For technical support and more information, see inside back cover or visit www.ti.com

PT4850 Series

25-A Triple Output Isolated DC/DC

Converter For Logic Applications

Electrical Specifications

PT4850 Series (Except PT4856)

Characteristics

Symbols

Conditions

Min

Typ

Max

Units

Output Current

Each output

0—

15

0—

10

A

0—

10

Total (all three outputs)

—

—

25

A

Input Voltage Range

Continuous

36

—

75

V

Surge (1 minute)

—

—

80

Set-Point Voltage Tolerance

—

—

1.5

Temperature Variation

–40°C

—

±0.5

—

Line Regulation

—

±0.2

±0.5

Load Regulation

Each output, 0

—

±5

±10

mV

Cross Regulation

Any output vs. another

—

—

±10

mV

Total Output Voltage Variation

Includes set-point, line, load,

—±2

±3

(1)

–40°C

Efficiency

η

—

85

—

%

20MHz bandwidth,

—

50

75

—

20

50

—

20

30

—

15

25

Transient Response

—

200

—

µSec

—

5

—

Output Adjust Range

—

±10

—

Current Limit Threshold

—20

—

—15

—

A

—15

—

Output Over-Voltage Protection

OVP

All outputs; module shutdown and latch off

—

Switching Frequency

280

320

340

kHz

Under Voltage Lockout

—

34

36

V

30

32

—

Enable Control (pins 3 & 4)

High-Level Input Voltage

3.5

—

V

Low-Level Input Voltage

–0.2

—

Low-Level Input Current

—

0.5

—

mA

Standby Input Current

pins 3 & 4 open circuit

—

2.5

mA

Internal Input Capacitance

—2

—µF

External Output Capacitance

Per each output

0

—

5,000

µF

Primary/Secondary Isolation

1500

—

—

V

—

2,200

—

pF

10

——M

Ω

Temperature Sense

Output voltage at temperatures:-–40°C

—

—

V

100°C

—

—

Notes: (1) Limits are specified by design.

application note on output voltage adjustment.

operate when input power is applied. The maximum open-circuit voltage for the Enable inputs is 5.4V.

SLTS166C - FEBRUARY 2002 - REVISED MARCH 2003