AN2986 datasheet(11/18 Pages) STMICROELECTRONICS

11 / 18 page

AN2986

Gate current variation

Doc ID 15727 Rev 1

11/18

The Z01’s maximum VGT is then close to 1.1 V at 1.44 A peak load current in negative half-

wave, for a 0 °C junction temperature (worst case). A maximum value of 1.3 V is used, as

specified in the Z01 datasheet for 25 °C.

The ACS108’s maximum absolute VGT is close to 1 V for a 1.15 A peak load current, for

a 0 °C junction temperature (worst case). A maximum value of 1 V is used, as specified in

the ACS108-6T datasheet for 25 °C.

Two examples are shown. The same components are used as those given in Section 1.2.2.

Note that different values than those specified in Table 1 could be used, especially if a

different gate current is applied. Values are then taken from the MCU datasheet curves (for

example.: STM8S10xxx).

Example 3: MCU: STM8S with ACS108 -6T for power supply 5 V ±10%

Specified values:

RG =180 Ω, VDD = 5 V, VGT (25 °C) = 1 V

Calculated values: VDD min= 0.9 x 5 V = 4.5 V

VGT (0 °C) = 1 + 0.05 V

VOLmax (25 °C, 16 mA) = 0.6 V

IGmin is then given by:

Equation 5

The MCU is able to provide current that is above the minimum gate current for ambient

temperature 0 °C. An estimation of VOLmax has been provided for one high-sink I/O port of

STM8S up to 16 mA. A standard I/O port could have lower current capability (10 mA), in

which case several I/O ports have to be put in parallel.

Example 4: STM32 + Z0103 for 3.3 V ±5%

Specified values:

RG = 300 Ω, VDD = 3.3 V, VGT (25 °C) = 1.3 V

Calculated values: VDDmin = 0.95 x 3.3 V = 3.13 V,

VGT (0 °C) = 0.05 + 1.3 V

VOLmax (IGT = 8 mA) = 0.4 V

IGmin is then given by:

Equation 6

The MCU is able to provide current that is above the minimum gate current for ambient

temperature 0 °C. An estimation of VOLmax has been provided for one I/O port of STM32

(when 8 I/O ports are sunk with 8 mA each at the same time). If the current sunk by one I/O

exceeds 8 mA, the value of 1.3 V should be used instead of 0.4 V.

Gmin

4.5

1.05

–

0.6

–

1.01

180

----------------------------------------

15.7mA

Gmin

3.13

1.35

–

0.4

–

1.01

300

-------------------------------------------

4.6mA

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