Rainbow Electronics MAX5068 - Manual (Page 7)

MAX5068
High-Frequency, Current-Mode PWM Controller
with Accurate Programmable Oscillator
_______________________________________________________________________________________ 7
FLTINT CURRENT vs. TEMPERATURE
MAX5068 toc19
TEMPERATURE ( ° C)
FLTINT CURRENT (
µ A)
85 60 35 10 -15
62.2
62.1
62.4
62.3
62.6
62.5
62.8
62.7
62.9
63.0
62.0
-40 110
HYST R ON vs. TEMPERATURE
MAX5068 toc20
TEMPERATURE ( ° C)
R
ON
(
Ω
)
85 60 35 10 -15
9.0
8.5
10.0
9.5
11.0
10.5
12.0
11.5
12.5
13.0
8.0
-40 110
V IN = 24V
SINKING 50mA
NDRV SWITCHING FREQUENCY (f SW )
vs. R RT
MAX5068 toc21
R RT (M Ω )
f SW
(MHz)
0.1 1
0.1
1
2
0.01
0.03 2
MAX5068A/B
MAX5068C/D/E/F
NDRV SWITCHING FREQUENCY
vs. TEMPERATURE
MAX5068 toc22
TEMPERATURE ( ° C)
NDRV SWITCHING FREQUENCY (kHz)
110 85 35 60 10 -15
48.4
48.8
49.2
49.6
50.0
50.4
50.8
51.2
51.6
52.0
48.0
-40
f SW = 50kHz
NDRV SWITCHING FREQUENCY
vs. TEMPERATURE
MAX5068 toc23
TEMPERATURE ( ° C)
NDRV SWITCHING FREQUENCY (kHz)
100 125 75 50 25 0 -25
497
496
498
500
499
502
501
504
503
505
495
-50
f SW = 500kHz
NDRV SWITCHING FREQUENCY
vs. TEMPERATURE
MAX5068 toc24
TEMPERATURE ( ° C)
NDRV SWITCHING FREQUENCY (kHz)
110 85 60 35 10 -15
1.15
1.20
1.25
1.30
1.35
1.40
1.10
-40
MAX5068A/B
f
SW = 1.25MHz
DEAD TIME vs. TEMPERATURE
MAX5068 toc25
TEMPERATURE ( ° C)
TIME (ns)
110 85 60 35 10 -15
45
50
55
60
65
70
40
-40
V IN = 24V
R DT = 24.9k Ω
R RT = 100k Ω
DEAD TIME vs. R DT
MAX5068 toc26
R
DT
(k Ω )
TIME (ns)
10
20
40
60
80
100
120
140
160
180
200
0
1 100
Typical Operating Characteristics (continued)
(V
IN
= +12V for the MAX5068B/E/F; V
IN
= +23.6V for MAX5068A/C/D at startup, then reduces to +12V; C
IN
= C
REG5
= 0.1µF;
C VCC = 1µF; R RT = 100k
Ω
; NDRV = floating; V FB = 0; V COMP = floating; V CS = 0; T A = +25°C, unless otherwise noted.)