PTK25-D48-D12

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Document overview

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Technical content

Page 1

DESCRIPTION: dc-dc converter

PART NUMBER: PTK25

Page 2

DESCRIPTION: dc-dc converter

PART NUMBER: PTK25

INPUT

parameter conditions/description

min nom max units

input voltage range

18 24 36 VDC

36 48 72 VDC

remote on/off control output turn-on3

2.5V (open) 5.5V

output turn-off

0V (short) 0.8V

switching frequency constant

300

KHz

NOTE: 3 output defaults to “on” when there is no connection to the “CNT” pin.

OUTPUT

parameter

conditions/description

min nom max

units

output trim range

with external trim resistors

-5%

+5%

set point accuracy

single output

-2%

+2%

dual output

-3%

+3%

line regulation

single output models

-0.25%

+0.25%

(low line to high line)

dual output models

-2.5%

+2.5%

triple: main output (Vout)

-0.25%

+0.25%

auxillary outputs (+Vaux / -Vaux)

-5%

+5%

load regulation

single output models- no load to full load

-0.25%

+0.25%

dual output models- balanced loads

-2.5%

+2.5%

triple: main output (Vout)

-0.25%

+0.25%

auxillary outputs (+Vaux / -Vaux)- with 10%

-5%

+5%

load on Vout and balanced loads on+Vaux and -Vaux converters will not be damaged if loading conditions are less than minimum specified loads,

minimum load

but regulation specs may not be met4

ripple and noise

see chart

NOTE: 4 single output: no min. load required, dual: 10%, triple: balanced loads

PROTECTION

parameter

conditions/description

min nom max units

continuous auto recovery 5

over-current

105%

135%

internally zener clamped 5

over-voltage

110%

140%

NOTE: 5 continuous operation in a protected state may compromise long-term reliability.

GENERAL

parameter

conditions/description

min nom max units

efficiency

typical at full load

77%

83%

isolation voltage

input/case, input/output, output/case

500

VAC

insulation resistance

at 500 VDC

100M

Ohms

approved to UL60950(E222889), CSA C22.2 No. 60950, TUV EN60950 (single output only)

agency standards case material

Zn

material flammability

94 V-0

weight

80

grams

(2.82)

(ounces)

MTBF

MIL-HDBK-217F

470k

hours

operating temperature regular models - see derating curve.

-20

+71 °C

extended temperature models

-40

+85 °C

storage temperature

-40

+105 °C

humidity

operating (non-condensing)

5%

95% RH

washability

not intended for aqueous wash

Page 3

DESCRIPTION: dc-dc converter

PART NUMBER: PTK25

DIMENSIONS (mm)

PIN DEFINITIONS

DERATING CURVES

Page 4

DESCRIPTION: dc-dc converter

PART NUMBER: PTK25

APPLICATION NOTES

1. OUTPUT TRIMMING

The output voltages are preset to nominal values as indicated by the models table at the factory. If desired, the output voltage may optionally be trimmed to a different value (+/- 10%) with external resistors and/or potentiometer as shown below.

To trim the output voltage with fixed resistors, the output voltage can be calculated as follows.

+Vo

+Vin

Trim

R load

R trim-up

-Vin

-Vo

Trim-Up

FIGURE 2: TRIM-UP VOLTAGE SETUP

Vr · R1 · R2

Rtrim_up=

R2 · (Vo - Vr) - Vr · R1

The value of Rtrim-up is defined as: Where: Rtrim-up is the external resistor in KΩ. Vo is the desired output voltage. R1 and R2 and Vr are internal to the unit and are defined in Table 1. For example to trim up the PTK25-D5-D12 up by 5% to 25.2 V, Rtrim-up is calculated

as follows:

Vo = 25.2 / R1 = 21 KΩ / R2 = 2.43 KΩ / Vr = 2.5

2.5 · 21 · 2.43

Rtrim_up =

= 47.94 KΩ

2.43 · (25.2 - 2.5) - 2.5 · 21

+Vo

+Vin

R trim-down

Trim

R load

-Vin

-Vo

Trim-Down

FIGURE 3: TRIM-DOWN VOLTAGE SETUP

(Vo - Vr) · R1 · R2

Rtrim_down=

Vr · R1 - (Vo - Vr) · R2

The value of Rtrim-down is defined as: Where: Rtrim-down is the external resistor in KΩ. Vo is the desired output voltage. R1 and R2 and Vr are internal to the unit and are defined in Table 1. For example to trim down the PTK25-D5-D12 down by 5% to 22.8 V, Rtrim-down is calculated

as follows:

Vo = 22.8 / R1 = 21 KΩ / R2 = 2.43 KΩ / Vr = 2.5

(22.8 - 2.5) · 21 · 2.43

Rtrim_down=

= 326.68 KΩ

2.5 - 2.1 (22.8 - 2.5) · 2.43

Table 1