Typical operating characteristics (continued) – Rainbow Electronics MAX5974D User Manual
Page 9
MAX5974A/MAX5974B/MAX5974C/MAX5974D
Active-Clamped, Spread-Spectrum,
Current-Mode PWM Controllers
9
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.)
TRANSCONDUCTANCE
vs. TEMPERATURE
MAX5974A/B/C/D toc28
TEMPERATURE (°C)
TRANSCONDUCTANCE (mS)
60
35
10
-15
2.1
2.2
2.3
2.4
2.5
2.6
2.7
2.8
2.9
3.0
2.0
-40
85
MAX5974C/MAX5974D
MAX5974A/MAX5974B
TRANSCONDUCTANCE HISTOGRAM
(MAX5974A/MAX5974B)
MAX5974A/B/C/D toc29
TRANSCONDUCTANCE (mS)
N (%)
2.64
2.62
2.60
2.58
2.56
2.54
2.52
2.50
2.48
2.46
5
10
15
20
25
0
2.44
TRANSCONDUCTANCE HISTOGRAM
(MAX5974C/MAX5974D)
MAX5974A/B/C/D toc30
TRANSCONDUCTANCE (mS)
N (%)
2.76
2.74
2.72
2.70
2.68
2.66
2.64
2.62
2.60
2.58
5
10
15
20
25
0
2.56
ENABLE RESPONSE
MAX5974A/B/C/D toc31
1ms/div
V
EN
2V/div
V
NDRV
20V/div
V
AUXDRV
20V/div
V
OUT
5V/div
MAX5974C
SHUTDOWN RESPONSE
MAX5974A/B/C/D toc32
4µs/div
V
EN
2V/div
V
NDRV
10V/div
V
AUXDRV
10V/div
V
OUT
5V/div
SHUTDOWN RESPONSE
MAX5974A/B/C/D toc33
100µs/div
V
EN
2V/div
V
NDRV
10V/div
V
AUXDRV
10V/div
V
OUT
5V/div
V
SS
RAMP RESPONSE
MAX5974A/B/C/D toc34
10µs/div
V
SS
2V/div
V
NDRV
10V/div
V
AUXDRV
10V/div