Datasheet

V
OUT
RT/SD
FB
VIN
SW
RTN
BST
L1
C2
R5
R6
R1
C4
C3
6V to 75V
Input
LM34923
R7
C1
GND
VCC
V
IN
GND
UV
R2
R3
UVO
R4
TP3
STATUS
3.01 k:
191 k:
82 PH
100 k:
5V
1 PF
0:
15 PF
2.2 PF
0.01
PF
0.1
PF
C5
200 k:
59 k:
R9
0:
C6
3300
pF
R8
36.5 k:
C7
0.1 PF
C8
Scope TP4
V
OUT
Scope
TP5
TP1
SD
TP2
UVO
SW
1000 pF
C9
D1
3.01 k:
Monitor the Inductor Current www.ti.com
Figure 6. Complete Evaluation Board Schematic (As Supplied)
7 Monitor the Inductor Current
The inductor’s current can be monitored or viewed on a scope with a current probe. Remove R9, and
install an appropriate current loop across the two large pads where R9 was located. In this way the
inductor’s ripple current and peak current can be accurately determined.
8 Scope Probe Adapters
Scope probe adapters are provided on this evaluation board for monitoring the waveform at the SW pin,
and at the circuit’s output (V
OUT
), without using the probe’s ground lead that can pick up noise from the
switching waveforms.
6
AN-2147 LM34923 Evaluation Board SNVA482A–May 2011–Revised April 2013
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