ZY2105 5A No-Bus POL Data Sheet
8V to 14V Input ? 0.5V to 5.5V Output
where R TRIM is the value of the trim resistor in k ? and
Δ V% is the absolute value of desired margining
expressed in percents of the nominal output voltage.
During normal operation the resistors are removed
from the circuit by the switches. The “Margining
Figure 14. Alternative Margining Configuration
R UP and R DOWN for this configuration are determined
from the following equations:
? ? ?
? ? , k ?
Down” switch is normally closed shorting the resistor
R DOWN while the “Margining Up” switch is normally
open disconnecting the resistor R UP .
R UP ?
20 ? R TRIM
20 ? R TRIM
? 5 ? R TRIM ? ? V % ?
? ? V % ?
? ?
? 100 ? ? V % ?
? V %
An alternative configuration of the margining circuit is
shown in Figure 14. In the configuration both
switches are normally open that may be
R DOWN ?
20 ? R TRIM
20 ? R TRIM
? ?
? , k ?
advantageous in some implementations.
POL
Caution :
Noise injected into the TRIM node may affect accuracy
of the output voltage and stability of the POL
converter. Always minimize the PCB trace length from
the TRIM pin to external components to avoid noise
pickup.
Margining
Up Switch
(normally
open)
R TRIM
MARGIN
Refer to No-Bus TM POL Converters. Application
Note on www.power-one.com for more application
information on this and other product features.
R UP
TRIM
R DOWN
Margining
Down Switch
(normally
open)
GND
ZD-01967 Rev. B1.2
www.power-one.com
Page 13 of 14
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