Datasheet

MAX17595/MAX17596/MAX17597
Peak-Current-Mode Controllers for
Flyback and Boost Regulators
4Maxim Integrated
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= 12V (for the MAX17595, bring V
IN
up to 21V for startup), V
CS
= V
SLOPE
= V
DITHER
= V
FB
= V
OVI
= V
SGND
= V
PGND
= 0V,
V
EN/UVLO
= +2V; NDRV, SS, COMP are unconnected, R
RT
= 25kI, 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 (SS)
Soft-Start Charging Current ISSCH 9 10 11
FA
SS Bias Voltage VSS 1.19 1.21 1.23 V
NDRV DRIVER (NDRV)
Pulldown Impedance RNDRV-N INDRV (sinking) = 100mA 1.37 3
I
Pullup Impedance RNDRV-P INDRV (sourcing) = 50mA 4.26 8.5
I
Peak Sink Current CNDRV = 10nF 1.5 A
Peak Source Current CNDRV = 10nF 0.9 A
Fall Time tNDRV-F CNDRV = 1nF 10 ns
Rise Time tNDRV-R CNDRV = 1nF 20 ns
CURRENT-LIMIT COMPARATOR (CS)
Cycle-by-Cycle Peak
Current-Limit Threshold
VCS-PEAK 290 305 320 mV
Cycle-by-Cycle Runaway
Current-Limit Threshold
VCS-RUN 340 360 380 mV
Current-Sense Leading-
Edge Blanking Time
tCS-BLANK
From NDRV rising # edge
70 ns
Propagation Delay from
Comparator Input to NDRV
tPDCS
From CS rising (10mV overdrive) to
NDRV falling (excluding leading
edge blanking)
40 ns
Number of Consecutive
Peak- Current-Limit Events
to Hiccup
NHICCUP-P 8 events
Number of Runaway-
Current-Limit Events to
Hiccup
NHICCUP-R 1 event
Overcurrent Hiccup
Timeout
32,768 cycle
Minimum On-Time tON-MIN 90 130 170 ns
SLOPE COMPENSATION (SLOPE)
Slope Bias Current ISLOPE 9 10 11
FA
Slope Resistor Range 25 200
kI