Datasheet

5
LTC1504
PIN FUNCTIONS
UUU
during power-up. C
SS
also compensates the current limit
loop, allowing the LTC1504 to enter and exit current limit
cleanly. See the Applications Information section for more
details.
COMP (Pin 8): External Compensation. An external RC
network should be connected to COMP to compensate the
feedback loop. COMP is connected to the output of the
internal error amplifier.
TEST CIRCUITS

I
MAX
SHDN
SS COMP
V
CC
GND
SW
FB/SENSE
+
C
IN
V
CC
NC
0.01µF
+
C
OUT
V
OUT
L
EXT
C
IN
: AVX TPSE107M016R0125
C
OUT
: SANYO 16CV220GX
L
EXT
: COILCRAFT D03316-473
1504 • TC01
LTC1504
1µF
0.1µF
220pF
7.5k
Figure 1
+
–
V
REF
LTC1504
COMP
FB/SENSE
A
B
A: TEST V
OL
, I
OL

B: TEST V
OH
, I
OH
1504 • TC02
Figure 2
BLOCK DIAGRAM
W
Figure 3. Block Diagram
+
–
+–
+
–
MIN
+–
MAX
+–
FB
–+
I
LIM
+
–
40mV
1.265V
12V
12V
PWM
12.6k
20.4k
Q1
Q2
SW
FB
(ADJ ONLY)
SENSE
(–3.3V ONLY)
SAW
I
MAX
SS
COMP
SHDN
1504 • BD
+
–
40mV
V
REF
V
CC
TO INTERNAL BLOCKS