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TPIC0108B 데이터시트(PDF) 9 Page - Texas Instruments |
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TPIC0108B 데이터시트(HTML) 9 Page - Texas Instruments |
9 / 14 page TPIC0108B PWM CONTROL INTELLIGENT H-BRIDGE SLIS068 – NOVEMBER1998 9 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 PRINCIPLES OF OPERATION protective functions and diagnostics† over current/short circuit‡ The TPIC0108B detects shorts to VCC, ground, or across the load being driven, by comparing the VDS voltage drop across the DMOS outputs against the threshold voltage. The DMOS outputs of the TPIC0108B will be disabled and the fault flags will be generated 10 µs after an over-current or short-circuit fault is detected. This 10 µs delay is long enough to serve as a de-glitch filter for high current transients, yet short enough to prevent damage to the DMOS outputs. The DMOS outputs remain latched off until either IN1 or IN2 input is toggled. In cases where the outputs have a continuous short-to-ground or when enabled from quiescent mode with a short-to-ground already exists (current rise time faster than 0.5 A/ µs in both instances), the over-current shutdown threshold will decrease to 3 A to reduce power dissipation. This reduction to 3 A is achieved since the DMOS outputs will not be fully enhanced when the over-current threshold is reached if the current rise time exceeds 0.5 A/ µs. Over-current and/or short-circuit protection is provided up to VCC = 16.5 V and a junction temperature of 90 °C. over temperature The TPIC0108B disables all DMOS outputs and the fault flags will be set when TJ ≥140°C (min.). The DMOS outputs remain latched off until either IN1 or IN2 input is toggled. under voltage The TPIC0108B disables all DMOS outputs when VCC ≤V(UVCC). The outputs will be re-enabled when VCC ≥V(UVCC). No fault flags are set when under-voltage lockout occurs. over voltage In order to protect the DMOS outputs from damage caused by excessive supply voltage, the TPIC0108B disables all outputs when VCC ≥V(OVCC). Once VCC ≤V(OVCC), either IN1 or IN2 input must be toggled to re-enable the DMOS outputs. cross conduction Monitoring circuitry for each transistor detects whether the particular transistor is active to prevent the HSD or LSD of the corresponding half H-bridge from conducting. open circuit During operation, the bridge current is controlled continuously. If the bridge current is >10 mA (min.) for a period >1 ms (min.), the fault flags are set. However, the output transistors will not be disabled. † All limits mentioned are typical values unless otherwise noted. ‡ If a short circuit occurs (i.e., the over-current detection circuitry is activated) at a supply voltage higher than 16.5 V and a junction temperature higher than 90 °C, damage to the device may occur. |
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