Typical operating characteristics (continued) – Rainbow Electronics MAX5974D User Manual
Page 10
MAX5974A/MAX5974B/MAX5974C/MAX5974D
Active-Clamped, Spread-Spectrum,
Current-Mode PWM Controllers
10
Typical Operating 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, unless otherwise noted.)
V
DCLMP
RAMP RESPONSE
MAX5974A/B/C/D toc35
10µs/div
V
DCLMP
2V/div
V
NDRV
10V/div
V
AUXDRV
10V/div
NDRV 10% TO 90% RISE TIME
MAX5974A/B/C/D toc36
10ns/div
V
NDRV
2V/div
0ns
27.6ns
NDRV 90% TO 10% FALL TIME
MAX5974A/B/C/D toc37
10ns/div
V
NDRV
2V/div
0ns
13.8ns
AUXDRV 10% TO 90% RISE TIME
MAX5974A/B/C/D toc38
10ns/div
V
AUXDRV
2V/div
0ns
45.6ns
AUXDRV 90% TO 10% FALL TIME
MAX5974A/B/C/D toc39
10ns/div
V
AUXDRV
2V/div
0ns
21ns
PEAK NDRV CURRENT
MAX5974A/B/C/D toc40
200ns/div
I
NDRV
0.5A/div
PEAK SOURCE CURRENT
PEAK SINK CURRENT
PEAK AUXDRV CURRENT
MAX5974A/B/C/D toc41
400ns/div
I
AUXDRV
0.2A/div
PEAK SOURCE
CURRENT
PEAK SINK CURRENT
SHORT-CIRCUIT BEHAVIOR
MAX5974A/B/C/D toc42
40ms/div
I
LX
V
IN
V
NDRV