CS3750 CS3750 100mA Dual H-Bridge Air-Core Gauge Driver Description The CS3750 is a dual H-bridge four quadrant air-core gauge driver. The IC provides all the functions necessary to drive a tachometer or speedometer as part of a microprocessor based multiplexed system. Digital input control eliminates the need for any analog calibration of the gauge. The controlling microprocessor sends out a PWM signal to each H bridge driver input (IN1, IN2). The PWM signal duty cycle is proportional to the HÐbridge output. Output current Features (100mA max) direction is controlled by the DIRECTION input. PWM switching noise is minimized at each half bridge by an internal RC filter and external programmable capacitor. The CS3750 is protected against 50V load dump, over voltage and thermal runaway fault conditions. Any of these faults causes the IC to shut down. Each high side of the output driver is current limited. A short circuit condition in one driver does not affect the others. Absolute Maximum Ratings Supply Voltage .................................................................................7.5V to +16V Internal Power Dissipation.....................................................Internally limited Logic Input Voltages .......................................................................Ð0.3V to 6.5V Junction Temperature Range ...................................................Ð40¡C to +150¡C Storage Temperature Range .....................................................Ð55¡C to +165¡C Lead Temperature Soldering Wave Solder (through hole styles only) ...........10 sec. max, 260¡C peak Electrostatic Discharge (Human Body Model)............................................8kV OUT1B C1 1/2 H -Bridge Driver with Current Limit 1/2 H -Bridge Driver with Current Limit DIRECTION Control OUT2A 1/2 H- Bridge Driver with Current Limit OUT2B C2 DIR1 1 1/2 H- Bridge Driver with Current Limit DIRECTION Control DIR2 C1 C2 IN1 IN2 Gnd Gnd Gnd Gnd OUT1A RC Filter for PWM Input RC Filter for PWM Input Package Options 16 Lead PDIP (internally fused leads) Block Diagram OUT1A ■ 2 Independent NPN H-Bridge Drivers ■ No Analog Trim Required ■ Used in Multiplexed Systems ■ Quiet Gauge Operation ■ Programmable Slew Rate Minimizes Switching Noise ■ Fault Protection Over Voltage Thermal Shutdown Short Circuit OUT2A VS1 VS2 OUT1B Overvoltage Thermal Shutdown OUT2B Gnd VREF VS1,2 DIR1 IN1 DIR2 IN2 Cherry Semiconductor Corporation 2000 South County Trail, East Greenwich, RI 02818 Tel: (401)885-3600 Fax: (401)885-5786 Email: [email protected] Web Site: www.cherry-semi.com Rev. 7/20/95 1 A ¨ Company CS3750 Electrical Characteristics: 7.5V <= VCC<=15V; -40¡C ² TA ² +85¡C unless otherwise specified. PARAMETER ■ Output Stage VOUT Saturation Voltage (Low Side) VOUT Offset Voltage VOUT Saturation High Side Low Side VOUT Differential Matching Voltage Supply Current ■ Input Stage VIN LOW HIGH Hysteresis IIN LOW HIGH Output Slew Rate with respect to input Output Turn on Delay with respect to input Output Turn off Delay with respect to input ■ Direction VDIR LOW HIGH Hysteresis IDIR LOW HIGH Output Slew Rate with respect to DIR Output Fall Time with respect to DIR Output Turn on Delay with respect to DIR Output Turn off Delay with respect to DIR ■ Protection Functions IOUT Current Limit (High Side Only) Over Voltage Threshold Hysteresis Thermal Shutdown Hysteresis TEST CONDITIONS IOUT=100mA; VIN=0V IOUT=1mA; VIN=0V VC=5V; IOUT=-30mA VIN=5V;IOUT=-100mA VIN=0V;IOUT=-1mA VC=5V, IOUT=-100mA MIN VS-2 VIN=VDIR=0; VIN decreasing; VDIR=0V VIN increasing; VDIR=0V VDIR=0V VIN=0.8V; VDIR=0V VIN=3.5V VIN=250Hz; RLOAD=150½ 0.8 TYP MAX UNIT 0.25 0.01 15 VS-1.5 0.02 0.50 0.10 50 VS 0.10 100 V V mV V V mV 23 45 mA 1.9 2.0 100 20 0.4 0.2 100 100.0 0.8 V V mV µA µA V/us VIN=250Hz; RLOAD=150½, note 1 1.5 6 µs VIN=250Hz; RLOAD=150½, note 2 2.4 9 µs VIN=5V; VDIR decreasing VIN=5V; VDIR increasing VIN=5V VIN=0V; VDIR=0.8V VIN=0V; VDIR=3.5V VIN=5V; fDIR=250Hz; C=0µF 0.8 0.2 VIN=0V; VDIR=0V; C=0µF VIN=5V; RLOAD=150½ VDIR=250Hz; C=0µF, note 1 VIN=5V; RLOAD=150½ VDIR=250Hz; C=0µF, note 2 1.9 2.0 100 40 0.4 1.5 3.5 100 100 V V mV µA µA V/µs 0.2 2.0 µs 1 6 µs 2.5 9 µs VIN=5V 100 225 VIN=5V 17.0 21.5 0.5 160 20 Note 1: Time required for output signal to rise to 90% of its amplitude after input signal switches. Note 2: Time required for output signal to decrease to 10% of its amplitude after input signal switches. 2 3.5 mA 26.0 V V ¡C ¡C CS3750 Package Pin Description PACKAGE PIN # PIN SYMBOL FUNCTION 16L PDIP (internally fused leads) 1 DIR1 CMOS compatible input pin controls direction of current through OUT1 2 C1 RC filter capacitor for OUT1 connected to Ground 3 IN1 CMOS compatible input pin controls output OUT1A and 1B 4,5,12,13 Gnd Ground connection 6 OUT1A One half of H-bridge output stage 1 7 VS1 Supply voltage 8 OUT1B One half of H-bridge output stage 1 9 OUT2B One half of H-bridge output stage 2 10 VS2 Supply voltage 11 OUT2A One half of H-bridge output stage 2 14 IN2 CMOS compatible input pin controls output OUT2A and 2B 15 C2 RC filter capacitor for OUT2 connected to Ground 16 DIR2 CMOS compatible input pin controls direction of current through OUT2 Circuit Description Output Stage Protection Each output stage contains 4 power NPN transistors arranged in a traditional H bridge configuration. Current flow through the two outputs (OUTxA, OUTxB) in each H-bridge is controlled by the logic signal DIRx. The high side driver transistor in each H-bridge is current limited as a protection against a short circuit fault condition. If an over voltage or a thermal runaway fault conditions occurs, all outputs shut down. PWM input signals from the microprocessor, are filtered on chip and sent to the output stage. The duty cycle of the PWM signal is proportional to output voltage. The RC filter reduces the noise of the PWM input signal by slowing its slew rate: i.e., the output signal is converted from a square wave to an exponential sawtooth waveform. An external capacitor (Cx) controls the slew rate for each H bridge. Application Diagram When the voltage on the control pin (INx) is low, both halves of the H bridge are off (Table 1). When INx is high, DIR controls the flow of current through the H-bridge. If DIRx=0, current flows from OUTxA out to the coil and back in through OUTxB. If DIRx=1, current flows from OUTxB out to the coil and back in through OUTxA. 1 C1 *C1 DIR2 DIR1 CS3750 Motor Direction Control I/O Microprocessor VBAT IN1 Gnd Gnd OUT1A Direction INX DIRX OUTxA OUTxB 0 X 0 0 1 0 1 0 1 1 0 1 Gnd Gnd VS2 OUT1B Input *C2 OUT2A VS1 Table 1. Logic Control of H-Bridge C2 IN2 OUT2B Outputs COIL1 * 0.047mF 3 COIL2 Air Core Gauge Circular Speedometer CS3750 Package Specification PACKAGE THERMAL DATA PACKAGE DIMENSIONS IN mm (INCHES) Thermal Data D Lead Count 16L PDIP (internally fused leads) Metric Max Min 19.69 18.67 English Max Min .775 .735 16L PDIP (internally fused leads) RQJC typ 15 ûC/W RQJA typ 50 ûC/W Plastic DIP (N); 300 mil wide 7.11 (.280) 6.10 (.240) 8.26 (.325) 7.62 (.300) 1.77 (.070) 1.14 (.045) 2.54 (.100) BSC 3.68 (.145) 2.92 (.115) .356 (.014) .203 (.008) 0.39 (.015) MIN. .558 (.022) .356 (.014) REF: JEDEC MS-001 D Some 8 and 16 lead packages may have 1/2 lead at the end of the package. All specs are the same. Ordering Information Part Number CS3750ENF16 Rev. 7/20/95 Cherry Semiconductor Corporation reserves the right to make changes to the specifications without notice. Please contact Cherry Semiconductor Corporation for the latest available information. Description 16L PDIP (internally fused leads) 4 © 1999 Cherry Semiconductor Corporation