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ASQ24 DC-DC Converter Series Data Sheet
18 to 36 VDC Input; 1.0 to 12 VDC Output
the maximum current (originally obtained from the derating
Semi Q Family
curves) by the same percentage to ensure the converter’s
actual output power remains at or below the maximum al-
lowable output power.
Vin
Vin (+)
ON/OFF
TM
Converter
(Top View)
Vout (+)
SENSE (+)
TRIM
R T-INCR
Rload
Output Voltage Adjust /TRIM (Pin 6)
The converter’s output voltage can be adjusted up 10% or
Vin (-)
SENSE (-)
Vout (-)
[k ? ]
R T ? DECR ?
? 10.22
(1.0 – 12V)
down 20% for Vout ≥ 1.5 V, and ± 10% for Vout = 1.2 V and
1.0 V, relative to the rated output voltage by the addition of
an externally connected resistor. For output voltages 3.3 V,
trim up to 10% is guaranteed only at Vin ≥ 20 V, and it is
marginal (8% to 10%) at Vin = 18 V depending on load cur-
rent.
The TRIM pin should be left open if trimming is not being
used. To minimize noise pickup, a 0.1 μF capacitor is con-
nected internally between the TRIM and SENSE(-) pins.
To increase the output voltage, refer to Fig. C. A trim resis-
tor, R T-INCR , should be connected between the TRIM (Pin 6)
and SENSE(+) (Pin 7), with a value of:
Fig. C: Configuration for increasing output voltage .
To decrease the output voltage (Fig. D), a trim resistor, R T-
DECR , should be connected between the TRIM (Pin 6) and
SENSE(-) (Pin 5), with a value of:
511
| Δ |
where,
R T ? DECR ? Required value of trim-down resistor [k ? ]
and Δ is as defined above.
Note: The above equations for calculation of trim resistor
values match those typically used in conventional industry-
R T ? INCR ?
5.11(100 ? Δ )V O ? NOM ? 626
1.225 Δ
? 10.22 [k ? ] (1.5 –12V)
standard quarter bricks and one-eighth bricks.
Converters with output voltage 1.2 V and 1.0 V have specific
trim schematic and equations, to provide the customers with
Semi Q Family
R T ? INCR ?
R T ? INCR ?
where,
485
Δ
323
Δ
? 2
[k ? ] (1.2V)
[k ? ] (1.0V)
the flexibility of second sourcing. For these converters, the
last character of part number is “T”. More information about
trim feature, including corresponding schematic portions, can
be found in Application Note 103.
TM
Vin (+)
Vout (+)
Converter
R T ? INCR ? Required value of trim-up resistor k ? ]
(Top View)
SENSE (+)
V O ? NOM ? Nominal value of output voltage [V]
(V O -REQ ? V O -NOM )
Δ ?
X 100 [%]
V O - NOM
Vin
ON/OFF
Vin (-)
TRIM
SENSE (-)
Vout (-)
R T-DECR
Rload
V O ? REQ ? Desired (trimmed) output voltage [V].
When trimming up, care must be taken not to exceed the
converter‘s maximum allowable output power. See previous
section for a complete discussion of this requirement.
Fig. D: Configuration for decreasing output voltage.
Trimming/sensing beyond 110% of the rated output voltage
is not an acceptable design practice, as this condition could
cause unwanted triggering of the output overvoltage protec-
tion (OVP) circuit. The designer should ensure that the dif-
ference between the voltages across the converter’s output
pins and its sense pins does not exceed 10% of V OUT ( NOM ) ,
or:
[V OUT ( ? ) ? V OUT ( ? )] ? [V SENSE ( ? ) ? V SENSE ( ? )] ? V O - NOM X 10% [V]
This equation is applicable for any condition of output sens-
ing and/or output trim.
MCD10004 Rev. 1.4, 10-Jun-10
Page 4 of 70
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