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After Sales Technical Documentation
Cigarette Lighter Charger
LCH–2
Original 50/96
NMP Part No. 0275271
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After Sales
Cigarette Lighter Charger LCH–2
CONTENTS
Cigarette Lighter Charger LCH–2 – 3. . . . . . . . . . . . . . . . . . . . . . . . .
Related Documentation – 3. . . . . . . . . . . . . . . . . . . . . . . . . . .
General – 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Technical Summary – 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
States of Charge and Charge Control – 3. . . . . . . . . . . . . . . . .
Charge Indication – 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical Specifications – 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Functional Description – 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General – 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Converter – 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Oscillator – 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pulse–Width Control – 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Current Limiting – 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Block Diagram of AL4 – 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Circuit Diagram of AL4 – 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Layout and Foil Diagrams of AL4 – 8. . . . . . . . . . . . . . . . . . . . . . .
Parts List of AL4A (Issue 1.1) Code: 0200044 – 9. . . . . . . . . .
Exploded View – 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Assembly Parts – 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Technical Documentation
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Original 50/96
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After Sales
Technical Documentation
Cigarette Lighter Charger LCH–2
Cigarette Lighter Charger LCH–2
Related Documentation
4A 0200044 block diagram AL4
3B 0200044 circuit diagram AL4
4F 9853826 layout and foil diagrams
6E 0200044 parts list AL4
S 0675005 exploded view
6E 0260062 assembly parts LCH–2
6E 0260094 assembly parts LCH–2U
General
The LCH–2 cigarette lighter charger is used for charging the battery of
the handportable phone from the 12 or 24 V cigarette lighter socket of a
motor vehicle. The charger is provided with LED charging indication.
Technical Summary
States of Charge and Charge Control
The LCH–2 cigarette lighter charger is used for charging a handportable
phone from a car battery. A constant–current or constant–voltage output
is provided depending on the operating state of the phone.
Charge current is supplied through a series switch transistor located in
the phone. When the transistor is on the charger supplies a constant current to the phone. The phone is then in the rapid charge mode.
When the transistor is off no current is supplied to the phone and the
charger is in the constant–voltage mode.
Once fully charged in the rapid charge mode, the battery is kept full by
means of pulsed charging. Current is switched on and off at a variable
duty cycle and a frequency of a few Hz.
Charge Indication
Charger states are indicated with a dual–colour LED located in the cigarette lighter charger unit.
In addition, the phone LCD contains a three–bar battery status display,
operative when power for the phone is on.
”Charging sequence active” (state A) is indicated by the bars being lit sequentially, starting from the bottom one.
”Battery full” (state B) is indicated by all three bars steadily lit.
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Cigarette Lighter Charger LCH–2
Phone operating status LED Display
Cigarette lighter charger connected
to vehicle, phone disconnected green
Phone connected to charger, charging
disabled due to battery temperature green state A
Rapid charge red state A
Battery full –> trickle charge green state B
Calling state green/ state A
*) Battery capacity is maintained during a phone call by occasional rapid
charge
cycles. Consequently, the LED can be indicating either red or green.
Electrical Specifications
Technical Documentation
*)
red
Operating input voltage: 9 to 32 V d.c.
Input current without phone: < 60 mA
Max. input current: 1.8 A
Output voltage:
• constant voltage 12.5 ±1 V/0...400 mA
• constant current 800 ±70 mA/5.0...10 V
Functional Description
General
The charger module consists of a switched–mode converter and a bi–
colour indicator LED. The converter is of the step up/down type, i.e. the
output voltage can be lower or higher than the input voltage.
Converter
Converter input current is received via filter capacitor C101. The converter consists of coils L110, L112, FET switch V112, d.c. level shifting capacitor C111 and Schottky diode V113. Output energy is stored and filtered
by C112, L111 and C113.
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In series with converter coil L112 is resistor R116, used for measuring the
output current. When operating, the converter generates a negative voltage drop (as compared to ground level) at R116, directly proportional to
output current.
Converter control is by N110, a quad comparator with open–collector output. The 5 V reference supply is generated by regulator N100.
Original 50/96
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Technical Documentation
Oscillator
The converter operates at a fixed frequency of 300 kHz, produced by oscillator N110A. A suitable operating voltage for the comparator positive
input is set by resistor divider R112/R114. Positive feedback from the
comparator output is supplied by R111 in parallel with C104. When the
comparator output is high C110 is charged through R110 and R113 until
the voltage at the negative input exceeds the positive input. At that instant
the comparator output turns low and C110 is discharged via R113.
Pulse–Width Control
Pulse width is controlled by comparator N110B, where the saw–tooth voltage from the oscillator is compared to a d.c. control voltage. Max. control
voltage is set by resistor divider R121/R120 to make sure that pulse width
cannot reach 100 % under any conditions as this would mean short–circuiting VB to GND via V112.
Cigarette Lighter Charger LCH–2
When the control voltage drops, so do the pulse width and the converter
output current. The control voltage can be pulled down by output current
comparator N110C, output voltage comparator N110D, or by the ”error”
output pin of a reference regulator N100.
Current Limiting
Output current is measured with series resistor R116 connected between
L112 and GND. When the converter operates with the output loaded it
generates a negative voltage drop (as compared to GND) over this resistor.
The voltage drop is added to the positive reference value set by R122
and R123 and used as the current comparator positive input. The current
comparator compares the level of this input to zero (ground) level. When
the current reaches the limit, voltage at the positive input falls to zero and
the comparator output goes down, limiting the duty cycle. The value of the
current limit is set by resistor divider R122, R123. A negative feedback for
stabilize the comparator is produced with R124.
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Cigarette Lighter Charger LCH–2
Block Diagram of AL4
Technical Documentation
R
GND GND
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Original 50/96
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After Sales
Technical Documentation
Circuit Diagram of AL4
Cigarette Lighter Charger LCH–2
Original 50/96
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After Sales
Cigarette Lighter Charger LCH–2
Layout and Foil Diagrams of AL4
Technical Documentation
Page – 8
Original 50/96
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Technical Documentation
Cigarette Lighter Charger LCH–2
Parts List of AL4A (Issue 1.1) Code: 0200044
ITEM CODE DESCRIPTION VALUE TYPE
R100 1412536 Chip resistor 22 k 5 % 0.1 W 0805
R110 1414406 Chip resistor 5.6 k 5 % 0.1 W 0805
R111 1413603 Chip resistor 47 k 5 % 0.1 W 0805
R112 1412536 Chip resistor 22 k 5 % 0.1 W 0805
R113 1412536 Chip resistor 22 k 5 % 0.1 W 0805
R114 1413603 Chip resistor 47 k 5 % 0.1 W 0805
R115 1414406 Chip resistor 5.6 k 5 % 0.1 W 0805
R116 1400844 Melf resistor 0.33 2 % 0.7 W 6.5x2.5
R118 1413909 Chip resistor 68 5 % 0.1 W 0805
R120 1412511 Chip resistor 18 k 5 % 0.1 W 0805
R121 1414438 Chip resistor 8.2 k 1 % 0.1 W 0805
R122 1414318 Chip resistor 150 k 1 % 0.1 W 0805
R123 1414438 Chip resistor 8.2 k 1 % 0.1 W 0805
R124 1412536 Chip resistor 22 k 5 % 0.1 W 0805
R130 1414477 Chip resistor 12 k 1 % 0.1 W 0805
R131 1413723 Chip resistor 470 k 5 % 0.1 W 0805
R132 1412536 Chip resistor 22 k 5 % 0.1 W 0805
R133 1414438 Chip resistor 8.2 k 1 % 0.1 W 0805
R134 1413723 Chip resistor 470 k 5 % 0.1 W 0805
R135 1414029 Chip resistor 3.3 k 5 % 0.1 W 0805
R136 1414043 Chip resistor 1.8 k 5 % 0.1 W 0805
R137 1413829 Chip resistor 10 5 % 0.1 W 0805
C100 2310777 Ceramic cap. 22 n 20 % 50 V 0805
C101 2501605 Electrol. cap. 100 u 20 % 35 V RM3.5
C102 2604209 Tantalum cap. 1.0 u 20 % 16 V 3.2x1.6x1.6
C103 2604209 Tantalum cap. 1.0 u 20 % 16 V 3.2x1.6x1.6
C104 2310424 Ceramic cap. 100 p 5 % 50 V 0805
C105 2310777 Ceramic cap. 22 n 20 % 50 V 0805
C106 2505239 Electrol. cap. 10 u 20 % 35 V 5X11
C110 2310488 Ceramic cap. 330 p 5 % 50 V 0805
C111 2404094 Polyester cap. 470 n 10 % 63 V RM5
C112 2404094 Polyester cap. 470 n 10 % 63 V RM5
C113 2502736 Electrol. cap. 220 u 20 % 16 V 3.5MM
C114 2310777 Ceramic cap. 22 n 20 % 50 V 0805
C120 2604209 Tantalum cap. 1.0 u 20 % 16 V 3.2x1.6x1.6
C121 2310738 Ceramic cap. 4.7 n 20 % 50 V 0805
C122 2310738 Ceramic cap. 4.7 n 20 % 50 V 0805
C130 2610024 Tantalum cap. 2.2 u 20 % 16 V 3.2x1.6x1.6
C131 2310777 Ceramic cap. 22 n 20 % 50 V 0805
L100 3600007 Coil 1.4 A RM5
L110 3607555 Coil 125 u 2 A d17x12mm
L111 3606698 Choke 60 u MAX.
L112 3607555 Coil 125 u 2 A d17x12mm
Original 50/96
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Cigarette Lighter Charger LCH–2
V100 4103529 Trans. supr. 31.4/35V d5.3x9.5
V101 4200836 Transistor BCX19 npn 50 V 0.5 A SOT23
V102 4107160 Zener diode BZX84 5 % 12 V 0.3 W SOT23
V103 4108639 Diode x 2 BAS28 75 V 250 mA SOT143
V110 4200917 Transistor BC848B/BCW32 npn 30 V 100 mA SOT23
V111 4200909 Transistor BC858B/BCW30 pnp 30 V 100 mA SOT23
V112 4200868 MosFet IRF530 n–ch 10 V 14 A TO220
V113 4100221 Schottky diode 21DQ06 60 V 1.7 A d3.7x7mm
V130 4108639 Diode x 2 BAS28 75 V 250 mA SOT143
V131 4200909 Transistor BC858B/BCW30 pnp 30 V 100 mA SOT23
V132 4200909 Transistor BC858B/BCW30 pnp 30 V 100 mA SOT23
V133 4108639 Diode x 2 BAS28 75 V 250 mA SOT143
V134 4102974 Led Green/Red 2.1 V 2x5mm
V135 4200917 Transistor BC848B/BCW32 npn 30 V 100 mA SOT23
N100 4301062 IC, regulator LP2951AC SO8S
N110 4305733 IC, 4 x comp LM2901 SO14S
X100 5448916 Pin header 1x02 2.54mm
3200047 Ferrite ring d 3.5x1.3x4.3mm f2
6430105 Plast.rivet 2.0x3.0 socket 6.4
7113204 Wire stran 0.15mm2 blk
7113243 Wire stran 0.15mm2 red
7510302 Adhesive stick jet–melt tc–3748
9500006 Connector spring 4D21391 LCH–2
9853826 PCB AL4A 44X37X1.6 D 8/PA LHC–2
9853826 PC board AL4A 44x37x1.6 d 8/pa lhc–2
Technical Documentation
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Technical Documentation
Exploded View
Cigarette Lighter Charger LCH–2
Assembly Parts
ITEM Q’TY CODE DESCRIPTION VALUE, TYPE
1 9450050 Cover 1D 21289
2 9450051 Bottom 1D 21288
3 9450052 Head–screw 3D 21287
4 9500005 Head–pin 4D 21390
5 6400056 Connector spring 4D 21391
6 3 6154430 PT–screw 25 x 8 WN–1442
7 9370095 Type label 4D 21487
8 7100408 Spiral cable 3D 21247
9 5112050 Fuse 3.15 A/250 V 6.3 x 32 mm
C1 0200044 AL4 module
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Technical Documentation
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