MAX712CSE データシートの表示（PDF） - Maxim Integrated
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MAX712CSE Datasheet PDF : 17 Pages
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HOT
+2.0V
COLD
REF
R3
THI
R4
TEMP
TLO
IN THERMAL
CONTACT WITH
BATTERY
T1
AMBIENT
0.022μF TEMPERATURE
R5
T2
MAX712
MAX713
BATT-
T3 0.022μF 1μF
AMBIENT
TEMPERATURE
NOTE: FOR ABSOLUTE TEMPERATURE CHARGE CUTOFF, T2 AND T3 CAN BE
REPLACED BY STANDARD RESISTORS.
Figure 9a. Temperature Comparators
NiCd/NiMH Battery
Fast-Charge Controllers
Some battery packs come with a temperature-detect-
ing thermistor connected to the battery pack’s negative
terminal. In this case, use the configuration shown in
Figure 9b. Thermistors T2 and T3 can be replaced by
standard resistors if absolute temperature charge cut-
off is acceptable. All resistance values in Figures 9a
and 9b should be chosen in the 10kΩ to 500kΩ range.
__________Applications Information
Battery-Charging Examples
Figures 13 and 14 show the results of charging 3 AA,
1000mAh, NiMH batteries from Gold Peak (part no.
GP1000AAH, GP Batteries (619) 438-2202) at a 1A rate
using the MAX712 and MAX713, respectively. The
Typical Operating Circuit is used with Figure 9a’s
thermistor configuration .
DC IN = Sony AC-190 +9VDC at 800mA AC-DC adapter
PGM0 = V+, PGM1 = REF, PGM2 = REF, PGM3 = REF
R1 = 200Ω, R2 = 150Ω, RSENSE = 0.25Ω
C1 = 1µF, C2 = 0.01µF, C3 = 10µF, VLIMIT = REF
R3 = 10kΩ, R4 = 15kΩ
T1, T2 = part #14A1002 (Alpha Sensors: 858-549-4660) R5
omitted, T3 omitted, TLO = BATT-
AMBIENT
TEMPERATURE
REF
T2
THI
HOT
R5
R3
+2.0V
COLD
TEMP
TLO
0.022μF 0.022μF
1μF
R4
MAX712
MAX713
BATT-
T1
T3
IN THERMAL
AMBIENT
CONTACT WITH TEMPERATURE
BATTERY
NOTE: FOR ABSOLUTE TEMPERATURE CHARGE CUTOFF, T2 AND T3 CAN BE
REPLACED BY STANDARD RESISTORS.
Figure 9b. Alternative Temperature Comparator Configuration
11
10
HIGH PEAK
9
8
120Hz RIPPLE
7
LOW PEAK
6
0
200 400 600 800 1000
LOAD CURRENT (mA)
Figure 10. Sony Radio AC Adapter AC-190 Load Characteristic,
9VDC 800mA
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