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ZY2140 40A No-Bus POL Data Sheet
8V to 14V Input ? 0.5V to 3.65V Output
9.
9.1
Application Information
Output Voltage Programming
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.
Resistance of the trim resistor is determined from the
equation below:
During normal operation the resistors are removed
from the circuit by the switches. The “Margining
R TRIM ?
20 ? ( 5 . 5 ? V OUT )
V OUT
, k ?
Down” switch is normally closed shorting the resistor
R DOWN while the “Margining Up” switch is normally
open disconnecting the resistor R UP .
where V OUT is the desired output voltage in Volts.
If the R TRIM is open or the TRIM pin is shorted to
PGND, the V OUT =0.5V.
9.2 Output Voltage Margining
Margining can be implemented by changing the
An alternative configuration of the margining circuit is
shown in Figure 13. In the configuration both
switches are normally open that may be
advantageous in some implementations.
POL
POL
R DOWN
resistance between the REF and TRIM pins.
Margining
Down Switch
(normally
closed)
MARGIN
Margining
Up Switch
(normally
open)
R UP R TRIM
TRIM
Margining
Up Switch
(normally
open)
R UP
Margining
Down Switch
(normally
open)
R TRIM
R DOWN
MARGIN
TRIM
GND
GND
Figure 12. Margining Configuration
Figure 13. Alternative Margining Configuration
R UP and R DOWN for this configuration are determined
from the following equations:
? ??
?? , k ?
In the schematic shown in Figure 12, the nominal
output voltage is set with the trim resistor R TRIM
calculated from the equation in the paragraph 9.1.
R UP ?
20 ? R TRIM
20 ? R TRIM
? 5 ? R TRIM ? ? V % ?
? ? V % ?
? ?
? 100 ? ? V % ?
? V %
Resistors R UP and R DOWN are added to margin the
output voltage up and down respectively and
determined from the equations below.
R DOWN ?
20 ? R TRIM
20 ? R TRIM
? ?
? , k ?
? ? ?
? ? , k ?
R UP ?
20 ? R TRIM
20 ? R TRIM
? 5 ? R TRIM ? ? V % ?
? ? 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
R DOWN ? ? 20 ? R TRIM ? ? ?
? , k ?
? ? V % ?
? 100 ? ? V % ?
pickup.
Refer to No-Bus TM POL Converters. Application
Note on www.power-one.com for more application
information on this and other product features.
ZD-02014 Rev. BB2, 30-Jun-10
www.power-one.com
Page 13 of 14
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