Datasheet

MAX17598/MAX17599
Low I
Q
, Wide-Input Range, Active Clamp
Current-Mode PWM Controllers
4Maxim Integrated
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= 12V (for MAX17598, bring V
IN
up to 21V for startup), V
CS
= V
DITHER
= V
FB
= V
OVI
= V
SGND
= V
PGND
= 0V, V
EN/UVLO
= +2V,
AUXDRV = NDRV = SS = COMP = SLOPE = unconnected, R
RT
= 25kI, R
DT
= 10kI, C
VIN
= 1FF, C
VDRV
= 1FF, T
A
= T
J
= -40NC to
+125NC, unless otherwise noted. Typical values are at T
A
= T
J
= +25NC.) (Note 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
SOFT-START/SOFT-STOP (SS)
Soft-Start Charging Current I
SSCH
9 10 11 FA
Soft-Stop Discharging
Current
I
SSDISCH
4.4 5 5.6 FA
SS Bias Voltage V
SS
1.19 1.21 1.23 V
SS Discharge Threshold V
SSDISCH
Soft-stop completion 0.15 V
NDRV DRIVER (NDRV)
Pulldown Impedance R
NDRV-N
I
NDRV
(sinking) = 100mA 1.37 3
I
Pullup Impedance R
NDRV-P
I
NDRV
(sourcing) = 50mA 4.26 8.5
I
Peak Sink Current C
NDRV
= 10nF 1.5 A
Peak Source Current C
NDRV
= 10nF 0.9 A
Fall Time t
NDRV-F
C
NDRV
= 1nF 10 ns
Rise Time t
NDRV-R
C
NDRV
= 1nF 20 ns
AUXDRV DRIVER (AUXDRV)
Pulldown Impedance R
AUXDRV-N
I
AUXDRV
(sinking) = 100mA 3.35 7
I
Pullup Impedance R
AUXDRV-P
I
AUXDRV
(sourcing) = 50mA 9.78 19
I
Peak Sink Current C
AUXDRV
= 10nF 0.7 A
Peak Source Current C
AUXDRV
= 10nF 0.3 A
Fall Time t
AUXDRV-F
C
AUXDRV
= 1nF 16 ns
Rise Time t
AUXDRV-R
C
AUXDRV
= 1nF 32 ns
DEAD TIME (DT)
NDRV to AUXDRV Delay
(Dead Time)
t
DT
NDRV$ to AUXDRV$
R
DT
= 10kI 25
ns
R
DT
= 100kI 250
AUXDRV# to NDRV#
R
DT
= 10kI 25
R
DT
= 100kI 250
CURRENT-LIMIT COMPARATOR (CS)
Cycle-by-Cycle Peak-
Current-Limit Threshold
V
CS-PEAK
290 305 320 mV
Cycle-by-Cycle Runaway-
Current-Limit Threshold
V
CS-RUN
340 360 380 mV
Cycle-by-Cycle Reverse-
Current-Limit Threshold
V
CS-REV
-122 -102 -82 mV