ISL6160EVAL2 Intersil, ISL6160EVAL2 Datasheet

ISL6160EVAL2

Manufacturer Part Number

ISL6160EVAL2

Description

EVAL BOARD FOR ISL6160/HIP6006

Manufacturer

Intersil

Datasheets

1.ISL6160CBZA.pdf (11 pages)

2.HIP6006CBZ.pdf (12 pages)

3.ISL6160EVAL2.pdf (7 pages)

Specifications of ISL6160EVAL2

Main Purpose

DC/DC, Step Down

Outputs And Type

1, Non-Isolated

Voltage - Output

Current - Output

3.5A

Voltage - Input

5V, 12V

Regulator Topology

Buck

Board Type

Fully Populated

Utilized Ic / Part

HIP6006, ISL6160

Lead Free Status / RoHS Status

Contains lead / RoHS non-compliant

Power - Output

Frequency - Switching

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Introduction

The InfiniBand architecture represents a significant evolution

of high-performance, switched-fabric interconnect systems.

The goal is to provide a high-performance, reliable, and

scalable way to connect high-end servers to each other and

to I/O subsystems, routers and switches that connect to the

world outside the data center.

Available from Intersil is the ISL6160, an evolution of IC power

sequencing, control and protection for InfiniBand I/O modules

(IM). The ISL6160 is designed to address the unique power

requirements of the InfiniBand (IB) industry initiative

providing independent power control of both the VB (bulk)

(+12V) and the VA (auxiliary) (+5V) power rails for a single

port. This device can be implemented in both IB Class I (non

isolated) and Class II (isolated) Power Topology

applications.

Intersil also provides the ISL6160EVAL2 concept evaluation

platform. The ISL6160EVAL2 is a complete InfiniBand Class I

(non isolated) power topology evaluation platform which

highlights the operation of the ISL6160 and the HIP6006 single

output PWM controller. See Figure 1 for a simplified block

diagram of the ISL6160EVAL2 platform. This evaluation

platform allows the InfiniBand Module (IM) power supply

designer to evaluate the concept of this design and apply this

concept to a specific IM power requirement. The evaluation

platform is configured for 5V Vout and 3.5A max Iout capability

where it exhibits an efficiency of 85%, all in a small 1.6 sq” area.

See Figure 11 for a complete ISL6160EVAL2 schematic.

Using the ISL6160EVAL2 Concept Board

The ISL6160EVAL2 consists of a bus and load boards,

representing the IB chassis and IM respectively. The bus board

has terminals for VA and VB supplies. The load board with its

staggered length connector fingers to emulate the IM connector

then hot plugs into the socket as shown in Figure 2.

When the load board is inserted into the bus board, the stagger

on the connector fingers, first provides VX_RET, then VX

connections, and finally the shortest finger emulates the

VBx_En_L line connection.

Once VB_In is connected the VB control portion of the circuit is

biased but the VB Secondary Rail (TP1) is held off until the

ISL6160 VB_ON pin is signaled high. Local power enable

signaling is provided through the LCL_PWR_EN jumper either

as a hard tie ‘high’ with the jumper installed or through an

external input signal, on TP6 with the jumper removed. A single

logic gate IC, provides for the XORing of the VBxEN _L and

local power enable signals into the ISL6160 VB_ON pin. At the

time VB_ON is asserted high the ISL6160 turns on the VB

Secondary Rail in a soft start mode protecting the primary

Application Note

InfiniBand Class I Power Supply Using the

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

1-888-INTERSIL or 321-724-7143

supply rail from sudden in-rush current. During turn-on, the

external gate capacitor of the N-Channel MOSFET, Q3 (VB

switch) is charged with a 20µA current source resulting in a

programmable ramp (soft start turn-on). An internal charge

pump supplies the gate drive for the 12V VB supply switch

driving the MOSFET gate to VB +5V. Once the VB Secondary

Rail ramps to 10V the DC-DC_En pin is pulled high thus

enabling the accompanying voltage converter. The DC-DC

converter then provides a well regulated output voltage to the

load. For lab evaluation either an electronic or a passive load is

suitable for suppling a load current.

The ISL6160 VA undervoltage lockout feature prevents turn-on

of VA until VA_In > 2.5V. It then enables the VA soft start and

power up. The VA rising voltage output is a current limited ramp

so that both the inrush current and voltage slew rate are limited,

independent of load. This reduces supply droop due to surge

and eliminates the need for additional external EMI filters.

During operation, once a VA OC condition is detected the

output current is limited to 1A for 12ms to allow transient

conditions to pass. If VA is still in current limit after the current

limit period has elapsed, the output is then latched off. The VA

to the IM circuitry is latched off until reset by the disconnection

and reconnection of the IM from the chassis backplane.

The VB Secondary Rail is enabled once the VB_ON (TP7) is

signalled high (through the assertion of the local power enable),

then the DC-DC En pin (TP2) is pulled high to VB. The RC

network of R4, R15 and C14 allows for setting the DC-DC

converter enabling signal level and ramp, thus customizing the

time to DC-DC enabling. Once the DC-DC is enabled the

output (TP3) ramps to 5V. The output is supplied with a banana

jack for connecting to an external active or passive load.

Figure 3 illustrates typical operational waveforms of the

ISL6160EVAL2. These are accessible through the labeled test

points (TPX) on the eval board.

See Figures 4 and 5 for ISL6160EVAL2 turn-on and turn-off

output voltage waveforms.

VB_IN

VB_ON

VA_IN

September 2001

FIGURE 1. ISL6160EVAL2 BLOCK DIAGRAM

ISL6160 and HIP6006 ICs

ISL6160

DC-DC_ON

Intersil and Design is a trademark of Intersil Americas Inc.

VAout

LOAD

HIP6006

UGATE

LGATE

AN9959

Vout

Related parts for ISL6160EVAL2

ISL6160EVAL2 Summary of contents

Page 1

... Figure 3 illustrates typical operational waveforms of the ISL6160EVAL2. These are accessible through the labeled test points (TPX) on the eval board. See Figures 4 and 5 for ISL6160EVAL2 turn-on and turn-off output voltage waveforms. CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. ...

Page 2

... DIV ISL6160EVAL2 Performance Efficiency Figure 6 displays the ISL6160EVAL2 efficiency versus load current. It highlights the efficiency advantages of a switching regulator at a higher load current. The designed current limit of this evaluation bd is ~3.5A. The dashed portion of the curve was collected from a modified evaluation board with an increased overcurrent protection limit ...

Page 3

... HIP6006 will limit current to the load. ISL6160 OC Protection The ISL6160EVAL2 is designed to input current limit to 2.8A, the max. specified peak current for a 25W port. This allows a maximum output current of ~3. output voltage. As Iout increases above 3.5A the input current ripple peaks increase and are limited to 2 ...

Page 4

... FIGURE 9. ISL6160EVAL2 OVER-CURRENT OPERATION Power Supply Design Considerations The concept of the power supply demonstrated by the ISL6160EVAL2 can be scaled across the entire range of 1.3V to 12V of output voltage 50W port power level. To encompass this entire range there are several component variables and trade-offs to consider. These variables and ...

Page 5

... HIGH Conclusion The ISL6160EVAL2 board lends itself well to the evaluation of a complete single fixed voltage IB Class I power supply and providing a conceptual platform for your specific IM power control and supply needs. In addition, with the availability of multiple output voltage ...

Page 6

... HIP6006 REF PVCC 13 - LGATE PGND - 33pF C10 COMP GND R7 C11 20K C9 R9 1.6K FIGURE 11. ISL6160EVAL2 SCHEMATIC TP8 C13 0.1µF VA_RET TP1 C5 1µF 1206 C6 D2 1000pF 4148 R6 4.1K TP9 Q2a C15 0.1µF L1 Q2b C12 820µF VB_RET TP3 5VOUT ...

Page 7

... Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use ...

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