9

Exploring and Using the HIP1012EVAL1

Board

(Figure 13)

The HIP1012EVAL1 is a flexible platform for a thorough

evaluation of the HIP1012 dual power supply controller. This

eval board comes in three separate parts allowing the

evaluation of two principal configurations. To simulate a

passive back plane implementation both the GENERIC and

LOAD sections are first connected together and then the

GENERIC board is connected onto the BUS board. For an

active backplane or for the HIP1012 on an interposer board

configuration, the BUS and GENERIC sections are first

connected together and then the load board is connected

onto the GENERIC board.

The HIP1012EVAL1 board has many built in features

besides the configuration flexibility described above.

The BUS board is designed so that adding suitable

connectors and/or power supply capacitive filtering is very

easy to do through the numerous through holes for each rail

voltage and ground. Passive backplane power sequencing

can be simulated by simply shortening the finger lengths for

the rail(s) that need to come up after initial ground

connection is made.

The GENERIC board, is a flexible evaluation platform with

many designed in features for user customizing and

evaluation. The circuit is shipped default configured in the

3.3V and 5V controller mode by jumpers for easy

reconfiguration (see Table 3 for jumper settings). The default

configuration is highlighted in Table 3. The default OC levels

are 5A on the 3.3V and 1A on the 5V supplies. To operate

the HIP1012 GENERIC board in its default configuration (3V

and 5V) a dedicated +12V power supply must be provided

for the HIP1012 through tie point, W1 on the generic board.

To operate the board in the +12V and 5V mode, JP2 and

JP3 need to be reconfigured (see Table 3) and a suitable

current load needs to be provided. A programmable

electronic current load is an excellent evaluation tool for this

device. The load board is configured to sink about 3

±1A at

3.3V. For 12V operation, the load must be modified to sink

less than 5A, otherwise, an OC failure upon power will occur.

The GENERIC board is provided with a single pair of

RF1K49156 N-Channel MOSFETs, if currents > 6A are to be

evaluated then an additional pair of RF1K49156 MOSFETs

can be installed in the provided space. Additionally for even

higher current evaluations space for TO-252AA, DPAK or

Semiconductor for availability of Power MOSFET samples.

Tie points on the output side of the GENERIC board are

provided for direct access to a high current load.

Performance customizing can easily be accomplished by

substitution/addition of several SMD components to the

existing layout or by utilizing the included bread board area.

See Table 5 for the component listing and applicable

formulae.

The LOAD board, consists of four load switches, output

resistive and capacitive loads and output on indicating

LED’s. The resistive loads are configured so that either no

current, a low or high current load relative to the OC trip

point can be invoked for both supplies. An OC event can be

emulated by switching both switches of any one output to the

on position (see Table 4, OC conditions highlighted). Load

connection sequencing can be done by shorting the desired

finger lengths. As noted, the GENERIC board is default

configured for 3V and 5V operation. For 12V evaluation

replace RL3 and RL4 with a suitable load.

TABLE 3. JUMPER CONFIGURATION

JP #

OPEN /

SHORT

CIRCUIT CONDITION

1

Short to

GND

2-3

PWRON2 shorted to ground. True HOT

SWAP mode. PWRON1 only controls reset

with rising edge.

1

Short to 5V

1-2

PWRON2 shorted to 5V. Reset and turn on

controlled only by PWRON1. Single input

control mode

1

Open

PWRON2 will be internally pulled high to

~2.5V, compatible with logic signal. The

HIP1012 can not turn on until PWRON2 is

driven low.

2

Open

HIP1012 must be powered from a

dedicated +12V power supply.

2

Short

supply as load. See Decoupling Concerns in

Critical Items section.

3

Open

C1 in circuit. Charge pump capacitor

necessary for 5V and 12V operating mode to

develop ~ 11.7V for 12VG voltage.

3

Short

Shorts across charge pump capacitor,

C1. Capacitor not needed in 3V and 5V

mode.

4

Short to

GND

1-2

HIP1012 MODE/PWRON1 shorted to

ground. True HOT SWAP mode. PWRON2

rising edge only resets HIP1012.

4

Short to 5V

2-4

MODE/PWRON1 shorted to 5V. PWRON2

only single mode control.

4

Short to

2-3

HIP1012 MODE/PWRON1 connected to

invokes and configures HIP1012 for 3V

and 5V operation. Controlled by PWRON2

4

Open

HIP1012 MODE/PWRON1 will be internally

pulled high to ~2.5V, compatible with logic.

Redundant controller mode when each

PWRON pin is driven by separate signals.

TABLE 4. LOAD CURRENT

SW13

SW14

3.3V

SW11

SW12

5.0V

000000

01201

0.5

10410

0.74

1

1

6

1

1

1.24

HIP1012, HIP1012A