ISL6224EVAL1 Intersil, ISL6224EVAL1 Datasheet - Page 2

• Manufacturer Part Number: ISL6224EVAL1
• Description: EVALUATION BOARD FOR ISL6224
• Manufacturer: Intersil

Specifications of ISL6224EVAL1

• Main Purpose: DC/DC, Step Down
• Outputs And Type: 1, Non-Isolated
• Voltage - Output: 2.5V
• Current - Output: 3A
• Voltage - Input: 4 ~ 24V
• Regulator Topology: Buck
• Frequency - Switching: 300kHz
• Board Type: Fully Populated
• Utilized Ic / Part: ISL6224
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Power - Output: -

Connect the Input Power Supplies
• Connect a 1AMP, 0 to +5VDC Power Supply as follows:
• Connect a 5AMP, 0 to +24VDC Power Supply as follows:
Connect the Output Load
• Connect a 5AMP Electronic Load as follows:
Operation
Examine Start-up Waveforms
NOTE: VIN MUST BE TURNED ON BEFORE VCC IN ALL CASES
Turn on the VIN power supply and the VCC power supply.
Move the EN bit of S1 to the UP position. The start up
sequence may be observed by using an oscilloscope. In
Figure 2 the voltage on the SOFT pin of the IC, the output
voltage at TP5, the power good signal at TP3, and the
voltage of the enable signal at post J12 show typical
waveforms. The voltage on the SOFT pin of the IC is
produced by a 5µA current source charging a user supplied
capacitor. The ramp time of the soft start voltage is
controlled by the value of the charging capacitor. The output
voltage follows the soft-start voltage. The green LED will
illuminate when the output is within 10% of the nominal
value. If the EN bit of switch S1 is moved to the DOWN
position the LED will be red, indicating the converter is off.
When a fault condition occurs the LED will be RED even
though the EN bit of S1 is in the UP position. The fault latch
may be cleared by turning the VCC power supply off, then
on again.
VIN 5-24V 300kHz
VIN 5V 300kHz
VIN 5V 600kHz
- Before connecting to the evaluation board, turn on the
- Power Supply positive terminal to the VCC post (J7).
- Power Supply negative terminal to the GND post (J6).
- Before connecting to the evaluation board, turn on the
- Power Supply positive terminal to the VIN post (J2).
- Power Supply negative terminal to the GND post (J8).
- Electronic Load positive terminal to the VOUT post (J4).
- Electronic Load negative terminal to the GND post (J3).
OPERATION
power supply and adjust the output to +5V then turn off.
power supply and adjust the output to +5V then turn off.
MODE
INPUT VOLTAGE (V)
4 to 24
5
5
2
TABLE 2. EVALUATION BOARD INPUT/OUTPUT REQUIREMENTS
OUTPUT VOLTAGE
0.9 to 5.5
0.9 to 3.3
0.9 to 3.3
Application Note 9983
(V)
CURRENT (A)
MIN OUTPUT
Output Ripple
The ISL6224EVAL1 evaluation board is populated with one
330µF/6.3V SANYO POSCAP output capacitor which has
40mΩ ESR at 100kHz. Figures 3 to 8 show the output
voltage ripple and phase node voltage when the converter is
operating in various modes and various combinations of VIN
and Fs. Please see the ISL6224 data sheet for detailed
instructions on how to select the output capacitor.
Transient Response
The transient response of the converter is the time interval
∆T required to slew the inductor current from an initial value
to a final value such that the output voltage stays
constrained within a specified range. The inductor ripple
current affects the transient response performance. Figures
9 to 14 show the transient performance of the evaluation
board.
NOTE: In following figures; CH1: Vout = 2.5 V, AC coupled.
0
0
0
FIGURE 2. SOFT-START ON 3.3V OUTPUT (2ms/Div)
TYPICAL OUTPUT
CURRENT (A)
2
1
1
Vout (2V/div)
ENABLE Pin (5V/div)
PGOOD Pin (5V/div)
SOFT Pin (1V/div)
MAX OUTPUT
CURRENT (A)
3
2
2