max5974 Maxim Integrated Products, Inc., max5974 Datasheet - Page 10

• Manufacturer Part Number: max5974
• Description: Active-clamped, Spread-spectrum, Current-mode Pwm Controllers
• Manufacturer: Maxim Integrated Products, Inc.

Active-Clamped, Spread-Spectrum,
Current-Mode PWM Controllers
(V
V
10
GND
IN
AUXDRV 10% TO 90% RISE TIME
= 12V (for MAX5974A/MAX5974C, bring V
, V
V
0ns
DCLMP
EN
= 2V, NDRV = AUXDRV = SS = COMP = unconnected, R
RAMP RESPONSE
10µs/div
10ns/div
45.6ns
MAX5974A/B/C/D toc35
MAX5974A/B/C/D toc38
PEAK AUXDRV CURRENT
PEAK SINK CURRENT
400ns/div
V
2V/div
V
10V/div
V
10V/div
V
2V/div
DCLMP
NDRV
AUXDRV
AUXDRV
PEAK SOURCE
CURRENT
MAX5974A/B/C/D toc41
IN
Typical Operating Characteristics (continued)
AUXDRV 90% TO 10% FALL TIME
NDRV 10% TO 90% RISE TIME
up to 21V for startup), V
I
0.2A/div
AUXDRV
0ns
0ns
10ns/div
10ns/div
21ns
RT
MAX5974A/B/C/D toc36
MAX5974A/B/C/D toc39
27.6ns
= 34.8kI, R
CS
= V
SHORT-CIRCUIT BEHAVIOR
V
2V/div
V
2V/div
CSSC
NDRV
AUXDRV
DT
= 25kI, unless otherwise noted. )
= V
40ms/div
DITHER/SYNC
NDRV 90% TO 10% FALL TIME
MAX5974A/B/C/D toc42
PEAK NDRV CURRENT
PEAK SINK CURRENT
0ns
200ns/div
10ns/div
= V
PEAK SOURCE CURRENT
FB
V
V
I
LX
13.8ns
IN
NDRV
= V
MAX5974A/B/C/D toc37
MAX5974A/B/C/D toc40
FFB
= V
DCLMP
V
2V/div
I
0.5A/div
NDRV
NDRV
=