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L6207 Arkusz danych(PDF) 4 Page - STMicroelectronics |
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L6207 Arkusz danych(HTML) 4 Page - STMicroelectronics |
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4 / 53 page  AN1762 APPLICATION NOTE 4/53 2 MAIN DIFFERENCES BETWEEN L6205, L6206, L6207 L6205, L6206 and L6207 are DMOS Dual Full Bridge ICs. L6205 (see Figure 1) includes logic for CMOS/TTL interface, a charge pump that provide auxiliary voltage to drive the high-side DMOS, non dissipative over current protection circuitry on the high-side DMOS, with fixed trip point set at 5.6 A (see Over Current Protection Section), over temperature protection, Under Voltage Lock- Out for reliable start-up. In addition, L6206 gives the possibility of adjusting the trip point of the over current protection for each of the two full-bridges (through two external resistors), and its internal open-drain mosfets (see Over Current Protec- tion Section) are not internally connected to EN pins but to separate OCD pins, allowing easier external diagnos- tics and overcurrent management. L6207 has Over Current protection function with fixed trip point set at 5.6 A and internal open-drain mosfets connected to EN pins, as the L6205, but it also integrates two PWM current controller for each of the two full- bridges (see Programmable off-time Monostable section). 3 DESIGNING AN APPLICATION WITH L6205, L6206, L6207 3.1 Current Ratings With MOSFET (DMOS) devices, unlike bipolar transistors, current under short circuit conditions is, at first ap- proximation, limited by the RDS(ON) of the DMOS themselves and could reach very high values. L6205, L6206, L6207 Out pins and the two VSA and VSB pins are rated for a maximum of 2.8A r.m.s. and 5.6A peak (typical values), corresponding to a total (for the whole IC) 5.6A rms (11.2A peak). These values are meant to avoid damaging metal structures, including the metallization on the die and bond wires. In practical applications, though, maximum allowable current is less than these values, due to power dissipation limits (see Power Management section). The devices have a built-in Over Current Detection (OCD) that provides protection against short circuits between the outputs and between an output and ground (see Over Current Protection section). 3.2 Voltage Ratings and Operating Range The L6205, L6206, L6207 requires a single supply voltage (VS), for the motor supply. Internal voltage regulators provide the 5V and 10V required for the internal circuitry. The operating range for VS is 8 to 52V. To prevent working into undesirable low supply voltage an Under Voltage Lock Out (UVLO) circuit shuts down the device when supply voltage falls below 6V; to resume normal operating conditions, VS must then exceed 7V. The hys- teresis is provided to avoid false intervention of the UVLO function during fast VS ringings. It should be noted, however, that DMOS's RDS(ON) is a function of the VS supply voltage. Actually, when VS is less than 10V, RDS(ON) is adversely affected, and this is particularly true for the High Side DMOS that are driven from VBOOT supply. This supply is obtained through a charge pump from the internal 10V supply, which will tend to reduce its output voltage when VS goes below 10V. Figure 4 shows the supply voltage of the high side gate drivers (VBOOT - VS) versus the supply voltage (VS). |
Podobny numer części - L6207 |
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Podobny opis - L6207 |
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