SLTS153B datasheet(2/9 Pages) TI1

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PT4500 Series

20-W 24-V Input Isolated

DC/DC Converter

Specifications (Unless otherwise stated, Ta =25°C, Vin =24V, Cout =0µF, and Io =Iomax)

PT4500 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

Vo ≤ 3.3V

0.1 (1)

—5

Input Voltage Range

Vin

Over Io Range

VDC

Set Point Voltage Tolerance

Vo tol

—

±1

±1.5 (2)

%Vo

Temperature Variation

Regtemp

–40°

≤Ta≤ +85°C, Io =Iomin

—

±0.5

—

%Vo

Line Regulation

Regline

Over Vin range

—

±0.2

±1

%Vo

Load Regulation

Regload

Over Io range

≥5.0V

—

±0.4

±1

(2)

%Vo

Vo ≤3.3V

—

±13

±33

Total Output Voltage Variation

∆Votot

Includes set-point, line, load,

—±2

±3

(2)

%Vo

–40°

≤Ta ≤ +85°C

Efficiency

Vo = 15V

—

Vo = 12V

—

Vo =5.0V

—

Vo =3.3V

—

Vo =1.8V

—

Vo =1.5V

—

Vo =1.2V

—

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

—

%Vo

Vo ≤ 3.3V

—

±150

—

Current Limit Threshold

Ilim

Vin =18V, ∆Vo = –1%

—

200

—

%Iomax

Output Voltage Adjust

Vo adj

—

±10

—

Switching Frequencyƒs

Over Vin range

Vo≥ 5.0V

600

650

700

kHz

Vo ≤ 3.3V

800

850

900

Under-Voltage Lockout

UVLO

—

16.5

—

Remote On/Off (Pin 1)

Referenced to –Vin (pin 2)

High-Level Input Voltage

VIH

2.5

—

Open (3)

Low-Level Input Voltage

VIL

–0.2

—

0.8

Low-Level Input Current

IIL

—

–10

–

µA

Standby Input Current

Iin standbypins 1 & 2 connected

—

Internal Input Capacitance

Cin

—

0.5

—

µF

External Output Capacitance

Cout

—

220 (4)

µF

Isolation Voltage

Input–output/input–case

1500

—

Capacitance

Input to output

—

1100

—

Resistance

Input to output

—

Ω

Operating Temperature Range

Over Vin range

–40

—

85 (5)

°C

Solder Reflow Temperature

Treflow

Surface temperature of module pins or case

—

215 (6)

°C

Storage Temperature

—

–40

—

125

°C

ReliabilityMTBF

Per Bellcore TR-332

—

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

—

Mil-Std-883D, Method 2007.2

Suffix N

—

20 (7)

—

G’s

20-2000Hz, soldered

Suffix A, C

—

20 (7)

—

Weight

—

grams

Flammability—

Materials meet UL 94V-0

Notes:

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

(2) For optimum voltage accuracy the ‘Remote Sense (+)’ and ‘Remote Sense (–)’ pins must be connected to +Vout and –Vout respectively.

(3)The Remote On/Off control (pin 1)has an internal pull-up. If pin 1 is left open the PT4500 will operate when input power is applied. A small low-

leakage (<100nA) MOSFET must be used to control this input. The open-circuit voltage is less than 10V. See application notes for further information.

(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.

SLTS153B - JUNE 2000 - REVISED OCTOBER 2002

Not Recommended For New Designs

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