L9903 STMicroelectronics

L9903 MOTOR BRIDGE CONTROLLER 1 FEATURES Figure 1. Package OPERATING SUPPLY VOLTAGE 8V TO 20V, OVERVOLTAGE MAX. 40V OPERATING SUPPLY VOLTAGE 6V WITH IMPLEMENTED STEPUP CONVERTER QUIESCENT CURRENT IN STANDBY MODE SO20 LESS THAN 50A ISO 9141 COMPATIBLE INTERFACE Table 1. Order Codes CHARGE PUMP FOR DRIVING A POWER MOS AS REVERSE BATTERY PROTECTION Part Number Package PWM OPERATION FREQUENCY UP TO L9903 SO20 30KHZ L9903TR Tape & Reel PROGRAMMABLE CROSS CONDUCTION PROTECTION TIME 2 DESCRIPTION OVERVOLTAGE, UNDERVOLTAGE, SHORT Control circuit for power MOS bridge driver in auto- CIRCUIT AND THERMAL PROTECTION motive applications with ISO 9141bus interface. REAL TIME DIAGNOSTIC Figure 2. Block Diagram 10 VS R CP Reference VCC - 1 ST BIAS + 11 Charge CP = V pump STH 13 CB1 12 f ST GH1 VCC Overvoltage 14 Undervoltage S1 R DG 2 DG Thermal shutdown R = S1 V S1TH 19 GL1 4 EN R R EN GL1 18 GL2 5 DIR R GL2 R DIR VCC 17 S2 R PWM 3 PWM R = S2 V S2TH 6 15 GH2 PR Timer 16 CB2 ISO-Interface 9 K 7 RX R RX = 0.5 V VS VCC R TX 8 TX I KH 20 GND REV. 5 September 2013 1/17 Control LogicL9903 Table 2. Pin Function N Pin Description 1 ST Open Drain Switch for Stepup converter 2 DG Open drain diagnostic output 3 PWM PWM input for H-bridge control 4 EN Enable input 5 DIR Direction select input for H-bridge control 6 PR Programmable cross conduction protection time 7 RX ISO 9141 interface, receiver output 8 TX ISO 9141 interface, transmitter input 9 K ISO 9141 Interface, bidirectional communication K-line 10 VS Supply voltage 11 CP Charge pump for driving a power MOS as reverse battery protection 12 GH1 Gate driver for power MOS highside switch in halfbridge 1 13 CB1 External bootstrap capacitor 14 S1 Source/drain of halfbridge 1 15 GH2 Gate driver for power MOS highside switch in halfbridge 2 16 CB2 External bootstrap capacitor 17 S2 Source/drain of halfbridge 2 18 GL2 Gate driver for power MOS lowside switch in halfbridge 2 19 GL1 Gate driver for power MOS lowside switch in halfbridge 1 20 GND Ground Figure 3. Pin Connection (Top view) ST 1 20 GND DG 2 19 GL1 PWM 3 18 GL2 EN 4 17 S2 DIR 5 16 CB2 PR 6 15 GH2 RX 7 14 S1 TX 8 13 CB1 K 9 12 GH1 VS 10 11 CP SO20 2/17