[AP1029ADR]

016015401-E-00

2017/01

- 10 -

10.

Functional Descriptions

10.1

Output Voltage

Output voltage (Vout), is controlled by the PWM control mode that depends on the external reference

voltage input to the VDUTY pin. However, Vout never exceeds VM. Vout is affected by on-resistance, load

current and etc. under loaded condition.

Vout = VDUTY × N

(under no-load condition)

"N" is set by the M1 and the M0 pins as follows. However, in the case of M0 pin = M1 pin = "H", the

AP1029ADR will not be in PWM control mode but be in Input control mode according to the INA and the

INB inputs. Start-up function does not work at this time. When the AP1029ADR is used in input control

mode, make sure that the VDUTY pin and the POL pin are Open.

For example, Vout will be 3V by setting M1 = M0 pins = “L” when VDUTY is 1.5V, and It will be 6V by

setting M0 = “H” and M1 = “L” when VDUTY is 1.5V.

Table 1. Output Voltage Setting Table

M1

M0

Mode of operation

Start-up function

L

L

N=2、PWM control mode

On

L

H

N=4、PWM control mode

On

H

L

N=8、PWM control mode

On

H

H

Input control mode

(INA and INB Inputs response operation)

Off

10.2

Control Logic

The relationship between the input and output of each mode are shown below.

Table 2. Truth Table

Input

Output

Function

EN

INA

INB

OUTA

OUTB

H

L

L

Hi-Z

Hi-Z

Standby(idle)

H

L

H

L

H(PWM)

Reverse

H

H

L

H(PWM)

L

Forward

H

H

H

L

L

Brake(stop)

L

-

-

Hi-Z

Hi-Z

Stop

Note 10. See Figure 8 and Figure 9 for timing chart of Standby and Stop. See Figure 3 for timing chart of

Brake.