ISL62383LOEVAL1Z データシートの表示（PDF） - Intersil
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ISL62383LOEVAL1Z Datasheet PDF : 14 Pages
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Application Note 1398
Take Channel-1 as an example, once the value of ROCSET
is calculated, follow the following procedure to configure the
resistor current sense circuit:
Step 1:
Open the “DCR SENSE” solder bridge and
connect the “RESISTOR SENSE” solder bridge
on the PCB bottom layer;
Step 2:
Step 3:
Step 4:
Step 5:
Remove R7 (R22 for Channel-2);
Replace R3 (R25 for Channel-2) with RSENSE;
Replace C6 (C25 for Channel-2) with ROCSET;
Replace replace R19 (R18 for Channel-2) with
ROCSET.
Dynamic Load Generator
The evaluation board provides each PWM channel an
on-board dynamic load generator for evaluating the
transient-load response, which are controlled by SW1 and
SW2 respectively. The dynamic load generator applies a
300µs pulse load across VOUT and GND. The transient load
slew-rate can be trimmed by adjusting the resistors R29, R34
for the rising edge, and R23, R30 for the falling edge. A +12V
power supply is needed to power the dynamic load
generator.
Connections and Test Points The following table describes the function and operation of the evaluation board.
NUMBER
NAME
FUNCTION/OPERATION
INTERFACES AND CONNECTIONS
TP3
VBAT
VIN positive power input
TP4
GND
VIN return power input
TP1
VOUT1
Channel-1 positive power output
TP2
GND
Channel-1 return power output
TP11
VOUT2
Channel-2 positive power output
TP12
GND
Channel-2 return power output
TP7
+12V
+12V positive power input, used for the power supply of the on-board dynamic-load generator
TP9
GND
+12V return power input
TEST POINTS
J1
PHASE2
Scope-probe socket for measuring Channel-2 phase node
J3
PHASE1
Scope-probe socket for measuring Channel-1 phase node
J2
VOUT1
Scope-probe socket for measuring Channel-1 output
J5
VOUT2
Scope-probe socket for measuring Channel-2 output
J4
FLOAT_FCCM Remove the jumper will float the FCCM pin
J6
FLOAT_EN1 Remove the jumper will float the EN1 pin
J7
FLOAT_EN2 Remove the jumper will float the EN2 pin
TP6
EN1
Test point of EN1 pin
TP8
EN2
Test point of EN2 pin
J1
PHASE2
Scope-probe socket for measuring Channel-2 phase node
POWER-GOOD INDICATORS
TP13
PGOOD1 Test point of PGOOD1 pin
TP5
PGOOD2 Test point of PGOOD2 pin
D1
Channel-1 Power-Good indicator. Green when VOUT1 is in regulation.
D2
Channel-2 Power-Good indicator. Green when VOUT2 is in regulation.
LINEAR REGULATORS
TP14
LDO5
LDO5 linear regulator positive power output
TP15
GND
LDO5 linear regulator return power output
SWITCHES
SW1
ON/OFF control of channel-2 dynamic-load generator. Toggle to ON will enable the dynamic load, toggle to OFF will
disable the transient load
SW2
ON/OFF control of channel-1 dynamic-load generator. Toggle to ON will enable the dynamic load, toggle OFF will
disable the transient load
U2
ON: High level for EN1, EN2, and FCCM, respectively
OFF: Low level for EN1, EN2, and FCCM, respectively
2
AN1398.0
July 31, 2008
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