Rainbow Electronics MAX5068 - Manual (Page 6)

MAX5068
High-Frequency, Current-Mode PWM Controller
with Accurate Programmable Oscillator
6 _______________________________________________________________________________________
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.)
REG5 OUTPUT VOLTAGE vs. V IN
MAX5068 toc10
V IN (V)
REG5 (V)
22 20 16 18 14 12 10 24
4.976
4.977
4.978
4.979
4.980
4.981
4.982
4.983
4.984
4.985
4.975
I REG5 = 100 µ A
CS TRIP THRESHOLD
vs. TEMPERATURE
MAX5068 toc11
TEMPERATURE ( ° C)
CS TRIP THRESHOLD (mV)
110 85 60 35 10 -15
306
303
309
315
312
321
318
327
324
330
300
-40
SWITCHING FREQUENCY
vs. TEMPERATURE
MAX5068 toc12
TEMPERATURE ( ° C)
SWITCHING FREQUENCY (kHz)
110 85 60 35 -15 10
480
475
485
495
490
505
500
515
510
520
470
-40
f SW = 500kHz TOTAL NUMBER OF
DEVICES = 200
MEAN
-3 σ
+3 σ
PROPAGATION DELAY FROM CS COMPARATOR
INPUT TO NDRV vs. TEMPERATURE
MAX5068 toc13
TEMPERATURE ( ° C)
PROPAGATION DELAY (ns)
110 85 35 60 10 -15
32
34
36
38
40
42
44
46
48
50
30
-40
INPUT CURRENT
vs. INPUT CLAMP VOLTAGE
MAX5068 toc14
INPUT CLAMP VOLTAGE (V)
INPUT CURRENT (mA)
27.5 25.0 22.5 20.0 17.5 15.0 12.5
2
4
6
8
10
12
14
0
10.0 30.0
INPUT CLAMP VOLTAGE
vs. TEMPERATURE
MAX5068 toc15
TEMPERATURE ( ° C)
INPUT CLAMP VOLTAGE (V)
110 85 35 60 10 -15
25.2
25.4
25.6
25.8
26.0
26.2
26.4
26.6
26.8
27.0
25.0
-40
I SINK = 2mA
NDRV OUTPUT IMPEDANCE
vs. TEMPERATURE
MAX5068 toc16
TEMPERATURE ( ° C)
R
ON
(
Ω
)
85 60 35 10 -15
1.4
1.2
1.8
1.6
2.2
2.0
2.6
2.4
2.8
3.0
1.0
-40 110
V IN = 24V
SINKING 100mA
NDRV OUTPUT IMPEDANCE
vs. TEMPERATURE
MAX5068 toc17
TEMPERATURE ( ° C)
R
ON
(
Ω
)
85 60 35 10 -15
2.4
2.2
2.8
2.6
3.2
3.0
3.6
3.4
3.8
4.0
2.0
-40 110
V IN = 24V
SOURCING 25mA
ERROR AMPLIFIER OPEN-LOOP GAIN
AND PHASE vs. FREQUENCY
MAX5068 toc18
FREQUENCY (Hz)
GAIN (dB)
PHASE (DEGREES)
10M 10 100k 1k
-20
0
20
40
60
80
100
120
-40
-180
-150
-120
-90
-60
-30
0
30
-210
0.1
GAIN
PHASE