Micrel, Inc.
LM2575
Test Circuits and Layout Guidelines
FEEDBACK
+V
IN
1
7V - 40V
U N R E G U L A TE D +
DC INPUT
100µF
C
IN
G ND
4
OU TPU T
5
2
L1
330µH
D1
MBR360
+
V
OUT
5.00V
C
OUT
470µF
R2
R1
L
O
A
D
C
IN
— 100µF, 75V Aluminum Electrolytic
C
OUT
— 470µF, 15V Aluminum Electrolytic
D1 — Schottky, MBR360
L1 — 330µH, 415-0926 (AIE)
R1 — 1k, 0.01%
R2 — 3.065k, 0.01%
5-pin TO-220 socket—2936 (Loranger Mfg. Co.)
4-pin TO-3 socket—8112-AG7 (Augat Inc.)
LM2575
3 ON/OFF
FEEDBACK
+V
IN
1
7V - 40V
U N R E G U L A TE D +
DC INPUT
100µF
C
IN
LM2575-5.0
3 ON/OFF
5
4
OU TPU T
2
L1
330µH
D1
MBR360
+
V
OUT
5.00V
C
OUT
220µF
L
O
A
D
C
IN
— 100µF, 75V Aluminum Electrolytic
C
OUT
— 330µF, 15V Aluminum Electrolytic
D1 — Schottky, MBR360
L1 — 330µH, 415-0926 (AIE)
5-pin TO-220 socket — 2936 (Loranger Mfg. Co.)
4-pin TO-3 socket — 8112-AG7 (Augat Inc.)
G ND
Not e: Pin numbers are for TO-220 Package
Figure 1.
As in any switching regulator, layout is very important.
Rapidly switching currents associated with wiring
inductance generate voltage transient switch can cause
problems. For minimal stray inductance and ground
loops, the length of the leads indicated by heavy lines
should be kept as short as possible. Single-point
grounding (as indicated) or ground plane construction
should be used for best results.
May 2009
6
M9999-051209-B
MICREL [ MICREL SEMICONDUCTOR ]
