Datasheet

MAX17595/MAX17596/MAX17597
Peak-Current-Mode Controllers for
Flyback and Boost Regulators
3Maxim 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
INTERNAL LDO (VDRV)
VDRV Output Voltage
Range
VDRV
8V < VIN < 15V and 0mA < IVDRV < 50mA
(MAX17595)
7.1 7.4 7.7
V
6V < VIN < 15V and 0mA < IVDRV < 50mA
(MAX17596/MAX17597)
4.7 4.9 5.1
VDRV Current Limit IVDRV-MAX 70 100 mA
VDRV Dropout VVDRV-DO
VIN = 4.5V, IVDRV = 20mA (MAX17596/
MAX17597)
4.2 V
OVERVOLTAGE PROTECTION (OVI)
OVI Overvoltage Threshold
VOVIR
VOVI rising #
1.16 1.21 1.26
V
VOVIF
VOVI falling $
1.1 1.15 1.2
OVI Masking Delay tOVI-MD 2
Fs
OVI Input Leakage Current IOVI
VOVI = 1V, TA = +25NC
-100 +100 nA
OSCILLATOR (RT)
NDRV Switching
Frequency Range
fSW 100 1000 kHz
NDRV Switching
Frequency Accuracy
-8 +8 %
Maximum Duty Cycle DMAX fSW = 400kHz
(MAX17595/MAX17596) 46 48 50
%
(MAX17597) 90 92.5 95
SYNCHRONIZATION (DITHER/SYNC)
Synchronization Logic-High
Input
VHI-SYNC 3 V
Synchronization Pulse
Width
50 ns
Synchronization Frequency
Range
fSYNC (MAX17595/MAX17596) (Note 4) 1.1 x fSW 1.8 x fSW Hz
DITHERING RAMP GENERATOR (DITHER/SYNC)
Charging Current 45 50 55
FA
Discharging Current 43 50 57
FA
Ramp-High Trip Point 2 V
Ramp-Low Trip Point 0.4 V