MTS62C19A datasheet(10/20 Pages) MICROCHIP

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MTS62C19A

DS22260C-page 10

 2010-2013 Microchip Technology Inc.

When the maximum allowed current is reached, the

bridge source is turned off during a fixed period TOFF

(typically 50 µs) given by a non-retriggerable pulse

generator and the external timing components Rt

(20k – 100 k

 range) and C

(100 pF – 1000 pF

range):

EQUATION 3-2:

During TOFF the winding current decreases. When the

driver is re-enabled, the winding current increases

again until it reaches the threshold, and the cycle

repeats itself, maintaining the load current at the

desired level.

FIGURE 3-3:

PWM Output Current

Waveform.

3.3

Circuit Protection

A thermal protection circuitry turns off all drivers when

the junction temperature exceeds a safe operating limit

of +170°C (typical). This protects the devices from

failure due to excessive heating. Despite this thermal

protection, output short circuits are not permitted. The

output

drivers

are

re-enabled

once

junction

temperature has dropped below +145°C (typical).

FIGURE 3-4:

Thermal Shutdown Output

vs. Temperature Showing Hysteresis.

undervoltage

lockout

circuit

protects

the

MTS62C19A from potential shoot-through currents

when the load supply voltage is applied prior to the

logic supply voltage. The power bridge and all outputs

are disabled if VLOGIC is smaller than 4V.

With this protection feature, the circuit will withstand

any order of turn-on or turn-off of the supply voltages

VLOGIC and VLOAD. Normal dV/dt values are assumed.

OFF

1.1







PHASE

IOUT

toff

ton

+170°C

+145°C

thshtd_en

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