become broken. When this condition is fulfiled the motor will not change its previous position. 4/8 L9907N An external resistor RCF is recommended between the slider of the control and feedback potentiometer. This resistor assures that in the case of input control or input feedback wire interruption the input differential voltage will be within the NEUTRAL ZONE and the motor position remains frozen. The circuit features an overvoltage disable function referred to the supply voltage VS higher than 18V, both outputs are forced to tristate in this condition. The thermal overload function disables the outputs (tristate) when the junction temperature increases above the thermal shutdown threshold temperature of min. 150C. For the start of a heavy loaded motor, if the motor current reaches the max. value it is necessary to respect the dynamical thermal resistance junction to ambient. The maximum output current is 0.8A. The maximum junction temperature in this phase should not increase above the thermal shutdown threshold. In case of output disable due to thermal overload the output remains disabled till the junction temperature decreases under the thermal enable threshold. This behaviour is assured with the thermal shutdown hysteresis threshold , which minimum value is 20C. Figure 3, 5 and 7 show typical application diagrams for headlight adjustment applications. To assure the safety of the circuits in the reverse battery condition a reverse protection diode D1, is necessary. The input currents in this condition are limited by the resistors RINC and RINF. The transient protection diode D2 must assure that the maximum rating for VS during the transients at VBAT line will be limited to a value lower than absolute maximum Figure 4: Control to feedbacktransfer characteristic for proportionalregulation with extended VC operating range: VBAT D95AT185A VS -2V VF 1.5V 0 1.5V VC VS -2V VBAT Figure 5: RecommendedApplication Circuit Diagram with L9907Nfor proportionalregulation with extended RINC2 VC: VC operating range. For ideal adjusted condition VF = RINC1 + RINC2 MODULE VBAT D1 IQ CS RINC1 VS RPR IINC VINC RINF VINF IINF INF GND INC PR OUT C RF D2 RC VC RINC2 L9907N VM OUT F IM M VF D95AT186 Note: Recommended value of RINC, RINF (equivalent input resistance to INC and INF) is 5K to 10K. If the motor should not change its position, when the control signal wire become open, RINC1 and RINC2 should be rated so that VINC 0.4V in this condition. 5/8 L9907N Figure 6: Control to feedback transfercharacteristic for proportionalregulation with reduced VC operating range: VBAT D95AT187A VS -2V VF rating for VS. The device features an output disable function in case of control input voltage overdrive. When the control input voltage increases above the HIGH control input disable threshold VINC > VINCH, typically VS -1.2V or decreases below the LOW control input disable threshold VINC > VINCH, typically 1.2V, then both outputs will be forced to tristate. The potential of the INC pin is clamped at the Control Input HIGH disable threshold potential with a series resistor of 5K typ. To activate the HIGH disable comparator an input current of 35A typ. is needed. To respect this behaviour in the application VCR is specified for different RINC. 1.5V 0 1.5V ALLOWED VC OPERATING RANGE VS -2V VC VBAT Figure 7: Recommended Application Circuit Diagram with L9907N for proportional regulation with reduced RINF2 VC: VC operating range. For ideal adjusted condition VF = RINF2 + RINF2 MODULE VBAT D1 IQ CS VS RPR RINC IINC INC PR OUT C RF D2 RC VC RCF VINC RINF1 VINF IINF L9907N VM OUT F IM M VF INF RINF2 GND D95AT188 Note: Recommended value of RINC, RINF (equivalent input resistance to INC and INF) is 5K to 10K. Resistor RCF should assure that the differential input voltage |VINC - VINF| remains within the NEUTRAL ZONE, when the control signal wire become broken. When this condition is fulfilled the motor will not change its previous position. 6/8 L9907N SO20 PACKAGE MECHANICAL DATA DIM. MIN. A a1 a2 b b1 C c1 D E e e3 F L M S 7.4 0.5 12.6 10 1.27 11.43 7.6 1.27 0.75 8 (max.) 0.291 0.020 13.0 10.65 0.35 0.23 0.5 45 (typ.) 0.496 0.394 0.050 0.450 0.299 0.050 0.030 0.512 0.419 0.1 mm TYP. MAX. 2.65 0.3 2.45 0.49 0.32 0.014 0.009 0.020 0.004 MIN. inch TYP. MAX. 0.104 0.012 0.096 0.019 0.013 7/8 L9907N Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics 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 SGS-THOMSON Microelectronics. Specification mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. SGS-THOMSON Microelectronics products are not authorized for use as criticalcomponents in life support devices or systems without express written approval of SGS-THOMSON Microelectronics. (c) 1996 SGS-THOMSON Microelectronics - Printed in Italy - All Rights Reserved SGS-THOMSON Microelectronics GROUP OF COMPANIES Australia - Brazil - Canada - China - France - Germany - Hong Kong - Italy - Japan - Korea - Malaysia - Malta - Morocco - The Netherlands Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A. 8/8 |
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