MC33340EVK Просмотр технического описания (PDF) - ON Semiconductor
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MC33340EVK Datasheet PDF : 12 Pages
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MC33340 MC33342
Figure 12. Timer Functional Block Diagram
11 ms Preset
Q
DQ
22 ms Convert
Oscillator
760 kHz
Switch 2
211
÷23
÷26
÷22
95 kHz
SCK to
Voltage to
Frequency
Converter
Switch 3A
Test Normal
25
÷23
÷21
÷25
÷28
÷22
Switch 3B
211
Switch 1
219
MC33340
Holdoff Time Signal MC33342
Each test mode bypass switch is shown
in the proper position for normal charger operation.
t1/TrefHigh
t2/Tsen
t3/TrefLow
÷2 ÷2 ÷2 ÷2
Time and Test Decoder
Fast/Trickle Output
Figure 13. Line Isolated Linear Regulator Charger
C2
R5
1.0 k D3
IC1 MC33340 or MC33342 VCC 8
0.1
Undervoltage
Lockout
AC
1N4002
Internal Bias
VCC
Line
Input
D2 R2 Vsen
Voltage to
Frequency
2.9 V
RNTC
10 k
LM317
1
Converter
Over
IC2
R1
Temp
DC
Input
IAdj
R7
2.4
R8
220
C1
0.01
Ck F/V R R Latch
2.0 V
1.0 V
High
Battery
Detect
Low
Over
Under
QS
Temp
Detect
Battery
Pack
R6
1.8 k
D4
D1
Charge
Status
ǒ Ǔ + R2
R1
VBatt
Vsen
–
1
+ ) Ichg(fast)
Vref (IAdj R8)
R7
Vsen
Gate
2
3
Fast/
Trickle
t1
–∆V Detect
Counter
Timer t2
Vsen
Gate
t3
F/T
t/T
Time/Temp
Select
30 µA t1/Tref High
7
SW1 R3
30 µA t2/Tsen
6
SW2
30 µA t3/Tref Low
5
VCC
SW3 R4
0.6 V
+ Ichg(trickle)
Vin – Vf(D3) – VBatt
R5
Gnd 4
This application combines the MC33340/342 with an adjustable three terminal regulator to form an isolated secondary side battery charger. Regulator IC2 operates
as a constant current source with R7 setting the fast charge level. The trickle charge level is set by R5. The R2/R1 divider should be adjusted so that the Vsen input
is less than 2.0 V when the batteries are fully charged. The printed circuit board shown below will accept the several TO–220 style heatsinks for IC2 and are all
manufactured by AAVID Engineering Inc.
MOTOROLA ANALOG IC DEVICE DATA
9
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