IPM datasheet(8/15 Pages) DELTA

8 / 15 page

DS_IPM12S0A008_03202007

DESIGN CONSIDERATIONS

Safety Considerations

For safety-agency approval the power module must be

installed in compliance with the spacing and separation

requirements of the end-use safety agency standards.

For the converter output to be considered meeting the

requirements of safety extra-low voltage (SELV), the

input must meet SELV requirements. The power module

has extra-low voltage (ELV) outputs when all inputs are

ELV.

The input to these units is to be provided with a

maximum 10A time-delay fuse in the ungrounded lead.

Remote On/Off

The IPM series power modules have an On/Off control

pin for output voltage remote On/Off operation. The

On/Off pin is an open collector/drain logic input signal

that is referenced to ground. When On/Off control pin is

not used, leave the pin unconnected.

The remote on/off pin is internally connected to +Vin

through an internal pull-up resistor. Figure 27 shows the

circuit configuration for applying the remote on/off pin.

The module will execute a soft start ON when the

transistor Q1 is in the off state.

The typical rise for this remote on/off pin at the output

voltage of 2.5V and 5.0V are shown in Figure 17 and 18.

On/Off

Vin

GND

IPM

Figure 27: Remote on/off implementation

FEATURES DESCRIPTIONS

Over-Current Protection

To provide protection in an output over load fault

condition, the unit is equipped with internal over-current

protection.

When

the

over-current

protection

triggered, the unit enters hiccup mode. The units

operate normally once the fault condition is removed.

Pre-Bias Startup Capability

The IPM would perform the monotonic startup into the

pre-bias loads; so as to avoid a system voltage drop

occur upon application. In complex digital systems an

external voltage can sometimes be presented at the

output of the module during power on. This voltage may

be feedback through a multi-supply logic component,

such as FPGA or ASIC. Another way might be via a clamp

diode as part of a power up sequencing implementation.

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