IPM datasheet(7/15 Pages) DELTA

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DS_IPM12S0A008_03202007

TEST CONFIGURATIONS

VI(+)

VI(-)

BATTERY

2 47uF

Tantalum

Note: Input reflected-ripple current is measured with a

simulated

source

inductance.

Current

measured at the input of the module.

Figure 23: Input reflected-ripple current test setup

GND

10uF

tantalum

1uF

ceramic

SCOPE

Resistive

Load

Note: Use a 10μF tantalum and 1μF capacitor. Scope

measurement should be made using a BNC

connector.

Figure 24: Peak-peak output noise and startup transient

measurement test setup

GND

Figure 25: Output voltage and efficiency measurement test

setup

Note: All measurements are taken at the module

terminals. When the module is not soldered (via

socket), place Kelvin connections at module

terminals to avoid measurement errors due to

contact resistance.

100

)

(







DESIGN CONSIDERATIONS

Input Source Impedance

To maintain low-noise and ripple at the input voltage, it is

critical to use low ESR capacitors at the input to the

module. Figure 26 shows the input ripple voltage

(mVp-p) for various output models using 2x47 uF low

ESR tantalum capacitors (SANYO P/N:16TPB470M,

47uF/16V or equivalent) or 2x22 uF very low ESR

ceramic

capacitors

(TDK

P/N:C3225X7S1C226MT,

22uF/16V or equivalent).

The input capacitance should be able to handle an AC

ripple current of at least:

Arms

Vin

Vout

Vin

Vout

Iout

Irms











 



100

150

200

250

300

350

400

Output Voltage (Vdc)

Tantalum

Ceramic

Figure 26: Input ripple voltage for various output models,

Io = 8A (Cin = 2x47uF tantalum capacitors or

2x22uF ceramic capacitors at the input)

The power module should be connected to a low

ac-impedance input source. Highly inductive source

impedances can affect the stability of the module. An

input capacitance must be placed close to the modules

input pins to filter ripple current and ensure module

stability in the presence of inductive traces that supply

the input voltage to the module.

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