Datasheet

LTC6992-1/LTC6992-2/
LTC6992-3/LTC6992-4
23
69921234fc
Typical applicaTions
Figure 14. Supply Bypassing and PCB Layout
Constant On-Time Modulator
6992 TA02
LTC6992-1
MOD
GND
SET
OUT
V
+
DIV
R
M2
9.31k
R
M1
1.05k
R
SET
44.2k
R
IN
*
11.8k
V
CTRL
V
MOD
V
SET
V
IN
0V TO 2V
R1
182k
DIVCODE = 2
(÷16, POL = 1)
C1
0.1µF
OUT
R2
976k
V
CC
*OPTIONAL RESISTOR ADJUSTS FOR DESIRED V
IN
RANGE.
AS V
IN
INCREASES, t
OUT
INCREASES AND DUTY CYCLE
DECREASES (BECAUSE POL = 1) TO MAINTAIN A CONSTANT t
ON
.
FOR CONSTANT OFF-TIME, JUST CHANGE DIVCODE SO POL = 0.
IF
R
M2
R
M1
+R
M2
= 0.9 THEN t
ON
= N
DIV
• 1.125µs •
R
SET
50k
applicaTions inForMaTion
6992 F14
LTC6992
MOD
GND
SET
OUT
V
+
DIV
C1
0.1µF
R1
R2
R
SET
V
+
MOD
GND
SET
OUT
V
+
DIV
V
+
DIV
SET
OUT
GND
MOD
R1
R2
C1
R
SET
V
+
C1R1
R2
V
+
R
SET
TSOT-23 PACKAGEDFN PACKAGE