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Application Note 1386
Selecting Switches
Switch S1 selects PVCC bias supply from V IN or an
additional supply source. When S1 is pushed up, the
PVCC bias connects to the input power side. When S1 is
pushed down, the PVCC bias connects to the additional
power supply. For typical applications, the PVCC bias
voltage is +5V (+10%) or +12V (+20%). It can also
supply a wider range from +6.5V to +14.4V.
S1
VIN
S1
VIN
FIGURE 2. QUICK START FOR EVALUATION BOARD
+5V/+12V
OR
+6.5V TO +14.4V
+5V/+12V
OR
+6.5V TO +14.4V
Figure 3 shows the ISL820xMEVAL1Z application
schematic for +5V or +12V input voltage. The PVCC pin
can connect to the input supply directly.
SWITCH
S1
UP
V IN
DOWN
+5V/+12V or +6.5V to +14.4V
C PVCC
Switch S2 selects module Enable (On) or Disable (Off).
When S2 is pushed up, the COMP/EN pin of the module is
enabled and the module starts initialization and
operation. When S2 is pushed down, the COMP/EN pin of
the module connects to ground and the module will be
COMP/EN
FB
PVCC
VIN
PHASE
VIN (+5V/+12V)
C IN
shut down.
EN
EN
R FB
ISET
PGND
VOUT
VOUT
R SEN-EX
C OUT
FIGURE 3. QUICK START SCHEMATIC
S2
S2
Typical Application Schematic
Typical Application with Separated Power
Supply
ENABLE
DISABLE
Figure 4 shows the ISL820xMEVAL1Z application
schematic for a wide input voltage from +1V to +20V.
SWITCH
S2
UP
EN
DOWN
Disable
The PVCC supply can source +5V/+12V or +6.5V to
+14.4V.
P VCC
(+5V/+12V OR +6.5V TO +14.4V)
Quick Start
The evaluation board can be evaluated simply, as shown
C PVCC
PVCC
in Figure 2. The power connection of the evaluation
board supplies the input voltage from the DC Power
Supply, and the load connection of the evaluation board
delivers power to the Electronic Load. If the input voltage
COMP/EN
FB
VIN
PHASE
C IN
VIN
(+1V TO +20V)
is +5V or +12V, the PVCC bias does not require
additional supply and it can connect to the input side
R FB
ISET
PGND
VOUT
VOUT
directly by pushing switch S1 to the up state.
R SEN-EX
C OUT
FIGURE 4. WIDE INPUT RANGE SCHEMATIC
3
AN1386.1
December 23, 2009
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