LDM24 datasheet(2/4 Pages) MPD

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Model Selection Guide

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Typical Connection: DC/DC Input

Model

Number

Input

Output

Maximum

Power

(W)

Ripple &

Noise

(mV P-P, Max)

Efﬁciency

(%, Typ)

Package

Voltage (VDC)

Current

Range

Max (mA)

Accuracy (%)

LDM24-14-500

7.0 - 30.0

2.0 - 28.0

300

±10

450

14 -Pin MiniDIP

LDM24-17-600

7.0 - 30.0

2.0 - 28.0

500

±10

450

14 -Pin MiniDIP

LDM24-20-700

7.0 - 30.0

2.0 - 28.0

700

±10

450

14 -Pin MiniDIP

Notes:

1. A reversed power source could damage the unit.

4. The VADJ input should be left open if not used. Grounding VADJ will shut the unit

down. Connecting VADJ to VIN may damage the unit.

2. No connection should be made between input ground and the output.

3. These are step-down devices, the maximum output open voltage is

equal to the input voltage.

5. Exceeding the speciﬁed maximum output power could cause damage to the unit.

Typical Connection: AC/DC Input

Connection Notes:

To comply with EN61000-4-5, a TVS should be installed before the input ﬁlter components. A 3.0SMCJ24A or SMCJ24A is recommended. The TVS max clamping voltage (@max peak pulse

current VC) must be

40V. This will prevent any surge from exceeding the maximum input of the driver (40 VDC). Exceeding the maximum input rating could damage the driver.

The ﬁlter shown (C1, C2, C3 and L1) will help to meet conducted emission requirements. With the addition of the ﬁlter, the unit should meet the levels of EN 55015.

Connection Notes:

This is a distributed (or two-stage) AC connection. In this conﬁguration, the AC line in (85 to 264 VAC) is connected to the MPM-20S-24EPB, a compact 20W AC/DC

power supply. The MPM-20S-24EPB provides a tightly regulated 24 VDC output at 833 mA. The 24 VDC output powers the LED driver.

The two stage approach can simplify the safety approval process (most AC/DC power supplies on the market are approved to EN 60950) and may increase design ﬂex-

ibility. Besides the output voltage/current ratings, other speciﬁcations to consider when selecting the input AC/DC supply might include input range, case size, efﬁciency,

EMI ratings and operating temperature range.

Note: The output current adjustment circuit shown in both connection diagrams is discussed on page 4.

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