Datasheet

LTC3839
6
3839fa
TYPICAL PERFORMANCE CHARACTERISTICS
Phase Relationship:
PHASMD = Ground
Phase Relationship:
PHASMD = Float
Phase Relationship:
PHASMD = INTV
CC
Overcurrent Protection
Regular Soft Start-Up
Short-Circuit Protection
Soft Start-Up Into
Pre-Biased Output
Overvoltage Protection
Output Tracking
V
OUT
100mV/DIV
AC-COUPLED
5ms/DIV
3839 G12
V
IN
= 12V
V
OUT
= 1.2V
FORCED CONTINUOUS MODE
I
L
5A/DIV
FULL CURRENT LIMIT
WHEN V
OUT
HIGHER
THAN HALF OF REGULATED
V
OUT
1V/DIV
SHORT-
CIRCUIT
TRIGGER
500µs/DIV
3839 G13
V
IN
= 12V
V
OUT
= 1.2V
I
LOAD
= 0A
I
L
10A/DIV
C
OUT
RECHARGE
CURRENT LIMIT STARTS TO FOLD BACK AS
V
OUT
DROPS BELOW HALF OF REGULATED
V
OUT
100mV/DIV
AC-COUPLED
20µs/DIV
3839 G14
V
IN
= 12V
V
OUT
= 1.2V
FORCED CONTINUOUS
MODE
I
LOAD
= 0A
BG STAYS ON UNTIL
V
OUT
IS PULLED
BELOW OVERVOLTAGE
THRESHOLD
I
L
10A/DIV
BG1
5V/DIV
OVERVOLTAGE CREATED BY APPLYING
A CHARGED CAPACITOR TO V
OUT
500ns/DIV
60°
0°
3839 G15
FIGURE 13 CIRCUIT
V
IN
= 12V
LOAD = 0A
MODE/PLLIN = 333kHz EXTERNAL CLOCK
CLKOUT
5V/DIV
SW2
10V/DIV
SW1
10V/DIV
PLLIN
5V/DIV
180°
500ns/DIV
0°
3839 G16
CLKOUT
5V/DIV
SW2
10V/DIV
SW1
10V/DIV
PLLIN
5V/DIV
90°
180°
FIGURE 13 CIRCUIT
V
IN
= 12V
LOAD = 0A
MODE/PLLIN = 333kHz EXTERNAL CLOCK
500ns/DIV
0°
3839 G17
CLKOUT
5V/DIV
SW2
10V/DIV
SW1
10V/DIV
PLLIN
5V/DIV
120°
240°
FIGURE 13 CIRCUIT
V
IN
= 12V
LOAD = 0A
MODE/PLLIN = 333kHz EXTERNAL CLOCK
RUN
5V/DIV
V
OUT
500mV/DIV
1ms/DIV
3839 G09
C
SS
= 10nF
V
IN
= 12V
V
OUT
= 1.2V
FORCED CONTINUOUS MODE
TRACK/SS
200mV/DIV
RUN
5V/DIV
V
OUT
500mV/DIV
1ms/DIV
3839 G10
C
SS
= 10nF
V
IN
= 12V
V
OUT
= 1.2V
V
OUT
PRE-BIASED TO 0.75V
TRACK/SS
200mV/DIV
V
OUT
500mV/DIV
10ms/DIV
3839 G11
V
IN
= 12V
V
OUT
= 1.2V
FORCED CONTINUOUS MODE
TRACK/SS
200mV/DIV