SLTS092B datasheet(2/9 Pages) TI

2 / 9 page

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PT4120 Series

20-W 48-V Input Isolated

DC/DC Converter

Specifications (Unless otherwise stated, Ta =25°C, Vin =48V, Cout =0µF, and Io =Iomax)

PT4120 SERIES

Characteristic

Symbol

Conditions

Min

Typ

Max

Units

Output Current

Over Vin range

Vo = 15V

0.1 (1)

—

1.3

Vo = 12V

0.1 (1)

—

1.6

Vo =5.0V

0.1 (1)

—

4.0

Vo ≤ 3.3V

0.1 (1)

—

5.0

Input Voltage Range

Vin

Over Io Range

36.0

48.0

75.0

VDC

Set Point Voltage Tolerance

Vo tol

Vo≥5.0V

—

±1

±1.5

%Vo

Vo≤3.3V

—

±50

Temperature Variation

Regtemp

–40°

≤Ta ≤ +85°C

—

±0.5

—

%Vo

Line Regulation

Regline

Over Vin range

Vo≥5.0V

—

±0.2

±1.0

%Vo

Vo≤3.3V

—

±7

±33

Load Regulation

Regload

Over Io range

≥5.0V

—

±0.4

±1.0

%Vo

Vo≤3.3V

—

±13

±33

Total Output Voltage Variation

∆Votot

Includes set-point, line load,

Vo≥5.0V

—

±2

—

%Vo

–40°

≤Ta ≤ +85°C

Vo≤3.3V

—

±67

—

Efficiency

Vo = 15V

—

Vo = 12V

—

Vo =5.0V

—

Vo =3.3V

—

Vo =1.8V

—

Vo Ripple (pk-pk)

20MHz bandwidth

Vo ≥ 5.0V

—

0.5

—

%Vo

Vo ≤ 3.3V

—

mVpp

Transient Response

ttr

0.1A/µs, load step 50% to 100% Iomax

—

100

—

µs

∆Vtr

Vo over/undershoot

Vo ≥ 5.0V

—

±3.0

—

%Vo

Vo ≤ 3.3V

—

±150

—

Short Circuit Current

Isc

—

2xIomax

—

Switching Frequency

ƒs

Over Vin range

Vo≥ 12.0V

600

650

700

kHz

Vo ≤ 5.2V

800

850

900

Under-Voltage Lockout

UVLO

—

Remote On/Off (Pin 1)

Referenced to –Vin (pin 2)

Input High Voltage

VIH

2.5

—

7.0 (2)

Input Low Voltage

VIL

–0.2

—

+0.8

Input Low Current

IIL

—

–10

–

µA

Standby Input Current

Iin standby

pins 1 & 2 connected

—

Internal Input Capacitance

Cin

—

0.5

—

µF

External Output Capacitance

Cout

Between +Vo and –Vo

—

200

µF

Isolation Voltage

Input to output

1500

—

Capacitance

—

1100

—

Resistance

——M

Ω

Operating Temperature Range

Over Vin range

-40

—

+85 (3)

°C

Storage Temperature

—

-40

—

+125

°C

Reliability

MTBF

Per Bellcore TR-332

4.0

—

106 Hrs

50% stress, Ta =40°C, ground benign

Mechanical Shock

—

Per Mil-Std-883D, method 2002.3,

—

500

—

G’s

1mS, half-sine, mounted to a fixture

Mechanical Vibration

—

Per Mil-Std-883D, method 2007.2,

—

G’s

20-2000Hz, soldered in a PC board

Weight

—

grams

Flammability

—

Materials meet UL 94V-0

Notes:

(1) The DC/DC converter will operate at no load with reduced specifications.

(2) The Remote On/Off (pin 1) has an internal pull-up, and if it is left open circuit the PT4120 will operate when input power is applied. Refer to the

application notes for interface considerations.

(3) See Safe Operating Area curves or contact the factory for the appropriate derating.

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