Rainbow Electronics MAX5051 - Manual (Page 8)

MAX5051
Parallelable, Clamped Two-Switch
Power-Supply Controller IC
8 _______________________________________________________________________________________
CURRENT-LIMIT THRESHOLD
vs. TEMPERATURE
MAX5051 toc19
TEMPERATURE ( °C)
CS THRESHOLD VOLTAGE (mV)
100 75 50 25 0 -25
145
150
155
160
165
170
140
-50 125
-20
0
20
40
60
80
100 270
240
210
180
150
120
90
60
30
0
OPEN-LOOP GAIN/PHASE
vs. FREQUENCY
FREQUENCY (kHz)
0.01 10 100 1000 0.1 1 10,000
GAIN (dB)
PHASE (DEGREES)
MAX5051 toc20
GAIN
PHASE
COMP OUTPUT VOLTAGE
vs. TEMPERATURE
MAX5051 toc21
TEMPERATURE ( °C)
COMP OUTPUT VOLTAGE (V)
100 75 -25 0 25 50
1
2
3
4
5
6
7
8
0
-50 125
I
SOURCE
= 5mA
I SINK = 5mA
DRVH AND DRVL R DSON
vs. TEMPERATURE
MAX5051 toc22
TEMPERATURE ( °C)
R
DSON
(Ω
)
100 75 -25 0 25 50
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
0
-50 125
DRVH AND DRVL SOURCING 50mA
DRVH AND DRVL SINKING 50mA
LXL AND LXH R DSON
vs. TEMPERATURE
MAX5051 toc23
TEMPERATURE ( °C)
R
DSON
(Ω
)
85 60 -15 10 35
5
6
7
8
9
10
11
12
4
-40 110
LXH SOURCING 10mA
LXH SINKING 10mA
SWITCHING PERIOD vs. R RCOSC
MAX5051 toc24
R RCOSC (k Ω)
SWITCHING PERIOD (
µ
s)
160 120 80 40
5
10
15
20
25
30
35
40
45
50
0
0 200
NORMALIZED SWITCHING FREQUENCY
vs. TEMPERATURE
MAX5051 toc25
TEMPERATURE ( °C)
NORMALIZED SWITCHING FREQUENCY
100 75 50 25 0 -25
0.960
0.970
0.980
0.990
1.000
1.010
1.020
0.950
-50 125
SWITCHING
SYNCIN TO SYNCOUT PROPAGATION
DELAY vs. TEMPERATURE
MAX5051 toc26
TEMPERATURE ( °C)
PROPAGATION DELAY (ns)
100 75 25 50 0 -25
40
50
60
70
80
90
100
110
120
130
30
-50 125
SYNCIN FALL TO SYNCOUT RISE
SYNCIN RISE TO SYNCOUT FALL
DRVH MAXIMUM DUTY CYCLE
vs. TEMPERATURE
MAX5051 toc27
TEMPERATURE ( °C)
DRVH DUTY CYCLE (%)
100 75 25 50 0 -25
46.4
46.8
47.2
47.6
48.0
48.4
48.8
49.2
49.6
50.0
46.0
-50 125
Typical Operating Characteristics (continued)
(V AVIN = V PVIN = 12V, V UVLO = V STT = 3V, V CON = 3V, R RCOSC = 24k Ω, C
CSS = 10nF, C RCOSC = 100pF, C REG9 = 4.7µF, C REG5 =
4.7µF, T
A
= +25°C, unless otherwise noted.)