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TAS5100 Datasheet(PDF) 7 Page - Texas Instruments |
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TAS5100 Datasheet(HTML) 7 Page - Texas Instruments |
7 / 16 page TAS5100 SLLS419B − MARCH 2001 − REVISED NOVEMBER 2001 7 www.ti.com functional description PWM H-bridge state control The digital interface control signals consists of PWM_AP, PWM_AM, PWM_BP, and PWM_BM. These signals are a complementary differential signal format for the A-side H-bridge and the B-side H-bridge. bootstrapped gate drive The TAS5100 includes 2 dedicated bootstrapped power supplies. A bootstrap capacitor is connected between the individual bootstrap pin and the associated output as described in the application note SLAA117. For example, a capacitor will be connected between the BOOTSTRAPA pin and OUTPUTA pin, and another capacitor will be connected between the BOOTSTRAPB pin and the OUTPUTB pin. The bootstrap power supply minimizes the number of high voltage power supply levels externally supplied to the system while providing a low noise supply level for driving the high-side N-channel DMOS transistors. See application note SLAA117 for details. low-dropout voltage regulator Two on-chip low-dropout voltage regulators (LDO) are provided to minimize the number of external power supplies needed for the system. These voltage regulators are for internal circuits only and cannot be used for external circuitry. Each LDO is dedicated to an H-bridge and its gate driver. An LDO output capacitor is connected between the individual LDO output pin and the associated output return as described in the application note SLAA117. For example, a capacitor will be connected between the LDROUTA pin and PVSS pin, and another capacitor will be connected between the LDROUTB pin and PVSS pin. high-current H-bridge output stage The positive outputs of the H-bridge are the two OUTPUTA pins. The negative outputs of the H-bridge are the two OUTPUTB pins. The logic for the input command to H-bridge outputs is described in the H-bridge output mapping section below. When the TAS5100 is in the normal mode, as seen in the H-bridge output mapping tables, the outputs are decoded from the inputs. However, the TAS5100 is immediately shut down if any of the following error conditions occur: over-current, over-temperature, low regulator output voltage, or an illegal PWM input state is applied. For these conditions, the outputs are set to the appropriate disabled state as specified in the H-bridge output mapping section, and the SHUTDOWN pin is set low. H-bridge output mapping The A-side H-bridge output is designed to the following truth table: INPUTS OUTPUTS DESCRIPTION RESET PWDN PWM_AP PWM_AM SHUTDOWN OUTPUTA DESCRIPTION X X X X 0 0 or Hi-Z† Shutdown X 0 X X 1 Hi-Z Powerdown 0 1 X X 1 0 Reset 1 1 0 0 0 0 Shutdown 1 1 0 1 1 0 Normal 1 1 1 0 1 1 Normal 1 1 1 1 0 0 Shutdown † Output is 0 for low voltage, over temperature, and illegal input. Hi-Z is for over current. |
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