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参数资料
| 型号： | HIP6521EVAL1 |
| 厂商： | Intersil |
| 文件页数： | 2/12页 |
| 文件大小： | 0K |
| 描述： | EVALUATION BOARD HIP6521 |
| 标准包装： | 1 |
| 主要目的： | DC/DC，LDO 步降 |
| 输出及类型： | 4，非隔离 |
| 输出电压： | 2.5V，1.5V，1.8V，2.5V |
| 电流 - 输出： | 8A，3A，3A，1A |
| 输入电压： | 3.3V，5V，12V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 300kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | HIP6521 |
Application Note 9908
? Hookup Guide for Piggy-Backing the Evaluation
Board Into Your System
Connect GND, +5VDUAL, +3.3VIN, and +3.3VDUAL turret
terminals to the corresponding voltages present on your
system board. For ACPI functionality, connect S3 IN (TP9)
and S5 IN (TP10) to your system’s S3 and S5 signal source.
Connect the evaluation board’s outputs to the corresponding
power planes in your system. Consult Table 1 for maximum
loads supported by the design of the in the configuration
received; consult the ‘Modifications’ section for information on
modifying the evaluation board to meet your special needs.
Operation
? Provide Power to the Board
Turn on the bench supplies or the system onto which the
board is piggy-backed.
If using an ATX supply, plug it into the mains. If the supply
has an AC switch, turn it on. The ‘5VSB’, ‘5VDUAL’, and ‘S0’
LEDs should light up, indicating the presence of 5V standby
and 5V dual voltages on board, as well as indicating active
state selection. Flip on the ‘ATX ON’ switch and shortly
thereafter ‘5VIN’ and ‘ATX PGOOD’ LEDs should light up
indicating the presence of main ATX 5V on board, as well as
Reference Design
General
The evaluation board is built on 1-ounce, 4-layer, printed circuit
board (see last three pages of this application note for layout
plots). Most of the components specific to the evaluation board
alone, which are not needed in a real computer application, are
placed on the bottom side of the board. Left on top of the
evaluation board are the components necessary to exemplify a
typical application, as well as the user interface (input/output
terminals, test points, switches, etc.).
Design Envelope
Although a real-life computer system application might have
different requirements, the HIP6521EVAL1 board was
designed to meet the maximum output loading described in
Table 1. Note the fact that the sleep state output currents are
likely limited only by the ATX power supply’s 5VSB output
capability. As all the outputs operate the same current paths
in both active and standby states, standby state power
dissipation capability equals that of active state. Dynamic
output tolerances and current ratings can be adjusted by
properly selecting the components external to the HIP6521.
TABLE 1. HIP6521EVAL1 MAXIMUM OUTPUT LOADING
the ATX PGOOD indication.
ACTIVE STATE
SLEEP STATES
TOL.
? Examine Start-Up Waveforms / Output Quality Under
Varying Loads
Start-up is immediate following application of bias voltage.
Using an oscilloscope or other laboratory equipment, you
may study the ramp-up and/or regulation of the controlled
voltages.
OUTPUT
VOLTAGE
2.5VMEM
2.5VCLK
I OUT
8.0A(pk)
3.0A(avg)
1.0A(pk)
0.4A(avg)
dI OUT /dt
1A/ μ s
0.1A/ μ s
I OUT
0.2A
(Note)
OFF
(STATIC/
dI OUT /dt DYNAMIC)
0.1A/ μ s 3%/5%
(Note)
OFF 5%/5%
In either state (active or S3, S5) vary the output loads to
simulate computer loads typical of the speci?c operating
state the circuit is in. Observe the limitations of the circuit
while in S3 or S5 states: all output power, along with any
1.8VMCH
1.5VAGP
3.0A(pk)
1.0A(avg)
3.0A(pk)
0.8A(avg)
1A/ μ s
1A/ μ s
0.1A
OFF
0.1A/ μ s
OFF
5%/5%
5%/5%
necessary operating bias current, is delivered from the ATX
supply’s 5VSB output.
? Examine State Transitions
For subsequent transitions into/out of standby states, leave
the main ATX outputs enabled (SW1 on); the on-board
circuitry will automatically turn them off when entering a
standby state and re-enable them when transitioning back
into active state. To enter a standby state, ?ip SW2 to the
position indicating the desired standby state. The ‘S3’ LED
lights up to indicate S3 standby state, while S5 state is
indicated by illumination of the ‘S5’ LED. Active state
indication is performed by the ‘S0’ LED.
Fault Handling
In case of a fault condition (output under-voltage on the
linear outputs, or overcurrent on the switching output), the
faulting output shuts down and undergoes an individual re-
start attempt every 3 soft-start (SS) intervals. Review the
appropriate data sheet section for more detail.
2
NOTE: In real applications, this output is OFF in S4/S5; requires
1.8VMCH to derive power from the 3.3VDUAL supply (not provided on
the HIP6521EVAL1).
From a thermal performance perspective, do not operate the
evaluation board for extended periods of time at output current
levels exceeding the design envelope, as detailed in Table 1.
Performance
Figures 2 through 8 depict the evaluation board’s
performance during typical operational situations. To
simulate minimum loading conditions, unless otherwise
speci?ed, the outputs were loaded with 65 ? resistive loads.
Soft-Start Start-Up
Figure 2 shows a typical HIP6521EVAL1 start-up. For this
capture, the ATX supply powering the board is turned on, at
time T0, with SW1 on and SW2 is in the S0 (middle)
position. At time T1 the input supply exceeds the power-on-
reset (POR) threshold and the 2.5VMEM and 1.8VMCH
outputs start ramping up toward their target value, which
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