Kontron AT8901 - Manual (Page 46)

AT8901 Hardware Description
Page 3 - 15 AT8901 User Guide
3.7.2 Power Distribution
The 48 Volts are supplied by the backplane via two independent rails, primary (A) and second-
ary (B). The rails are mixed using power Schottky rectifiers. A 7A fuse protects each -48V line
and a 10A fuse protects each RTN line. A hot swap controller enables the 48V power to the
board.
A quarter brick DC/DC converter transforms the 48 Volts to secondary 12 Volts, which are dis-
tributed on the board. The converter allows a maximum of 14A output current.
Two different management voltages (3.3V and 5V) and five payload voltages (3.3V, 2.5V, 1.8V,
1.25V and 1.2V) are generated by point of load converters. These are either switches or linear
regulators.
Table 3-14: Power Connector (P10)
Signal Pin Pin Signal
N.C. 1 2 N.C.
N.C. 3 4 N.C.
HA0 5 6 HA1
HA2 7 8 HA3
HA4 9 10 HA4
HA6 11 12 HA5
SCL_A 13 14 SDA_A
SCL_B 15 16 SDA_B
MT1_TIP(N.C.) 17 18 MT2_TIP(N.C.)
RING_A(N.C.) 19 20 RING_B(N.C.)
MT1_RING(N.
C.) 21 22 MT2_RING(N.
C.)
RRTN_A(N.C.) 23 24 RRTN_B(N.C.)
SHELF_GND 25 26 LOGIC_GND
ENABLE_B 27 28 VRTN_A
VRTN_B 29 30 EARLY_A
EARLY_B 31 32 ENABLE_A
-48V_A 33 34 -48V_B
4
16
20
24
26
28
32
31
34
1
13
25
29
27
30
33
17
21