Datasheet

MAX17598/MAX17599
Low I
Q
, Wide-Input Range, Active Clamp
Current-Mode PWM Controllers
5Maxim 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
Current-Sense Leading-Edge
Blanking Time
t
CS-BLANK
From NDRV# edge 70 ns
Current-Sense-Blanking Time
for Reverse-Current Limit
t
CS-BLANK-
Rev
From AUXDRV$ edge 70 ns
Propagation Delay from
Comparator Input to NDRV
t
PDCS
From CS rising (10mV overdrive) to
NDRV falling (excluding leading-edge
blanking)
40 ns
Number of Consecutive
Peak-Current-Limit Events to
HICCUP
N
HICCUP-P
8
event
Number of Runaway Current-
Limit Events to HICCUP
N
-HICCUP-R
1 event
Overcurrent Hiccup Timeout 32,768 cycle
Minimum On-Time t
ON-MIN
90 130 170 ns
SLOPE COMPENSATION (SLOPE)
Slope Bias Current I
SLOPE
9 10 11 FA
Slope Resistor Range R
SLOPE
25 200 kI
Slope Compensation Ramp R
SLOPE
= 100kW 140 165 190 mV/Fs
Default Slope Compensation
Ramp
V
SLOPE
< 0.2V or 4V < V
SLOPE
50 mV/Fs
PWM COMPARATOR
Comparator Offset Voltage V
PWM-OS
V
COMP,
when V
CS
= 0V 1.65 1.81 2 V
Current-Sense Gain A
CS-PWM
DV
COMP
/DV
CS
1.75 1.97 2.15 V/V
Comparator Propagation
Delay
t
PWM
Change in V
CS
= 10mV (including
internal lead-edge blanking)
110 ns
ERROR AMPLIFIER
FB Reference Voltage V
REF
V
FB
, when I
COMP
= 0V
and V
COMP
= 1.8V
1.19 1.21 1.23 V
FB Input Bias Current I
FB
V
FB
= 1.5V, T
A
= +25NC -100 +100 nA
Open-Loop Voltage Gain A
EAMP
90 dB
Transconductance Gm 1.5 1.8 2.1 mS