Delta Electronics 6A Series manual Voltage Margining Adjustment, Output Capacitance

FEATURES DESCRIPTIONS (CON.)

Voltage Margining Adjustment

Output voltage margin adjusting can be implemented in the NE modules by connecting a resistor, Rmargin-up, from the Trim pin to the Ground for margining up the output voltage. Also, the output voltage can be adjusted lower by connecting a resistor, Rmargin-down, from the Trim pin to the voltage source Vt. Figure 23 shows the circuit configuration for output voltage margining adjustment.

Vt

Output Capacitance

There is internal output capacitor on the NE series modules. Hence, no external output capacitor is required for stable operation.

Reflected Ripple Current and Output Ripple and Noise Measurement

The measurement set-up outlined in Figure 24 has been used for both input reflected/ terminal ripple current and output voltage ripple and noise measurements on NE series converters.

NDNE6A/10A6A/10A

Vin Vout

Trim

Enable

Ground Ground

Rs

Rmargin-down

Rmargin-up

Input reflected current measurement point

Ltest		DC-DC Converter
Vin+			Load
Cs	Cin	1uF	10uF
		Ceramic	Tan

Output voltage ripple noise measurement point

Figure 23: Circuit configuration for output voltage margining

Paralleling

NE06 converters do not have built-in current sharing (paralleling) ability. Hence, paralleling of multiple NE06 converters is not recommended.

DS_NE12S06A_06302008

Cs=270μF*1, Ltest=2uH, Cin=270μF*1

Figure 24: Input reflected ripple/ capacitor ripple current and output voltage ripple and noise measurement setup for NE06

8