1.2MHz Low-Cost,
High-Performance Chargers
Typical Operating Characteristics
(Circuit of Figure 1, adapter = 19V, battery = 10V, ISET = 1.05V, V CTL = GND, T A = +25 ° C, unless otherwise noted.)
IINP DC ERROR
IINP ERROR
10
8
6
vs. SYSTEM CURRENT
10
8
6
vs. SYSTEM CURRENT
3.0
2.5
ISET PWM DUTY-CYCLE CHANGE
4
2
0
-2
-4
4
2
0
-2
-4
V BATT = 16.8V
2.0
1.5
1.0
-6
-6
V BATT = 12.6V
V BATT = 8.4V
0.5
-8
-8
-10
-10
0
0
1
2
3
4
5
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
0
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
3.5
3.0
SYSTEM CURRENT (A)
ISET PWM DUTY-CYCLE CHANGE
3.0
2.5
SYSTEM CURRENT (A)
ISET PWM FREQUENCY SWEEP
0
-0.1
DUTY CYCLE
BATTERY VOLTAGE-SETTING ERROR
2.5
2.0
DUTY CYCLE = 75%
-0.2
2.0
1.5
-0.3
1.5
1.0
0.5
0
1.0
0.5
0
DUTY CYCLE = 25%
-0.4
-0.5
-0.6
0
10 20 30 40 50 60 70 80 90 100
0
100 200 300 400 500 600 700 800
0
0.5 1.0 1.5 2.0 2.5 3.0
3.5 4.0 4.5
DUTY CYCLE
SYSTEM LOAD TRANSIENT
MAX17005 toc07
SYSTEM
CURRENT
5A/div
FREQUENCY (kHz)
100
95
90
EFFICIENCY
vs. CHARGE CURRENT
VCTL (V)
CHARGING
85
80
3 CELLS
2 CELLS
CURRENT
5A/div
INDUCTOR
CURRENT
5A/div
75
70
65
4 CELLS
200 μ s/div
60
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
CHARGE CURRENT (A)
_______________________________________________________________________________________
7
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