Rainbow Electronics MAX1847 - Manual (Page 5)

MAX1846/MAX1847
High-Efficiency, Current-Mode,
Inverting PWM Controller
_______________________________________________________________________________________ 5
100
0
1 10 100 1000 10,000
EFFICIENCY vs. LOAD CURRENT
20
MAX1846/7 toc01
LOAD CURRENT (mA)
EFFICIENCY (%)
40
60
80
70
50
30
10
90
V IN = 5V
V IN = 16.5V
V OUT = -5V APPLICATION CIRCUIT A
100
0
1 10 100 1000 10,000
EFFICIENCY vs. LOAD CURRENT
20
MAX1846/7 toc02
LOAD CURRENT (mA)
EFFICIENCY (%)
40
60
80
70
50
30
10
90
V IN = 5V
V IN = 3.3V
V OUT = -12V APPLICATION CIRCUIT B
V IN = 3V
90
0
1 1000 100 10
EFFICIENCY vs. LOAD CURRENT
30
10
70
50
100
40
20
80
60
MAX1846/7 toc03
LOAD CURRENT (mA)
EFFICIENCY (%)
V IN = 12V
V IN = 16.5V
APPLICATION CIRCUIT C
V OUT = -48V
-12.10
-12.04
-12.06
-12.08
-12.02
-12.00
-11.98
-11.96
-11.94
-11.92
-11.90
0 200 100 300 400 500 600
OUTPUT VOLTAGE LOAD REGULATION
MAX1846/7 toc04
LOAD CURRENT (mA)
OUTPUT VOLTAGE (V)
APPLICATION CIRCUIT B V IN = 5V
0
0.4
0.2
0.8
0.6
1.0
1.2
1.4
1.6
0 4 6 2 8 10 12 14 16
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX1846/7 toc05
V IN (V)
I IN
(mA)
V FB = -0.1V
1.238
1.246
1.242
1.254
1.250
1.258
1.262
-40 20 40 -20 0 60 80 100
REFERENCE VOLTAGE
vs. TEMPERATURE
MAX1846/7 toc06
TEMPERATURE ( °C)
V
REF
(V)
Typical Operating Characteristics
(Circuit references are from Table 1 in the Main Application Circuits section, C VL = 0.47µF, C REF = 0.1µF, T A = +25°C, unless otherwise
noted.)
ELECTRICAL CHARACTERISTICS (continued)
(V SHDN = V IN = +12V, SYNC = GND, PGND = GND, R FREQ = 147k Ω ±1%, C
VL = 0.47µF, C REF = 0.1µF, T A = -40°C to +85°C,
unless otherwise noted.) (Note 3)
PARAMETER CONDITIONS MIN MAX UNITS
POL, SYNC Input Current POL, SYNC = GND or VL 40 µA
V SHDN = +5V or GND -12 0
SHDN Input Current
V SHDN = +16.5V 6
µA
EXT OUTPUT
EXT high or low, I EXT = 100mA, V IN = +5V 7.5
EXT On-Resistance
EXT high or low, I EXT = 100mA, V IN = +3V 12
Ω
Note 3: Parameters to -40°C are guaranteed by design and characterization.