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PT4520 Series

20-W 48-V Input Isolated

DC/DC Converter

PT4520 SERIES

Characteristic

Symbol

Conditions

Min

Typ

Max

Units

Output Current

—

1.3

—

1.6

A

—4

—5

Input Voltage Range

36

48

75

VDC

Set-Point Voltage Tolerance

—

±1

Temperature Variation

–40°

—

±0.5

—

Line Regulation

—

±0.2

±1

Load Regulation

—

±0.4

±1

(2)

Total Output Voltage Variation

Includes set-point, line, load,

—±2

±3

(2)

–40°

Efficiency

η

—

86

—

—

83

—

—

82

—

—

78

—

%

—

67

—

—

65

—

—

59

—

20MHz bandwidth

—

0.5

—

—

15

—

Transient Response

—

100

—

µs

—

±3

—

—

±150

—

mV

Current Limit Threshold

—

200

—

Output Voltage Adjust

—

±10

—

%

Switching Frequency

600

650

700

kHz

800

850

900

Under-Voltage Lockout

UVLO

—

31

—

V

Remote On/Off (Pin 1)

High-Level Input Voltage

2.5

—

V

Low-Level Input Voltage

–0.2

—

0.8

Low-Level Input Current

—

–10

–

µA

Standby Input Current

pins 1 & 2 connected

—

7

10

mA

Internal Input Capacitance

—

0.5

—

µF

External Output Capacitance

0

—

µF

Isolation Voltage

Input–output/input–case

1500

—

—

V

Capacitance

Input to output

—

1100

—

pF

Resistance

Input to output

10

—

—

M

Ω

Operating Temperature Range

–40

—

°C

Solder Reflow Temperature

Surface temperature of module pins or case

—

—

°C

Storage Temperature

—

–40

—

125

°C

Reliability

MTBF

Per Bellcore TR-332

4

—

—

Mechanical Shock

—

Per Mil-Std-883D, method 2002.3,

—

500

—

G’s

1mS, half-sine, mounted to a fixture

Mechanical Vibration

—

Mil-Std-883D, method 2007.2,

Suffix N

—

—

G’s

20-2000Hz , soldered

Suffixes A & C

—

—

Weight

—

—

—

23

—

grams

Flammability

—

Materials meet UL 94V-0

Notes:

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

(3)The Remote On/Off (pin 1)has an internal pull-up, and if it is left open circuit the PT4520 will operate when input power is applied. Refer to the

application notes for interface considerations.

(4)External output capacitance is not required for proper operation. Capacitamce may be added to improve the response to load transients. The maximum

total capacitance (including the load circuit) must not exceed 220µF, and the combined ESR of must not be less than 100m

Ω.

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

(6)During solder reflow of SMD package version do not elevate the module case, pins, or internal component temperatures above a peak of 215°C. For

further guidance refer to the application note, “Reflow Soldering Requirements for Plug-in Power Surface Mount Products,” (SLTA051).

(7)The case pins on the through-hole package types (suffixes N & A)must be soldered. For more information see the applicable package outline drawing.

SLTS148B - JUNE 2000 - REVISED OCTOBER 2002