AM9268Q

Motor Driver ICs

http://www.amtek-semi.com

M

2

Specifications subject to change without notice

- 12

RSL1

GND

M

SL1P

SL1N

SL1IN

BIAS

CTL

1.65V

Rin

VCC12

Forward

Reverse

RSL2

GND

SL2P

SL2N

SL2IN

BIAS

CTL

1.65V

Rin

VCC12

Forward

Reverse

M

RS

RS

The example of current-gain and current-limit of SLEDGE

Gio*[A/V]

RS[Ω]

Ilim[A]

Rin=15kΩ

0.50

1.00

1.00

0.75

0.66

0.66

1.00

0.50

0.50

Gio*=15k/[(Rin+15k)RS][A/V]

3) PWM carrier frequency setting

PWM carrier frequency is decided by charging and discharging capacitor that is

connected to OSC terminal outer IC. Examination of the relationship the capacitor

connected to OSC terminal and PWM carrier frequency is given in following table.

Capacitor[pF]

820

750

330

220

180

130

110

Carrier Frequency[kHz]

28

30

65

90

110

140

160

*This PWM carrier frequency is TYP value.

4) Phase delay circuit at sledge

Phase delay circuit is built in the IC to detect an output spike current, when the motor

current direction is switching. In switching the motor current direction, Phase delay

circuit switch-off all output transistor of H-bridge for 3 μsec.

5) The built-in thermal shutdown circuit mutes the output current when the chip

temperature reaches 175℃ (typ.). The hysteresis is set to 25℃ (typ.), so the circuit will

start up again when the chip temperature falling to 150℃ (typ.).