L585

L 585 CAR ALTERNATOR REGULATOR . . . . . . . . ALTERNATOR VOLTAGE CONTROL COMPLETE FAULT DIAGNOSTICS DRIVES 3 W LAMP DIRECTLY LAMP SHORT CIRCUIT PROTECTION SENSING INTERRUPT PROTECTION 100 V DUMP PROTECTION 300 V LOW ENERGY SPIKE PROTECTION THERMAL PROTECTION DIP16 DESCRIPTION The L585 is an integrated circuit designed for use with an NPN darlington as a voltage regulator in a threephase alternator charging system. It includes fault diagnostic circuitry which drives a 3 W warning lamp in fault conditions such as open or short circuit connections. Protection against load dump transients, short circuits and low energy spikes is incorporated. BLOCK DIAGRAM SO16 ORDERING NUMBERS : L585 (DIP16) L585D1 (SO16) November 1991 1/9 L585 P IN CONNECTION (*) MUST BE LEFT FLOATING ABSOLUTE MAXIMUM RATINGS Symbol VS VD Tj Ptot Tstg Top Dump Voltage Junction Temperature Range Power Dissipation at Tamb = 80°C Junction and Storage Temperature Range Operating Temperature Range Parameter Operating supply Voltage (through R S) Value 28 100 – 40 to 150 1 – 55 to 150 – 40 to 125 Unit V V °C W °C °C THERMAL DATA Symbol Parameter Max Max Value 80 50 Unit °C/W °C/W Rth j-amb Thermal Resistance Junction-ambient (*) for DIP 16 Rth j-alumina(*) Thermal Resistance Junction-alumina for SO-16 No te : Soldered on PC board that simulates an application with medium device density on board. (*) Thermal resistance junction-pins with the chip soldered on the middle of an alumina supporting substrate measuring 15 ö 20 mm ; 0.65 mm thickness and infinite heathsink. 2/9 L585 PIN FUNCTIONS N° 1 Name Alternator Voltage Sensing Functions Connection for voltage regulation sensing. The regulation sensitivity is a function of R1 and is given by : ∆ VA S= = 0.5mV ⁄ Ω ∆ R1 A capacitor connected between these two pins filters the feedback signal from the regulated output. Typically the input impedance is 15KΩ. When this pin is left open circuit the overvoltage threshold is a described in the specification. Typically the warning lamp is switched on when the voltage at this pin is greater than 3.5V. This threshold can be modified with a resistor between either the ground or pin 2. This pin must be connected to ground. This pin drives the external darlington disabling it by shorting the current in RB to ground. These pins must be left floating. Supply Voltage Input A 7.5V (typical) Zener is present at the input. A capacitor connected to ground sets the frequency of the internal oscillator. The frequency is given by : fosc = 12 13 GND Lamp Driver 20 x 10 8.4 x C osc −6 2-3 4 Filter Capacitor Alternator Overvoltage Adjustment 5 6 7-8-9 10 11 GND Darlington Driver N.C. IC Supply Voltage Oscillator Capacitor This pin must be connected to ground. Current Driver for External Lamp for Diagnostics. Internally protected agains short circuits (current limiting), load dump transients and, by means of a zener, against low energy spikes. Not connected. Connection for no charge sensing from the alternator . The internal low threshold is typically 2.4V. By means of the external divider R3/R4 the threshold can be adjusted to give the required sensitivity. Connection for Voltage Battery Sensing This pin senses a failure of the alternator-battery lead as the voltage difference VA-VS. The external resistor R2 limits the current in overvoltage protection. 14 15 NC Phase Voltage Sensing. 16 Battery Voltage Sensing 3/9 L585 ELECTRICAL CHARACTERISTICS (Vs = 14.4V ; – 30°C ≤ Tj ≤ 100°C unless otherwise specified ; refer to application circuit) Symbol Parameter Test Conditions Min. Typ. Max. Unit REGULATION VS Id VA Operating Supply Voltage Quiescent Drain Current (pin 10) Alternator Reg. Voltage V10 = 5.5V Tj = 20°C, t = 100ms R 1 = 1.3KΩ (1) Tj = – 30°C Tj = + 100°C 10% < d < 90% S = dVA/dR1 1/S* dS/dT I6 = 20mA C osc = 20nF Vbatt = 12V 80 0.35 – 2000 200 170 2 14.26 14.60 13.32 ± 60 0.65 14.55 6 25 24 14.84 15.50 14.17 V mA V V V mV mV/Ω ppm/°C mV Hz mA ∆VA S TCnS V6 sat fs I1 Voltage Reg. Range Sensitivity to R1 Variation Normalized S Temperature Coeff. Darlington Driver Satur. Voltage Oscillation Frequency Standby Current (pin 1) DIAGNOSTIC VAH Overcharging Voltage Threshold (2) Tj = 25°C R 1 = 1.3KΩ VS = VAH (3) – 30°C < Tj < + 100°C f = 600Hz, Tj = 25°C – 30°C < Tj < + 100°C 1.054VA 1.049VA 5 4.5 2.33 2.00 6 6 3.10 3.31 1.086VA 1.091VA 7 7.5 3.88 4.18 1.5 4.5 70 1.50 V V V V V V V V s VPL VAS V1 3 sat V1 3 off td No tes : 1. 2. 3. 4. 5. 6. 7. Low Level Phase Voltage Threshold (no load) (4) Difference Between Altern. and Tj = 25°C Supply Voltage (5) – 30°C < Tj < + 100°C Lamp Driver Saturation Voltage Lamp Driver Voltage Power Supply (6) Alarm Delay I1 3 = 250mA without R S > 48Ω C osc = 20nF d = 50 % the duty cycle of the output signal at pin 6. The lamp is switched on with a fixed delay when the alternator voltage becomes higher than VAH. (overcharge indication). Measured 100 ms after turn-on. The lamp is switched on with a fixed delay when the voltage Vp becomes lower than VPL (the alternator is not charging the battery). The lamp is switched on when the cable B is broken (VA - VS becomes higher than VAS). The lamp is switched on when the cable A is broken (IC without power voltage supply). When the voltage at pin 1 is greater than V1 dp the internal darlington of the lamp is switched off. 4/9 L585 ELECTRICAL CHARACTERISTICS (continued) Symbol Parameter Test Conditions Min. Typ. Max. Unit PROTECTION Tsh VZen V1dp I1 3 sc Idump VZ13 Darlingtyon Threshold Thermal Shutdown IO = 60mA IO = 130mA Tj = 25°C – 30°C < Tj < + 100°C 150 6 6.2 25 23 300 32 8 8.2 38 40 1500 200 110 100 90 °C V V V V mA mA V V V (pin 10) Zener Voltage Overvoltage Protection Threshold (7) Lamp Driver Circuit Current Pin 13 Dump Sustaining Capapility V1 3 = 110V@ Tj = 25°C Current V1 = 50V@ t = 100ms Zener Clamping Voltage I1 3 = 100mA@ t = < 3ms I1 3 = 40mA@ t = < 6ms, full T TJ = -30°C Notes : 1. 2. 3. 4. 5. 6. 7. d = 50 % the duty cycle of the output signal at pin 6. The lamp is switched on with a fixed delay when the alternator voltage becomes higher than VAH. (overcharge indication). Measured 100 ms after turn-on. The lamp is switched on with a fixed delay when the voltage Vp becomes lower than VPL (the alternator is not charging the battery). The lamp is switched on when the cable B is broken (VA - VS becomes higher than VAS). The lamp is switched on when the cable A is broken (IC without power voltage supply). When the voltage at pin 1 is greater than V1 dp the internal darlington of the lamp is switched off. CIRCUIT OPERATION The L585 alternator regulator performs two main functions : regulation control and fault diagnostics. REGULATION The alternator voltage is compared with a reference voltagein an error amplifier (see block diagram), the output of which determines the duty cycle of the external darlington. This darlington switches the current in the excitation coil of the alternator. The switching frequencyis fixed and is set by the external capacitor COSC (see application circuit). CaDIAGNOSTIC This circuit receives informationfrom the battery,the alternator and one alternator phase. It indicates anomolousconditions by driving a 3 W lamp. To prevent spurious fault warnings some indications are not displayed immediately but are delayed by a fixed time. No external components are needed to implement this delay since it is produced internally by dividing the internal oscillator with an eight-stage divider to give a delay of 128 periods. For a one second delay the oscillator frequency must be 128 Hz. pacitive positive feedback and a monostable eliminatesspurious switching caused by contact bounce. The basecurrent deliveredto the external darlington it set by the resistor RB (see application circuit) and must be dimensioned according to the characteristics of this darlington and the maximum coil current. The lamp is driven after a delay when the following conditions occur : no charge, break or short circuit in the alternator sense wire. The diagnostic lamp is driven immediately when the cable connectingthe alternator to the battery is broken (Va-Vbatt above 2.6 typ.) or when the IC is without power supply (VCE sat of the lamp driver is 2.4 V typ. in this case). 5/9 L585 PROTECTION SHORT CIRCUIT PROTECTION The integrated darlington is protected against short circuits of the lamp. The short circuit current is limited at 600 mA and if this condition persistes thermal protection will intervene. DUMP PROTECTION The whole IC is protected against load dump transients (100 V, 300 ms with a rise time greater than 5 ms) in the typical application circuit. The only component to which this transient is directly applied (no Figure 1 : Application Circuit. series resistances) is the lamp driver darlington. During transients the darlington is kept off and can withstand peak voltages of 100 V. Additionally, the IC can withstand low energy spikes up to 300 V. These spikes are clamped by an internal 100 V zener on the collector of the lamp driver darlington. THERMAL PROTECTION When the IC temperature reaches 170 °C the lamp driver darlington is kept off. The device is able to withstand all the voltage transients mentioned in ISO DP7637/1. If voltage transients more severe than the above ISO standard have to be withstood, an external protection device 6/9 (transil) must be connected between pin 15 and GND. For transients up to 250V, tpulse = 500µs, Rsource = 47Ω, the transil P6KE100P is recommended. L585 DIP16 PACKAGE MECHANICAL DATA DIM. MIN. a1 B b b1 D E e e3 F I L Z 3.3 1.27 8.5 2.54 17.78 7.1 5.1 0.130 0.050 0.51 0.77 0.5 0.25 20 0.335 0.100 0.700 0.280 0.201 1.65 mm TYP. MAX. MIN. 0.020 0.030 0.020 0.010 0.787 0.065 inch TYP. MAX. 7/9 L585 SO16 PACKAGE MECHANICAL DATA DIM. MIN. A a1 a2 b b1 C c1 D E e e3 F L M S 3.8 0.5 9.8 5.8 1.27 8.89 4.0 1.27 0.62 8° (max.) 0.150 0.020 10 6.2 0.35 0.19 0.5 45° (typ.) 0.386 0.228 0.050 0.350 0.157 0.050 0.024 0.394 0.244 0.1 mm TYP. MAX. 1.75 0.2 1.6 0.46 0.25 0.014 0.007 0.020 0.004 MIN. inch TYP. MAX. 0.069 0.008 0.063 0.018 0.010 8/9 L585 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. Specifications 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 critical components in life support devices or systems without express written approval of SGS-THOMSON Microelectronics. © 1994 SGS-THOMSON Microelectronics - All Rights Reserved SGS-THOMSON Microelectronics GROUP OF COMPANIES Australia - Brazil - France - Germany - Hong Kong - Italy - Japan - Korea - Malaysia - Malta - Morocco - The Netherlands - Singapore Spain - Sweden - Switzerland - Taiwan - Thaliand - United Kingdom - U.S.A. 9/9