Rainbow Electronics MAX5974D - Manual (Page 8)

MAX5974A/MAX5974B/MAX5974C/MAX5974D
Active-Clamped, Spread-Spectrum,
Current-Mode PWM Controllers
8
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.)
DEAD TIME vs. R DT VALUE
MAX5974A/B/C/D toc19
R DT VALUE (k Ω)
DEAD TIME (ns)
90 80 20 30 40 60 50 70
50
100
150
200
250
300
350
400
0
10 100
DEAD TIME vs. TEMPERATURE
MAX5974A/B/C/D toc20
TEMPERATURE (°C)
DEAD TIME (ns)
110 85 60 35 10 -15
90
92
94
96
98
100
102
88
-40
PEAK CURRENT-LIMIT THRESHOLD
vs. TEMPERATURE
MAX5974A/B/C/D toc21
TEMPERATURE (°C)
PEAK CURRENT-LIMIT THRESHOLD (mV)
60 35 10 -15
389
390
391
392
393
394
395
396
397
398
388
-40 85
REVERSE CURRENT-LIMIT THRESHOLD
vs. TEMPERATURE
MAX5974A/B/C/D toc22
TEMPERATURE (°C)
REVERSE CURRENT-LIMIT THRESHOLD (mV)
60 35 10 -15
-106
-105
-104
-103
-102
-101
-100
-99
-98
-97
-107
-40 85
SLOPE COMPENSATION CURRENT
vs. TEMPERATURE
MAX5974A/B/C/D toc23
TEMPERATURE (°C)
SLOPE COMPENSATION CURRENT (mA)
60 35 -15 10
50.5
51.0
51.5
52.0
53.0
52.5
53.5
54.0
50.0
-40 85
NDRV MINIMUM ON-TIME
vs. TEMPERATURE
MAX5974A/B/C/D toc24
TEMPERATURE (°C)
NDRV MINIMUM ON-TIME (ns)
60 35 10 -15
145
150
155
160
165
170
140
-40 85
CURRENT-SENSE GAIN
vs. TEMPERATURE
MAX5974A/B/C/D toc25
TEMPERATURE (°C)
CURRENT-SENSE GAIN (V/V)
60 35 10 -15
3.31
3.32
3.33
3.34
3.35
3.36
3.37
3.38
3.39
3.40
3.30
-40 85
FEEDBACK VOLTAGE
vs. TEMPERATURE
MAX5974A/B/C/D toc26
TEMPERATURE (°C)
FEEDBACK VOLTAGE (V)
60 35 10 -15
1.211
1.212
1.213
1.214
1.215
1.216
1.217
1.218
1.219
1.220
1.210
-40 85
MAX5974C/MAX5974D
FEEDBACK VOLTAGE
vs. TEMPERATURE
MAX5974A/B/C/D toc27
TEMPERATURE (°C)
FEEDBACK VOLTAGE (V)
60 35 10 -15
1.517
1.518
1.519
1.520
1.521
1.522
1.516
-40 85