PKR2000A Datasheet, PDF (20/27 Pages) Ericsson – DC/DC converters, Input 18-36 V, Output up to 2 A/15 W

E
Ericsson Internal
PRODUCT SPECIFICATION
Prepared (also subject responsible if other)
No.
ESKEVIN
3/1301-BMR 640_T1_e2_c1_h1+_niU_ce_an_{l Specification}
Approved
S^PE^KC^R/D²(⁰J⁰ul⁰ia^AYo^su^e)^ries
Checked
EZYPING
Date
2007-8-20
Rev
Reference
E_BN/LZT 146 352 R2C September 2007
DC/DC converters, Input 18-36 V, Output up to 2 A/15 W ^{© Ericsson Power Modules AB}
Thermal Consideration continued
Connections
4 (5)
20
Definition of reference temperature (T_ref)
The reference temperature is used to monitor the temperature
limits of the product. Temperatures above maximum T_ref are
not allowed and may cause degradation or permanent
damage to the product. T_ref is also used to define the
temperature range for normal operating conditions.
T_ref is defined by the design and used to guarantee safety
margins, proper operation and high reliability of the module.
Ambient Temperature Calculation
By using the thermal resistance the maximum allowed
ambient temperature can be calculated.
18 17 16 15 14 13 12 11 10
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1. The power loss is calculated by using the formula
((1/η) - 1) × output power = power losses (Pd).
η = efficiency of converter. E.g. 82 % = 0.82
2. Find the thermal resistance (Rth) in the Thermal Resistance
graph found in the Output section for each model.
Calculate the temperature increase (ΔT).
ΔT = Rth x Pd
3. Max allowed ambient temperature is:
Max Tref - ΔT.
E.g. PKR 2610A SI at 1m/s:
1. (( ¹ ) - 1) × 6.6 W = 1.45 W
0.82
2. 1.45 W × 10°C/W =14.5°C
3. 110 °C — 14.5°C = max ambient temperature is 95.5°C
The actual temperature will be dependent on several factors
such as the PCB size, number of layers and direction of
airflow.
Pin
1
Designation
Out 1
Function
Output 1
2
Rtn
Output return
3
Out 2²⁾
Output 2
4
NC
Not connected
5
NC
Not connected
6
NC
Not connected
7
Sync
Synchronization input
8
Vadj
Output voltage adjust
9
NOR
10
TOA
Connection of Nominal Output
voltage Resistor¹⁾
Turn-on/off input voltage adjust
11
RC
12
NC
Remote control. Used to turn-
on/off output
Not connected
13
NC
Not connected
14
NC
Not connected
15
NC
Not connected
16
NC
Not connected
17
+ In
Positive Input
18
-In
Negative input
1) _{Nominal voltage when pin 8 & 9 are connected together.}
2) _{Only for duals.}