HBR Series of Railway Half-Brick
[Type text]
[Type text]
[Type text]
Up to 150 Watts DC-DC Converter
Output voltage trim down circuit
The recommend Resistor Values:
R3 (KΩ)
Vf (KΩ)
0
0.46
0.46
Vout (V) R1 (KΩ) R2 (KΩ)
VR (KΩ)
2.5
2.5
For HBR series, R trim_up is defined as:
5
2.32
9.1
20
3.3
51
0
5.1
6.2
12
24
130
2.5
Where:
1- R trim_up is the external resistor in KΩ.
2- V o_nom is the nominal output voltage.
3- Vo is the desired output voltage.
4- R1, R2, R3 and Vr are internal components.
For example: to trim-up the output voltage of the HBR113S12-12.5 module by 5% to 12.6V, R trim_up is calculated as follows:
Vo – V o_nom = 12.6 – 12 = 0.6V
R1 = 9.1 KΩ, R2 = 51 KΩ, R3 = 5.1KΩ, Vr= 2.5 V , Vf=0.46 V
On the other hand, R trim_down is defined as:
Where:
1- R trim_down is the external resistor in KΩ.
2- V o_nom is the nominal output voltage
3- Vo is the desired output voltage.
4- R1, R2, R3 and Vr are internal components.
For example: to trim-down the output voltage of the HBR113S12-12.5 module by 5% to 11.4V, R trim_down is calculated as follows:
Vo_nom – V o = 12 – 11.4 = 0.6 V
R1 = 9.1 KΩ, R2 = 51 KΩ, Vr = 2.5 V
September 16 -2017 A.04
Page 11 of 15
DATEL [ DATEL, Inc. ]
