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SM6780AS Fiches technique(PDF) 10 Page - Nippon Precision Circuits Inc

No de pièce SM6780AS
Description  Ni-Cd/Ni-MH Battery Charger IC
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Fabricant  NPC [Nippon Precision Circuits Inc]
Site Internet  http://www.npc.co.jp/en
Logo NPC - Nippon Precision Circuits Inc

SM6780AS Fiches technique(HTML) 10 Page - Nippon Precision Circuits Inc

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SM6780AS
NIPPON PRECISION CIRCUITS—10
Charging Operating Status
TYPICAL APPLICATION CIRCUIT
Note that the above circuit is an example circuit to demonstrate the connections for device functions. Battery
charger operation is not guaranteed.
Charging status
Conditions
Charging mode
CHGN output1
LEDN output
Internal timer
INH
Battery
check OK
Quick charge
LOW
Yes
Quick charge
High impedance
LOW (ON)
Count
Quick charge hold
LOW
No
Pulse trickle
13.68Hz, 3.91% duty
1Hz (pulsing)
Count
Quick charge inhibit
HIGH
Pulse trickle
13.68Hz, 3.91% duty
Same condition as
when INH went HIGH
Hold
Supplemental charge
LOW
OK
Supplemental
218Hz, 6.25% duty
High impedance (OFF)
Count
Supplemental charge inhibit
HIGH
OK
Pulse trickle
13.68Hz, 3.91% duty
High impedance (OFF)
Hold
Pulse trickle
Pulse trickle
13.68Hz, 3.91% duty
High impedance (OFF)
Standby
High impedance
High impedance (OFF)
Reset
1. Frequency and duty are typical values.
TEMP
BATT
CHGN
VSS
LEDN
INH
VDD
TIME
VDD 5V
6
2
1
4
8
7
5
3
R6
33k
R7
100k
Q3
2SC945
SW2
IN
VSS
OUT
78L05
5V
VBEQ2
Q2
2SD525
R2
4/5W
ICHG
Q1
2SC945
R1
5.1k
External current source
R8
100k
R9
200k
R10
200k
R13
14k
R12
12k
SM6780AS
R5
1.8k
R3
100k
R4
100k
SW1
VBB 12V
R11
640
ICHG =
5
− VBEQ2
R2
=
5
− 0.65
4
= N
− 1
R9
R10
N= Number of cells
NTC
R:10k
(at 25 C)
B:3435K


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