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ZY1015 15A No-Bus POL Data Sheet
3V to 14V Input ? 0.5V to 5.5V Output
Note : Due to noise sensitivity issues that may occur in limited
cases, it is recommended to avoid phase lag settings of
112.5 and 123.75 degrees, otherwise false PG and/or OV
indications may occur.
8.15 –VS and +VS
The differential voltage input of the POL converter
feedback loop.
9. Application Information
During normal operation the resistors are removed
from the circuit by the switches. The “Margining
Down” switch is normally closed shorting the resistor
R DOWN while the “Margining Up” switch is normally
open disconnecting the resistor R UP .
An alternative configuration of the margining circuit is
shown in Figure 19. In the configuration both
switches are normally open that may be
9.1
Output Voltage Margining
advantageous in some implementations.
POL
Margining can be implemented either by changing
the trim voltage as described in the previous
paragraph or by changing the resistance between
the REF and TRIM pins.
Margining
Down Switch
(normally
closed)
Margining
Up Switch
(normally
open)
R UP
R TRIM
REF
TRIM
POL
Margining
Up Switch
(normally
open)
R UP
R DOWN
R TRIM
REF
Margining
Down Switch
(normally
open)
R DOWN
PGND
TRIM
Figure 19. Alternative Margining Configuration
PGND
R UP and R DOWN for this configuration are determined
from the following equations:
? ? ?
? ? , k ?
Figure 18. Margining Configuration
In the schematic shown in Figure 18, the nominal
R UP ?
20 ? R TRIM
20 ? R TRIM
? 5 ? R TRIM ? ? V % ?
? ? V % ?
? ?
? 100 ? ? V % ?
? V %
output voltage is set with the trim resistor R TRIM
calculated from the equation in the paragraph 8.12.
Resistors R UP and R DOWN are added to margin the
output voltage up and down respectively and
R DOWN ?
20 ? R TRIM
20 ? R TRIM
? ?
? , k ?
determined from the equations below.
Caution :
Noise injected into the TRIM node may affect accuracy
of the output voltage and stability of the POL
? ? ?
? ? , k ?
R UP ?
20 ? R TRIM
20 ? R TRIM
? 5 ? R TRIM ? ? V % ?
? ? V % ?
converter. Always minimize the PCB trace length from
the TRIM pin to external components to avoid noise
pickup.
R DOWN ? ? 20 ? R TRIM ? ? ?
? , k ?
? ? V % ?
? 100 ? ? V % ?
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.
Refer to No-Bus TM POL Converters. Z-1000 Series
Application Note on www.power-one.com for more
application information on this and other product
features.
ZD-00993 Rev. 1.6, 24-Jun-10
www.power-one.com
Page 15 of 17
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