RT6310ASLASHAH datasheet(13/54 Pages) RICHTEK

13 / 54 page

RT6310

is a registered trademark of Richtek Technology Corporation.

DS6310-04

August 2023

www.richtek.com

during the ON state of high-side MOSFET. During the

ON state of high-side MOSFET, the measured high-side

MOSFET voltage is proportional to the high-side

MOSFET current.

In order to prevent the device from inductor saturation

or any risk of damage, if the measured high-side

MOSFET current is higher than peak current-limit

threshold, the on-time timer is terminated immediately

to limit the inductor current and the inductor current is

decreased by turning on the low-side MOSFET. Once

the low-side MOSFET current is below valley current-

limit threshold, the next one-shot on-time timer is

permitted to generate. The circuit of the cycle-by-cycle

peak current limit works in every switching cycle.

Output Under-Voltage Protection (UVP)

The output under-voltage protection of RT6310 includes

latched and hiccup mode. If the inductor current is

higher than current-limit threshold (valley/peak current-

limit threshold) during heavy-load condition, the output

voltage tends to drop because the load demand

exceeds that the converter can support.

When the load demand is larger than the current ability

converter,

the

VFB

(RT6310A/AH/D/DH)/VOUT

(RT6310B/BH) / VFF (RT6310C/CH) starts to drop.

Once the VFB/ VOUT/ VFF drops below typical 60% of

reference/target voltage and the time length of this state

is larger than the time width 11

s (typical), the

latched/hiccup mode UVP is triggered. The different

behaviors for latched/hiccup mode UVP is as follows :

⚫

The RT6310A/B/C/D provides output under-voltage

protection (UVP) with latched mode. Once UVP is

triggered, the IC stops PWM switching and enter

latched mode. If UVP event is released, users should

re-toggle the EN/MODE pin or power recycle VIN

supply to re-power on the device.

⚫

The RT6310AH/BH/CH/DH provides output under-

voltage protection (UVP) with hiccup mode. Once

UVP is triggered, the IC takes a determined period for

initiating auto-recovery soft-start sequence. If UVP

event is released, the output voltage is regulated to

target reference.

Output Over-Voltage Protection (OVP)

The output over-voltage protection of RT6310 includes

latched and non-latched mode. If the VFB/VOUT/VFF

rises above typical 120% of reference/target voltage

and the time length of this state is larger than the time

width 12

s (typical), the latched/non-latched mode OVP

is triggered. The different behaviors of latched/non-

latched mode OVP is as follows :

⚫

The RT6310A/B/C/D provides output over-voltage

protection (OVP) with latched mode. Once OVP is

triggered, the IC stops PWM switching and enter

latched mode. If OVP event is released, users should

re-toggle the EN/MODE pin or power recycle VIN

supply to re-power on the device.

⚫

The RT6310AH/BH/CH/DH provides output over-

voltage protection (OVP) with non-latched mode.

Once OVP is triggered, the IC stops PWM switching

and enter non-latched mode. If the OVP condition is

released and the output voltage is lower than

regulation level, the device returns to regulate output

voltage.

Over-Temperature Protection (OTP)

The over-temperature protection of RT6310 includes

latched and non-latched mode. OTP circuitry prevents

device from overheating due to excessive power

dissipation. If the junction temperature of device

exceeds typical 150

C, the OTP is triggered to stop the

temperature rising. The behaviors of latched and non-

latched mode OTP is as follows :

⚫

The

RT6310A/B/C/D

provides

over-temperature

protection (OTP) with latched mode. Once OTP is

triggered, the IC stops PWM switching and enter

latched mode. If OTP event is released, users should

re-toggle the EN/MODE pin or power recycle VIN

supply to re-power on the device.

⚫

The

RT6310AH/BH/CH/DH

provides

over-

temperature protection (OTP) with non-latched mode.

Once OTP is triggered, the IC stops PWM switching

and

enter

non-latched

mode.

the

junction

temperature of device drops below typical 130

C , the

device enables the soft-start function to build the

output voltage.

RT6310A/AH 数据表(PDF) 13 Page - Richtek Technology Corporation

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