Datasheet

MAX17595/MAX17596/MAX17597
Peak-Current-Mode Controllers for
Flyback and Boost Regulators
5Maxim 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)
Note 2: All devices 100% production tested at T
A
= +25°C. Limits over temperature are guaranteed by design.
Note 3: The MAX17595 is intended for use in universal input power supplies. The internal clamp circuit at V
IN
is used to prevent
the bootstrap capacitor from charging to a voltage beyond the absolute maximum rating of the device when EN is low
(shutdown mode). Externally limit the maximum current to V
IN
(hence to clamp) to 2mA (max) when EN is low.
Note 4: Using an external clock for synchronization increases the maximum duty cycle by a factor equal to f
SYNC
/ f
SW
for the
MAX17595/MAX17596. External synchronization is not available for the MAX17597.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Slope Voltage Range
for Default Slope
Compensation
4 V
Slope Voltage Range
for Programmable Slope
Compensation
0.2 2 V
Slope Compensation Ramp
RSLOPE = 100kW
140 165 190
mV/Fs
Default Slope
Compensation Ramp
4V < VSLOPE 50
mV/Fs
PWM COMPARATOR
Comparator Offset Voltage VPWM-OS VCOMP, when VCS = 0 1.65 1.81 2 V
Current-Sense Gain ACS-PWM
DVCOMP/DVCS
1.75 1.97 2.15 V/V
Comparator Propagation
Delay
tPWM
Change in VCS = 10mV (including internal lead-
edge blanking)
110 ns
ERROR AMPLIFIER
FB Reference Voltage VREF VFB, when ICOMP = 0 and VCOMP = 1.8V 1.19 1.21 1.23 V
FB Input Bias Current IFB
VFB = 1.5V, TA = +25NC
-100 +100 nA
Voltage Gain AEAMP 90 dB
Transconductance Gm 1.5 1.8 2.1 mS
Transconductance
Bandwidth
BW Open-loop (gain = 1), -3dB frequency 10 MHz
Source Current VCOMP = 1.8V, VFB = 1V 80 120 210
FA
Sink Current VCOMP = 1.8V, VFB = 1.75V 80 120 210
FA
THERMAL SHUTDOWN
Thermal-Shutdown
Threshold
Temperature rising +160
NC
Thermal-Shutdown
Hysteresis
20
NC