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ZY1207 7A No-Bus POL Data Sheet
3V to 14V Input ? 0.5V to 5.5V Output
8.15 +VS
The positive 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 .
9.1
Output Voltage Margining
An alternative configuration of the margining circuit is
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.
shown in Figure 20. In this configuration both
switches are normally open that may be
advantageous in some implementations.
Margining
Up Switch
(normally
open)
Margining
Down Switch
(normally
closed)
R DOWN
REF
POL
Margining
Up Switch
(normally
open)
R UP
R TRIM
REF
TRIM
POL
R UP
R TRIM
R DOWN
TRIM
Margining
Down Switch
(normally
open)
PGND
PGND
Figure 20. Alternative Margining Configuration
Figure 19. Margining Configuration
In the schematic shown in Figure 19, the nominal
R UP and R DOWN for this configuration are determined
from the following equations:
? ? ?
? ? , k ?
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 UP ?
20 ? R TRIM
20 ? R TRIM
? 5 ? R TRIM ? ? V % ?
? ? V % ?
20 ? R TRIM ? 5 ? R TRIM ? ? V % ?
20 ? R TRIM
R UP ? ? ?? ?? , k ?
R DOWN ?
20 ? R TRIM ? 100 ? ? V % ?
R DOWN ? ? 20 ? R TRIM ? ? ?
? , k ?
determined from the equations below.
? ? V % ?
? ? 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.
? ? ? , k ?
20 ? R TRIM ? ? V % ?
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.
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-00697 Rev. 1.9, 24-Jun-10
www.power-one.com
Page 15 of 18
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