Datasheet

MAX17497A/MAX17497B
AC-DC and DC-DC Peak Current-Mode Converters
with Integrated Step-Down Regulator
3Maxim Integrated
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= +15V, V
EN/UVLO
= +2V, COMPF = open, C
IN
= 1FF, C
VCC
= 1FF, T
A
= T
J
= -40NC to +125NC, unless otherwise noted. Typical
values are at T
A
= +25NC.) (Note 1)
PARAMETER CONDITIONS MIN TYP MAX UNITS
FLYBACK/BOOST CONVERTER
Flyback/Boost Switching
Frequency
MAX17497A 235 250 265
kHz
MAX17497B 470 500 530
Flyback/Boost Maximum Duty
Cycle
f
SW
= 250kHz (MAX17497A) 92 94.5 97
%
f
SW
= 500kHz (MAX17497B) 90 92 94
SSF Pullup Current V
SSF
= 400mV 9 10 11
FA
SSF Set Point Voltage 1.12 1.22 1.24 V
SSF Peak Current-Limit Enable
Threshold
1.11 1.17 1.21 V
EAFN Regulation Point 1.2 1.22 1.24 V
EAFN Input Bias Current
0V < V
EAFN
< 1.5V, T
A
= +25NC
-100 +100 nA
Error-Amplifier Open-Loop
Voltage Gain
90 dB
Error-Amplifier Transconductance V
COMPF
= 2V, V
RLIMF
= 1V 1.5 1.8 2.1 mS
Error-Amplifier Source Current V
COMPF
= 2V, V
EAFN
= 1V 80 120 210
FA
Error-Amplifier Sink Current V
COMPF
= 2V, V
EAFN
= 1.5V 80 120 210
FA
Current-Sense Transresistance 0.45 0.5 0.55
I
IN Clamp Voltage
EN/UVLO = SGND, I
IN_
= 1mA (MAX17497A)
(Note 2)
31 33.5 36 V
LXF DMOS Switch On-Resistance
(R
DSON_LXF
)
I
LXF
= 200mA 175 380
mI
LXF DMOS Peak Current Limit RLIMF = 100K 1.62 1.9 2.23 A
LXF DMOS Runaway Current
Limit
RLIMF = 100K 1.9 2.3 2.6 A
LXF Leakage Current
V
LXF
= 65V, T
A
= +25NC
0.1 2
FA
Peak Switch Current Limit with
RLIMF Open
0.35 0.45 0.54 A
Runaway Switch Current Limit
with RLIMF Open
0.39 0.5 0.6 A
RLIMF Reference Current 9 10 11
FA
Number of Flyback/Boost
Runaway Current-Limit Hits
Before Hiccup Timeout
1 #
Flyback/Boost Overcurrent
Hiccup Timeout
32 ms