Rainbow Electronics MAX5974D - Manual (Page 5)

MAX5974A/MAX5974B/MAX5974C/MAX5974D
Active-Clamped, Spread-Spectrum,
Current-Mode PWM Controllers
5
ELECTRICAL CHARACTERISTICS (continued)
(V IN = 12V (for MAX5974A/MAX5974C, bring V IN up to 21V for startup), V CS = V CSSC = V DITHER/SYNC = V FB = V FFB = V DCLMP =
V GND , V EN = +2V, NDRV = AUXDRV = SS = COMP = unconnected, R RT = 34.8kI, R DT = 25kI, C IN = 1FF, T A = -40NC to +85NC,
unless otherwise noted. Typical values are at T A = +25NC.) (Note 2)
Note 2: All devices are 100% production tested at T A = +25NC. Limits over temperature are guaranteed by design.
Note 3: See the Output Short-Circuit Protection with Hiccup Mode section.
Note 4: The parameter is measured at the trip point of latch with V
FB = 0V. Gain is defined as DV COMP /DV CSSC for 0.15V <
D V CSSC < 0.25V.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
ERROR AMPLIFIER
FB Reference Voltage V REF
V FB when I COMP = 0,
V COMP = 2.5V
MAX5974A/
MAX5974B
1.5 1.52 1.54
V
MAX5974C/
MAX5974D
1.202 1.215 1.227
FB Input Bias Current I FB V FB = 0 to 1.75V
MAX5974A/
MAX5974B
-250 +250
nA
MAX5974C/
MAX5974D
-500 +100
Voltage Gain A EAMP 80 dB
Transconductance g M
MAX5974A/
MAX5974B
1.8 2.55 3.2
mS
MAX5974C/
MAX5974D
1.8 2.66 3.5
Transconductance Bandwidth BW
Open loop (typical gain
= 1) -3dB frequency
MAX5974A/
MAX5974B
2
MHz
MAX5974C/
MAX5974D
30
Source Current V FB = 1V, V COMP = 2.5V 300 375 455
F A
Sink Current V FB = 1.75V, V COMP = 1V 300 375 455 F A
FREQUENCY FOLDBACK (FFB)
V
CSAVG
-to-FFB Comparator
Gain
10 V/V
FFB Bias Current I
FFB V FFB = 0V, V CS = 0V (not in FFB mode) 26 30 33 F A
NDRV Switching Frequency
During Foldback
f SW-FB f SW /2 kHz