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Application Note 1200
What’s Inside
TABLE 1. SWITCH 1 SETTINGS
The Evaluation Board Kit contains the following materials:
? The ISL88550AEVAL1Z REVA board
SW1
1
SKIP
Connect to GND
OPERATING MODE
Normal operation mode, allow
automatic PWM/PFM switchover for
? The ISL88550A data sheet
pulse-skipping at light load.
? ISL88550AEVAL1Z Kit (this document)
2
Connect to AVDD
Low noise, fixed-frequency PWM
mode.
Recommended Equipment
3
No Connection
NA
The following materials are recommended to perform
testing:
? 0V to 22V power supply with at least 15A source current
capability, battery, notebook AC-adapter
NOTE: Only toggle one position at a time
TABLE 2. SWITCH 2 SETTINGS
? 5V Bias supply for VDD
? Two electronic loads capable of sinking current up to 15A
? Dummy loads for the LDO’s
? Digital multimeters (DMMs)
? 100MHz quad-trace oscilloscope
SW2
1
2
3
SHDNA#
Connect to GND
Connect to AVDD
No Connection
SHUTDOWN CONTROL
Shutdown mode. VDDQ, VTTR,
and VTT output.
Enable ISL88550. Rising edge
clear the fault protection. Connect
to AVDD for normal operation.
NA
? Signal generator
Quick Setup Guide
1. Ensure that the circuit is correctly connected to the supply
NOTE: Only toggle one position at a time
TABLE 3. SWITCH 3 SETTINGS
and loads prior to applying any power.
2. Connect the bias supply to VDD, the + terminal to P3
(VDD) and - return to TP5 (AGND).
3. Verify that position 2’s are ON for SW1, SW2, SW3, and
SW5. Verify that position 1 is ON for SW4. Make sure that
no other switch position is ON at the same time.
4. Turn on the VIN power supply.
SW3
1
2
3
-
t ON
Connect to GND.
Connect to AVDD.
Connect to REF.
OPEN
t ON ON-TIME SELECTION
t ON set to 600kHz frequency
t ON set to 200kHz frequency
t ON set to 450kHz frequency
t ON set to 300kHz frequency
5. Turn on 5V bias supply.
6. Verify the outputs voltages are 1.8V for VDDQ and 0.9V
for VTT.
NOTE: Only toggle one position at a time
TABLE 4. SWITCH 4 SETTINGS
The ISL88550EVAL1Z kit outputs are preset to 1.8V and
Evaluating the Other Output Voltage
Descriptor
0.9V; however, VDDQ output voltage can be adjusted from
0.8V to 3.5V by using Equation 1:
SW4
1
2
OVP/UVP
Connect to GND
Connect to AVDD
FAULT PROTECTION CONTROL
Disable OVP and UVP
Enable OVP and UVP
R 10 = ( R 8 ? [ ( VOUT/VFB ) – 1 ] )
(EQ. 1)
3
-
Connect to REF
OPEN
Disable OVP and enable UVP
Enable OVP and disable UVP
Set R8 to 25k Ω ; and VFB to 0.7V
VDDQ output can also be set to 2.5V by shorting FB pin to
GND with R 10 .
NOTE: Only toggle one position at a time
TABLE 5. SWITCH 5 SETTINGS
VTT output voltage is half on VDDQ in DDR application.
VTTI can be powered directly from VDDQ. For better
efficiency, VTTI can be powered from an external power
supply. Make sure that R 13 is removed.
SW5
1
2
3
STBY#
Connect to GND
Connect to V CC
No Connection
FAULT PROTECTION CONTROL
Shutdown VTT in high impedance
state. VTTR is still active.
Enable VTT
NOTE: Only toggle one position at a time
2
AN1200.3
July 23, 2008
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