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L6246 Datasheet(PDF) 6 Page - STMicroelectronics |
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L6246 Datasheet(HTML) 6 Page - STMicroelectronics |
6 / 12 page BLOCK DESCRIPTION POWER AMPLIFIERS The two power amplifiers are connected in bridge configuration working in AB class. SENSE AMPLIFIER This stage senses the voltage drop across the Rsense. The input stage is supplied by the charge pump voltage to have an high dynamic, while the other sections of the amplifier are supplied by the volt- age of 10.5V internally regulated to have an high power supply rejection (this voltage, supplies also the error amplifier, the input amplifier and the op- erational amplifier which generates the Vcc/2 volt- age). The open loop gain is around 80dB and the band- with is more than 1MHz. The voltage gain is fixed internally at 10 V/V. ERROR AMPLIFIER This is the stage which compares the input volt- age and the sense voltage, generating the control voltage for the power section. The open loop gain and bandwith of this amplifier are similar to the sense amplifier. The negative input and the output of the error am- plifier are accessible externally in order to have the current loop compensation user configurable. The dynamic of the output is limited at +/- 2Vbe to have a faster response of the output voltage. INPUT AMPLIFIER The inputs and the output pins are externally ac- cessible to have the possibility to configure the transconductance gain of the current control loop selecting the voltage gain of this amplifier. The open loop gain and bandwith of this amplifier are similar to the sense amplifier. REFERENCE VOLTAGE GENERATOR This block generates the two reference voltage Vcc/2 and +5VREF. The Vcc/2 voltage is used as reference by the current control loop. The +5VREF is a very stable voltage generator that can be used as reference voltage of an exter- nal DAC. ELECTRICAL CHARACTERISTICS (continued) Symbol Parameter Test Condition Min. Typ. Max. Unit POWER AMPLIFIER Rdson DMOS on resistance at 25 °C 0.3 Ω Gdv Differential voltage gain 32 V/V Iol Output current leakage 500 µA SR Output slew rate 0.4 V/ µs Tsr Saturation recovery time 5 µs GBW Gain bandwidth product 100 KHz RETRACT Vr Max. retract voltage Vcc shorted to GND 300 mV Vr Max. retract voltage Vcc Normal 1 V CHARGE PUMP Cs Storage capacitor 1 µF Vs Storage voltage Vcc +4 V Cp Pump capacitor 0.2 µF RETRACT TRUTH TABLE Input Input Output Output -Retract +Enable Bridge Enable +Retract Brake and Retract 0 X 0 1 Run 1110 Disable 1000 L6246 6/12 |
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