2 YEAR WARRANTY

SMT40C Series

12 Vin single output

All specifications are typical at nominal input Vin = 12 V, full load at 25 °C unless otherwise stated

SPECIFICATIONS

File Name: smt40c.pdf Rev (04): 16 Dec 2005

DC-DC CONVERTERS

C Class Non-isolated

1

per Telcordia SR-332

The SMT40C Series is a new high density open frame non-isolated converter for space-

sensitive applications. Each model has a wide input range o

f 10.2 Vdc to 13.8 Vdc and offers

a wide

0.9 Vdc to 5.0 Vdc output voltage range with a 40 A load. An external resistor adjusts

the output voltage from its pre-set value of 0.9 V to any value up to 5 V. Typical efficiencies are

92% at full load conditions. The SMT40C series offers remote ON/OFF and overcurrent

protection as standard. With full international safety approval including EN60950 and

UL/cUL60950, the SMT40C reduces compliance costs and time to market.

NEW Product

OUTPUT SPECIFICATIONS

Voltage adjustability

(See Note 5)

0.9-5.0 Vdc

Output setpoint accuracy 1.0% trim resistors

±3.0%

Line regulation

Low line to high line

±0.2% max.

Load regulation

Full load to min. load

±1.5% max.

Min/max load

0 A/40 A

Overshoot

At turn-on

1.0% max.

Undershoot

At turn-off

100 mV max.

Ripple and noise

(See Note 1)

50 mV pk-pk

5 Hz to 20 MHz

15 mV rms

Transient response

75 mV max. deviation

(See Note 2)

50 µs recovery to

within regulation band

Current share

Full load

±10%

INPUT SPECIFICATIONS

Input voltage range

10.2-13.8 Vdc

Input current

Minimum load

290 mA

Remote OFF

30 mA

Input current (max.)

22 A max @ lo max

and Vin = 10.2 V

Input reflected ripple

(See Note 4)

150 mA pk-pk

Remote ON/OFF

Logic compatibility

Positive logic

ON

>2.4 Vdc

OFF

<0.8 Vdc

Start-up time

Power up

<30 ms

(See Note 8)

Remote ON/OFF

<30 ms

Turn ON threshold

9.0 Vdc typ.

Turn OFF threshold

7.6 Vdc typ.

International Safety Standard Approvals

UL/cUL CAN/CSA 22.2 No. 60950

UL 60950 File No. E139421

TÜV Product Service (EN60950:2000)

Certificate No. B 04 08 19870 228

CB report and certificate to IEC60950-US/6415C/UL

GENERAL SPECIFICATIONS

Efficiency

92% typ.

Switching frequency

Fixed

300 kHz typ.

Approvals and

(See Note 7)

TÜV Product Services

standards

IEC60950, UL/cUL60950

Material flammability

UL94V-0

Weight

28.3 g (1.0 oz)

Coplanarity

150 µm

MTBF

Telcordia SR-332,

4,585,991 hours

method II @ 40 ºC

ENVIRONMENTAL SPECIFICATIONS

Thermal performance

Operating ambient,

0 ºC to +80 ºC

(See Note 9)

temperature

Non-operating

-40 ºC to +125 ºC

PROTECTION

Short-circuit

Foldback, non-latching

Over-temperature

Hiccup, non-latching

RECOMMENDED SYSTEM CAPACITANCE

Input capacitance

(See Note 10) 2 x 270 µF/20 m

Output capacitance

(See Note 10) 3 x 680 µF/10 m