Datasheet

7Maxim Integrated
Active-Clamped, Spread-Spectrum,
Current-Mode PWM Controllers
MAX5974A/MAX5974B/MAX5974C/MAX5974D
Typical Operating Characteristics
(V
IN
= 12V (for MAX5974A/MAX5974C, bring V
IN
up to 17V 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.)
TEMPERATURE (°C)
IN UVLO WAKE-UP LEVEL (V)
603510-15
15.8
15.9
16.0
16.1
16.2
16.3
15.7
-40 85
IN UVLO WAKE-UP LEVEL
vs. TEMPERATURE
MAX5974A/B/C/D toc01
MAX5974A/MAX5974C
TEMPERATURE (°C)
IN UVLO WAKE-UP LEVEL (V)
603510-15
8.1
8.2
8.3
8.4
8.5
8.6
8.0
-40 85
IN UVLO WAKE-UP LEVEL
vs. TEMPERATURE
MAX5974A/B/C/D toc02
MAX5974B/MAX5974D
IN UVLO SHUTDOWN LEVEL
vs. TEMPERATURE
MAX5974A/B/C/D toc03
TEMPERATURE (°C)
IN UVLO SHUTDOWN LEVEL
603510-15
6.9
7.0
7.1
7.2
7.3
6.8
-40 85
EN RISING THRESHOLD
vs. TEMPERATURE
MAX5974A/B/C/D toc04
TEMPERATURE (°C)
EN RISING THRESHOLD (V)
603510-15
1.212
1.214
1.216
1.218
1.220
1.210
-40 85
EN FALLING THRESHOLD
vs. TEMEPRATURE
MAX5974A/B/C/D toc05
TEMPERATURE (°C)
EN FALLING THRESHOLD (V)
6035-15 10
1.143
1.144
1.145
1.146
1.148
1.147
1.149
1.150
1.142
-40 85
UVLO SHUTDOWN CURRENT
vs. TEMPERATURE
MAX5974A/B/C/D toc06
TEMPERATURE (°C)
UVLO CURRENT (µA)
603510-15
80
100
120
140
60
-40 85
MAX5974A/MAX5974C
MAX5974B/MAX5974D
SUPPLY CURRENT vs. SUPPLY VOLTAGE
(MAX5974A/MAX5974C)
MAX5974A/B/C/D toc07
TEMPERATURE (°C)
SUPPLY CURRENT (µA)
18161412108642
100
1000
10,000
10
02
0
T
A
= -40°C
T
A
= +85°C
SUPPLY CURRENT vs. SUPPLY VOLTAGE
(MAX5974B/MAX5974D)
MAX5974A/B/C/D toc08
TEMPERATURE (°C)
SUPPLY CURRENT (µA)
18161412108642
100
1000
10,000
10
02
0
T
A
= -40°C
T
A
= +85°C
SUPPLY CURRENT
vs. SWITCHING FREQUENCY
MAX5974A/B/C/D toc09
SWITCHING FREQUENCY (kHz)
SUPPLY CURRENT (mA)
700600500400300200100
0.4
0.8
1.2
1.6
2.0
2.4
0
0 800