Datasheet > SGM2523A/B

SGM2523A/B

更新时间： 2024-04-09 18:59:12

品牌	Logo	应用领域
圣邦微 - SGMICRO		/
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16页	937K
描述
Programmable Current Limit Switch

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SGM2523A/B 数据手册

SGM2523

Programmable Current Limit Switch

SYSTEM EXAMPLES

During short-circuit fault, the internal fast comparator

shuts down the FET within 0.3μs after the input current

increases rapidly and exceeds I_FAST-TRIPwhich is set by

the external R_ILIMresistor.

Protection and Current Limit for AC/DC

Power Supplies

In many small household appliances, portable devices,

consumer products and other application scenarios, the

primary-side power supplies and adapter are dominant.

These power supplies generally have a rated power of

5W - 30W, which is generally characterized by high

efficiency, low cost and few components. However,

there are also the following shortcomings:

Furthermore, the SGM2523 provides inrush current limit

during the output ramp up procedure.

Precision Current Limit in Intrinsic Safety

Applications

• No secondary-side protection which can stop short-

circuit and other key faults immediately.

• Cannot provide precision current limit for overload

transients.

• Poor ability to regulate the output voltage during

sudden fluctuation of the AC input voltage, when the

output over-voltage condition is triggered.

The safe operation of electrical and electronic

equipment in dangerous area environment has a more

and more urgent requirements for intensive safety (IS).

IS requires that the total energy available during

equipment operation is not enough to ignite the

surrounding explosive environment by means of

electric sparks or heat transfer. This requires precision

current limits to ensure that the set current limits are not

exceeded over a wide operating temperature range and

variable environmental conditions. Applications such as

gas analyzers, medical devices, portal industrial

equipment, etc., need to meet these importance safety

standards. As a simple over-voltage and over-load

protection solution, SGM2523 is applicable to each

power rail inside the system application. The typical

implementation circuit of SGM2523 is shown in Figure

10.

Therefore, accurate current sensing and overload

protection are required for the secondary side output

port in the above applications. This requires the use of

precision operational amplifiers for additional circuit

implementation. It adds complexity to the solution and

leads to a loss of sensing. The SGM2523 adopting

N-MOSFET with low on-resistance is a simple and

efficient solution. The typical application circuit of

SGM2523 is shown in Figure 9.

V_OUT

SGM2523

ILIM

C_B2

C_B1

N_P

N_S

C_O

R_ILIM

V_AC

UVV287XX

Primary Regulator

Fly-Back Controller

R_S

Figure 9. Current Limit and Protection for AC/DC Power Supplies

L_O

Sync Buck

DC/DC

V_OUT

V_IN

SGM2523

LDO

SGM2523

Converter

ILIM

C_B

C_O

R_ILIM

Figure 10. Precision Current Limit and Protection of Internal Rails

SG Micro Corp

www.sg-micro.com

JANUARY 2023

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