L6204D データシートの表示（PDF） - STMicroelectronics

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L6204D

DMOS DUAL FULL BRIDGE DRIVER

STMicroelectronics 

L6204

TRANSISTOR OPERATION

ON STATE

When one of the POWER DMOS transistors is ON it can be considered as a resistor RDS(ON) = 1.2Ω at

a junction temperature of 25°C.

In this condition the dissipated power is given by :

PON = RDS(ON) · IDS2

The low RDS(ON) of the Multipower-BCD process can provide high currents with low power dissipation.

OFF STATE

When one of the POWER DMOS transistor is OFF the VDS voltage is equal to the supply voltage and only

the leakage current IDSS flows. The power dissipation during this period is given by :

t(s) POFF = VS · IDSS

uc TRANSITIONS

d Like all MOS power transistors the DMOS POWER transistors have as intrinsic diode between their

ro source and drain that can operate as a fast freewheeling diode in switched mode applications.

P During recirculation with the ENABLE input high, the voltage drop across the transistor is RDS(ON) . ID

te and when the voltage reaches the diode voltage it is clamped to its characteristic.

le When the ENABLE input is low, the POWER MOS is OFF and the diode carries all of the recirculation

o current. The power dissipated in the transitional times in the cycle depends upon the voltage and current

s waveforms in the application.

b Ptrans = IDS(t) × VDS(t)

) - O BOOTSTRAP CAPACITORS

t(s To ensure the correct driving of high side drivers a voltage higher than VS is supplied on pin 20 (Vboot).

c This bootstrap voltage is not needed for the lower power DMOS transistor because their sources are

u grounded. To produce this voltage a charge pump method is used and mAde by two external capacitors

d and two diodes. It can supply the 4 driving blocks of the high side drivers. Using an external capacitor the

ro turn-on speed of the high side driver is very high; furthermore with different capacitance values it is pos-

P sible to adapt the device to different switching frequencies. It is also possible to operate two or more

te L6204s using only 2 diodes and 2 capacitance for all the ICs; all the Vboot pins are connected to the Cs-

tore capacitance while the pin 11 (VCP) of just one L6204 is connect to Cpump, obviously all the L6204 ICs

le have to be connected to the same VS. (see fig. 6)

Obso Figure 3. Two Phase Chopping

IN1 = H

IN2 = L

EN1 = H

6/12

IN1 = L

IN2 = H

EN1 = H

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