11
FN4725.5
November 18, 2004
Using the HIP1011DEVAL1 Platform
General and Biasing Information
The HIP1011DEVAL1 platform (Figure 24) comes as a three
part set consisting of 1 motherboard emulator and 2 load
cards. This evaluation platform allows a designer to evaluate
and modify the performance and functionality of the
HIP1011D or HIP1011E in a simple environment.
Test point numbers (TP#) correspond to the HIP1011D/E
device (U5) pin numbers. Thus TP3 and TP12 are
PWRON_2 and PWRON_1 respectively. These 2 pins are
the HIP1011D/E control inputs for each of the 2 integrated
but independent PCI power controllers in the HIP1011D/E.
On the HIP1011DEVAL1 platform are 4 HUF76132SK8,
(11.5m, 30V, 11.5A) N-Channel power MOSFETs, (Q1- Q4)
these are used as the external switches for the +5V and
+3.3V supplies to the load card connectors, P1 and P2.
Current sensing is facilitated by the four 5m 1W metal strip
resistors (R1-R4), the voltages developed across the sense
resistors are compared to references on board the
HIP1011D/E.
The HIP1011DEVAL1 platform is powered through the J1 to
J5 connector jacks near the top of the board (see Table 2 for
bias voltage assignments.)
After properly biasing the HIP1011D/E and ensuring there is an
adequate ground return from the HIP1011DEVAL1 platform to
the power supplies, (otherwise anomalous and unpredictable
results will occur) signal the PWRON inputs low then insert the
load cards as shown in Figure 15. Signaling either or both
PWRON pins high (>2.4V) will turn on the appropriate FET
switches and apply voltage to the load cards.
* The HIP1011DEVAL board is supplied with a HIP1011D
installed and in addition a loose packed HIP1011E.
Evaluating Time Delay to Latch-Off
Provided for delay to latch-off evaluation are 2 locations for
SMD capacitors, C7 and C8. Filling these locations places a
capacitor to ground from each of the HIP1011D/E FLTN pins
thus tailoring the FLTN signal going low ramp rate. This
provides a delay to the fault signal latch-off threshold
voltage, FLTN Vth. By increasing this time the HIP1011D
delays immediate latch-off of the bus supply switches, thus
ignoring transient OC and UV conditions. See Table 3
illustrating the time it takes for switch gate turn-off from the
FLTN start of response to an OC or UV condition. The FLTN
response to an OC or UV condition is 110ns. See Figures 20
through 23 for waveforms.
The intent of any protection device is to isolate the supply
quickly so a faulty card does not drag down a supply. A
longer latch-off delay results in less isolation from a faulty
card to supply.
TABLE 2. HIP1011DEVAL1 BIAS ASSIGNMENTS
J1 J2 J3 J4 J5
GND +5V -12V +12V +3.3V
LOAD CARDS
HIP1011D
FIGURE 15. CORRECT INSTALLATION OF LOAD CARDS
TABLE 3.
C7 AND C8 VALUE OPEN 0.001F0.01F0.1F
FLTN to Gate Response 0.1s0.44s2.9s28s
3V5VG
FLTN
FLTN, Vth
FIGURE 16. TIMING DIAGRAM
1ns
10ns
100ns
1µs
10µs
100µs
1ms
10ms
0.001µF 0.1µF 1µF 10µF
OPEN
0.01µF
FIGURE 17. TYPICAL OC/UV TO VG RESPONSE vs FLTN CAP
HIP1011D, HIP1011E
