Datasheet

Defi nition of reference temperature TP1
The reference temperature is used to monitor the temperature limits
of the product. Temperature above maximum TP1, measured at the
reference point P1 is not allowed and may cause degradation or
permanent damage to the product. TP1 is also used to defi ne the
temperature range for normal operating conditions. TP1 is defi ned by
the design and used to guarantee safety margins, proper operation
and high reliability of the product.
Pin Designation Function
1A, 1B VIN Input Voltage
2A, 2B GND Power Ground
3A, 3B VOUT Output Voltage
4A VTRK Voltage Tracking input
4B PREF Pin-strap reference
5A +S Positive sense
5B −S Negative sense
6A SA0 PMBus address pinstrap 0
6B GCB Group Communication Bus
7A SCL PMBus Clock
7B SDA PMBus Data
8A VSET Output voltage pinstrap
8B SYNC Synchronization I/O
9A SALERT PMBus Alert
9B CTRL Remote Control
10A PG Power Good
10B SA1 PMBus address pinstrap 1
Thermal Consideration
General
The product is designed to operate in different thermal environments
and suffi cient cooling must be provided to ensure reliable operation.
Cooling is achieved mainly by conduction, from the pins to the host
board, and convection, which is dependent on the airfl ow across the
product. Increased airfl ow enhances the cooling of the product.
The Output Current Derating graph found in the Output section
for each model provides the available output current vs. ambient air
temperature and air velocity at specifi ed VI.
The product is tested on a 254 x 254 mm, 35 µm (1 oz), test board
mounted vertically in a wind tunnel with a cross-section of 608 x 203
mm. The test board has 8 layers.
Proper cooling of the product can be verifi ed by measuring the tem-
perature at positions P1 and P2. The temperature at these positions
should not exceed the max values provided in the table below.
Note that the max value is the absolute maximum rating (non
destruction) and that the electrical Output data is guaranteed up to
TP1 +95°C.
Defi nition of product operating temperature
The product operating temperatures are used to monitor the tempera-
ture of the product, and proper thermal conditions can be verifi ed by
measuring the temperature at positions P1 and P2. The temperature
at these positions (TP1, TP2) should not exceed the maximum tem-
peratures in the table below. The number of measurement points may
vary with different thermal design and topology. Temperatures above
maximum TP1, measured at the reference point P1 are not allowed
and may cause permanent damage. It should also be noted that
depending on setting of the over temperature protection (OTP) and
operating conditions, the product may shut down before the maximum
allowed temperature at TP1 is reached.
Position Description Max Temp.
P1 Reference point, L1, inductor 125°C
*
P2 N1, control circuit 125°C
*
* A guard band of 5 °C is applied to the maximum recorded component temperatures
when calculating output current derating curves.
Pin layout, top view (component placement for illustration only).
P1
P2
AIR FLOW
SIP Version:Temperature positions and air fl ow direction.
Top view
Bottom view
P1
AIR FLOW
P2
Temperature positions and air fl ow direction.
OKDx-T/50-W12-C
50A Digital PoL DC-DC Converter Series
MDC_OKDx-T/50-W12-C.A04 Page 29 of 41
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