NCP81243_17 datasheet(23/26 Pages) ONSEMI

Part #	NCP81243

Description	Dual Output 3 & 2 Phase Controller

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Manufacturer	ONSEMI [ON Semiconductor]

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NCP81243

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23

Protection Features

Under Voltage Lockouts

There are several under voltage monitors in the system.

Hysteresis

is

incorporated

within

the

comparators.

NCP81243 monitors the 5 V VCC supply. The gate driver

monitors both the gate driver VCC and the BST voltage.

When the voltage on the gate driver is insufficient it will pull

DRON low and prevents the controller from being enabled.

The gate driver will hold DRON low for a minimum period

of time to allow the controller to hold off it’s startup

sequence. In this case the PWM is set to the MID state to

begin soft start.

DAC

Gate Driver Pulls DRON

Low during driver UVLO

and Calibration

If DRON is pulled low the

controller will hold off its

startup

Figure 8. Gate Driver UVLO Restart

Start Up Sequence

Following the rise of Vcc and VRMP above the UVLO

thresholds, externally programmed data is collected. After

the configuration data is collected, the PWMs will be set to

2.0 V MID state to indicate that the drivers should be in

diode mode. When the device is enabled DRON will then be

asserted high to activate the gates, please note that there is

only one Enable pin, once this enable is pulled high both the

main and Auxiliary rail is enabled at this time. A digital

counter steps the DAC up from Zero to the target voltage

level based on the soft start slew rate selected. As the DAC

ramps the PWM outputs for each rail will begin to fire. Each

phase will move out of the MID state when the first PWM

pulse is produced. When the controller is disabled the PWM

signal will return to the MID state. When the controller is

disabled, the PWM signals will return to Mid – level.

Figure 9. Startup Operation

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