FEATURES DESCRIPTIONS (CON.)

The ENABLE input can be driven in a variety of ways as shown in Figures 19 and 20. If the ENABLE signal comes from the primary side of the circuit, the ENABLE can be driven through either a bipolar signal transistor (Figure 18).If the enable signal comes from the secondary side, then an opto-coupler or other isolation devices must be used to bring the signal across the voltage isolation (please see Figure 19).

 

NE20A

Vin

Vout

 

Enable Trim

Ground Ground

Figure 19: Enable Input drive circuit for NE series

NE20A

 

Vin

Vout

 

Enable

Trim

 

Ground Ground

Figure 20: Enable input drive circuit example with isolation.

Input Under-Voltage Lockout

The input under-voltage lockout prevents the converter from being damaged while operating when the input voltage is too low. The lockout occurs between 3.3V to 4.3V.

Over-Current and Short-Circuit Protection

The NE series modules have non-latching over-current and short-circuit protection circuitry. When over current condition occurs, the module goes into the non-latching hiccup mode. When the over-current condition is removed, the module will resume normal operation.

An over current condition is detected by measuring the voltage drop across the MOSFETs. The voltage drop across the MOSFET is also a function of the MOSFET’s Rds(on). Rds(on) is affected by temperature, therefore ambient temperature will affect the current limit inception point.

The detection of the Rds(on) of MOSFETs also acts as an over temperature protection since high temperature will cause the Rds(on) of the MOSFETs to increase, eventually triggering over-current protection.

Preliminary DS_NE12S20A_07272007

Output Voltage Programming

The output voltage of the NE series is trimmable by connecting an external resistor between the trim pin and output ground as shown Figure 21 and the typical trim resistor values are shown in Table 1.

ND 6A/10A

NE20A

Vin Vout

Trim

Enable

Rs

Ground Ground

Figure 21: Trimming Output Voltage

The NE20 module has a trim range of 0.59V to 5.0V. The trim resistor equation for the NE20A is:

Rs(Ω) = 1182

Vout − 0.591

Vout is the output voltage setpoint

Rs is the resistance between Trim and Ground Rs values should not be less than 240Ω

Output Voltage

Rs (Ω)

0.59V

open

+1 V

2.4k

+1.5 V

1.3K

+2.5 V

619

+3.3 V

436

+5.0V

268

Table 1: Typical trim resistor values

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Delta Electronics 20A Features Descriptions CON, Input Under-Voltage Lockout, Over-Current and Short-Circuit Protection
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0.59V~5.1Vout, 20A, 4.5V~13.8Vin specifications

Delta Electronics has established itself as a leader in the power supply sector, and their latest offering, a versatile DC-DC converter, epitomizes the company's commitment to innovation and efficiency. This device operates within an input voltage range of 4.5V to 13.8V and provides a robust output current of 20A, making it suitable for a wide range of applications.

One of the key features of this DC-DC converter is its adjustable output voltage, which can be configured between 0.59V and 5.1V. This adaptability allows it to cater to diverse voltage requirements for various electronic components and systems. Additionally, the converter benefits from high efficiency, often exceeding 90%, which minimizes thermal generation and extends the lifespan of electronic systems.

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In summary, Delta Electronics' 4.5V~13.8Vin, 20A, 0.59V~5.1Vout DC-DC converter stands out due to its adjustable output voltage, high efficiency, robust protection features, and compact design. Its reliable performance and versatile application capabilities are a testament to Delta's dedication to providing high-quality power solutions that meet the evolving demands of the electronics industry. Whether utilized in industrial automation, telecommunications, or consumer electronics, this converter is poised to deliver exceptional performance and efficiency.
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