ACT4910QW datasheet(20/34 Pages) ACTIVE-SEMI

Numer części	ACT4910QW

Szczegółowy opis	Power Loss Protection with 6A eFuse

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Producent	ACTIVE-SEMI [Active-Semi, Inc]

Strona internetowa	http://www.active-semi.com

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20 / 34 page

ACT4910QW

Rev 1.0, 15-Sept-2017

Innovative PowerTM

www.active-semi.com

ActiveSwitcherTM is a trademark of Active-Semi

20

EFUSE

General Description

The ACT4910 eFuse is an “electronic” fuse that

disconnects the input from the output. It has

considerable advantages over mechanical fuses

because it has adjustable current thresholds and it

resets after the fault condition is gone. The eFuse

consists of two back-to-back MOSFETS to provide bi-

directional protection. This provides protection against

both input and output short circuit conditions by

preventing current flow in both directions. Hot swap

functionality is provided by the eFuse softstart function

and current limiting circuitry. This prevents large inrush

currents from pulling down the input voltage. The eFuse

also provides protection against high input voltage

transients up to 24V by opening when the input voltage

goes above the programmed threshold.

The eFuse turns off in the following conditions.

1. EN voltage below UV threshold

2. EN voltage above the OV threshold

3. Input voltage above the OV threshold

4. eFuse current above the OC threshold

5. VIN – VOUT > 560mV

Current Limit Setting

A resistor connected between the ISET pin and VSS

program the ACT4910 eFuse inrush and maximum DC

current limits. The input current limit is linearly

proportional to the resistor value on the ISET pin. The

following equation calculates the correct resistor value

to get the desired current limit threshold.

Equation (1)

Where RILIM is the current limit resistor in ohms and IILIM

is the desired current limit threshold in Amperes. Figure

5 shows the current limit setting vs RILIM value.

Figure 5: Current Limit Threshold vs RILIM

Note that the eFuse current can be measured using the

ILIM pin. If eFuse current is measured via the ILIM pin,

the measurement circuit must have a high impedance

input to minimize errors. The current flowing out of ILIM

is 1/50000 of the current through the eFuse. The

following equation calculates the eFuse current when

measured via the ILIM pin.

∗

Equation (2)

Where RILIM is the current limit resistor in ohms and VILIM

is the voltage on the ILIM pin in volts.

When the eFuse reaches the current limit threshold, it

clamps the output current. If the load tries to draw

additional current, the eFuse opens.

Soft-Start

The SS pin controls the eFuse start-up. The SS pin

drives a constant 5μA internal current source into the

external soft-start capacitor to provide a linear ramping

voltage at the SS pin. The output voltage linearly ramps

with the SS pin voltage, resulting in a well-controlled

linear softstart ramp on VOUT, regardless of the load

conditions. The following equation calculates the

required soft-start capacitance.

Equation 2

Where the TSS is the soft-start time in ms and VOUT is the

output voltage.

The softstart current must be less than 90% of the

programmed eFuse current limit. If the softstart current

is greater than 90% of the eFuse current limit, the IC

enters the SHUTDOWN2 state, turns off the eFuse, and

0.000

2.000

4.000

6.000

8.000

10.000

12.000

14.000

0

102030405060

RISET (kΩ)

Podobny numer części - ACT4910QW

Producent	Numer części	Arkusz danych	Szczegółowy opis
Active-Semi, Inc	ACT4911QW	3Mb / 33P	Power Loss Protection with 6A eFuse Rev 1.0, 15-Sept-2017
Active-Semi, Inc	ACT4911QW301-T	3Mb / 33P	Power Loss Protection with 6A eFuse Rev 1.0, 15-Sept-2017

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Podobny opis - ACT4910QW

Producent	Numer części	Arkusz danych	Szczegółowy opis
Active-Semi, Inc	ACT4911QW	3Mb / 33P	Power Loss Protection with 6A eFuse Rev 1.0, 15-Sept-2017
Active-Semi, Inc	ACT4921QI	3Mb / 35P	Power Loss Protection with 6A eFuse Rev 1.0, 18-Jan-2018
Texas Instruments	TPS25942A	3Mb / 54P	[Old version datasheet] 5A eFuse Power MUX with Multiple Protection Modes
Analog Devices	MAX17527A	1Mb / 32P	5.5V to 60V, 6A Power Limiter with OV, UV, Reverse Polarity, Loss of Ground Protection Rev 0; 11/22
Littelfuse	LS2406ERQ23	1Mb / 14P	28V, 6A eFuse with True Reverse Blocking and Fast Role Swap GD. 09/26/22
Littelfuse	LS24062RQ23	1Mb / 16P	28V 6A Bidirectional eFuse with Dual Port Independent Current Limit Setting 2022 Littelfuse, Inc.
Texas Instruments	TPS25940-Q1	3Mb / 46P	[Old version datasheet] 18-V eFuse with Integrated Short-to-Battery Protection
	TPS259250	1Mb / 35P	[Old version datasheet] Simple 5V/12V eFuse Protection Switches
	TPS2663	4Mb / 52P	[Old version datasheet] 60-V, 6-A Power limiting, surge protection industrial eFuse
	TPS259230	1Mb / 33P	[Old version datasheet] 5V eFuse with Over Voltage Protection and Blocking FET Control

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