Output Voltage Programming, Example：

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Output Voltage Programming

The output voltage of the NC series is trimmable by connecting an external resistor between the trim pin and output ground as shown Figure 31 and the typical trim resistor values are shown in Figure 32. The output can also be set by an external voltage connected to trim pin as shown in Figure 32.

The NC30A/40A module has a trim range of 0.9V to 5.0V. A plot of trim behavior is shown in Figure 33

+SENSE

Vout

Cout

GROUND -SENSE

TRIM

Figure 31: Trimming Output Voltage

The NC30/NC40 modules have a trim range of 0.9V to 5.0V. The trim resistor equation for the them is :

Rs (kΩ) = 12.69 − Vout

Vout − 0.9

Vout is the desired voltage setpoint,

Rs is the trim resistance between TRIM and Ground, Rs values should not be less than 1.8 kΩ

Output Voltage	Rs(Ω)
+0.9 V	OPEN
+1.2 V	38.3K
+1.5 V	18.7K
+1.8 V	12.1K
+2.5 V	6.34K
+3.3 V	3.92K
+5.0 V	1.87K

Figure 32: Typical trim resistor values

+SENSE

Vout

Cout

GROUND -SENSE

TRIM Vt

Figure 33: Output voltage trim with voltage source

DS_NC12S30A_05222008

To use voltage trim, the trim equation for the NC30 is (please refer to Fig. 33) :

Rt(kΩ) =	Rs(13.1Vt + Vout − 12.69)
	0.9Rs − Vout(Rs + 1) + 12.69

Vout is the desired output voltage Vt is the external trim voltage

Rs is the resistance between Trim and Ground (in KΩ)

Rt is the resistor to be defined with the trim voltage (in KΩ)

Below is an example about using this voltage trim equation :

Example：

If Vt = 1.25V, desired Vout = 2.5V and Rs = 1 kΩ

Rt(kΩ) =	Rs(13.1Vt + Vout − 12.69)	= 0.72kΩ
	0.9Rs − Vout(Rs + 1) + 12.69

Power Good

The converter provides an open collector signal called Power Good. This output pin uses positive logic and is open collector. This power good output is able to sink 5mA and set high when the output is within ±10% of output set point. The power good signal is pulled low when output is not within ±10% of Vout or Enable is OFF.

Output Capacitance

There is no output capacitor on the NC series modules. Hence, an external output capacitor is required for stable operation. For NC30 modules, two external 6.3V/680μF output low ESR capacitors in parallel (for example, OSCON) are required for stable operation.

It is important to places these low ESR capacitors as close to the load as possible in order to get improved dynamic response and better voltage regulation, especially when the load current is large. Several of these low ESR capacitors could be used together to further lower the ESR.

Please refer to individual datasheet for the maximum allowed start-up load capacitance for each NC series as it is varied between series.

NC30 specifications

Delta Electronics NC30: A Comprehensive Overview

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