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QM48T45 Family DC-DC Converter Data Sheet
36-75 VDC Input; 1.0-3.3 VDC @ 45 A Output
current (originally obtained from the derating curves)
by the same percentage to ensure the converter’s
actual output power remains at or below the
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:
maximum allowable output power.
Output Voltage Adjust /TRIM (Pin 6)
The output voltage can be adjusted up 10% or 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
3.3 V output voltage, trim up to 10% is guaranteed
only at Vin ≥ 40 V, and it is marginal (8% to 10%) at
R T ? DECR =
R T ? DECR =
R T ? DECR =
511
| Δ |
700
| Δ |
700
| Δ |
? 10.22
? 15
? 17
[k ? ] (3.3-1.5 V)
[k ? ] (1.2 V)
[k ? ] (1.0 V)
Vin = 36 V.
The TRIM pin should be left open if trimming is not
being used. To minimize noise pickup, a 0.1μF
capacitor is connected internally between the TRIM
and SENSE(-) pins.
To increase the output voltage, refer to Fig. C. A trim
resistor, R T-INCR , should be connected between the
TRIM (Pin 6) and SENSE(+) (Pin 7), with a value of:
where,
R T ? DECR = Required value of trim-down resistor [k ? ]
and Δ is defined above.
Note:
The above equations for calculation of trim resistor values match
those typically used in conventional industry-standard quarter-
bricks (except for 1.2 V and 1.0 V outputs).
R T ? INCR =
QmaX
Series
5.11(100 + Δ )V O ? NOM ? 626
1.225 Δ
(For 3.3-1.5 V)
? 10.22
[k ? ]
Vin (+)
TM
Converter
Vout (+)
R T ? INCR =
84.6
Δ
? 7.2
[k ? ]
(1.2 V)
Vin
ON/ OFF
(Top View)
SENSE(+)
TRIM
SENSE (-)
R T- DECR
Rload
R T ? INCR =
120
Δ
? 9
[k ? ] (1.0 V)
Vin (-)
Vout (-)
where,
R T ? INCR = Required value of trim-up resistor [k ? ]
V O ? NOM = Nominal value of output voltage [V]
Fig. D: Configuration for decreasing output voltage.
Trimming/sensing beyond 110% of the rated output
voltage is not an acceptable design practice, as this
Δ =
(V O - REQ ? V O - NOM )
V O - NOM
X 100
[%]
condition could cause unwanted triggering of the
output overvoltage protection (OVP) circuit. The
designer should ensure that the difference between
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 the previous section for a complete discussion of
this requirement.
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
sensing and/or output trim.
QmaX
Series
Vin (+)
TM
Converter
Vout (+)
(Top View)
SENSE(+)
R T- INCR
Vin
ON/ OFF
TRIM
Rload
SENSE (-)
Vin(-)
Vout (-)
Fig. C: Configuration for increasing output voltage.
MCD10073 Rev. 1.0
Page 4 of 36
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