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Old 02-05-2011, 07:41 AM   #1
Richie_ady
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Default Memahami & Mengatasi Masalah Pengisian jelek pada ponsel China

Pada ponsel China sering kita menemukan masalah dicharge jalan sebentar kemudian berhenti & muncul pengisian jelek. Biasanya ini diakibatkan oleh IC Power yg bermasalah atau MOSFET Transistor (IC Charging) yg jelek, setelah diyakinkan batt & charger dalam kondisi baik.

Memahami system kerja Charging pd ponsel china adalah sbg berikut:
Diambil contoh adalah dgn IC Power MT6318, CPU MTK6225/6/7



U400 adalah PMIC (Power Management IC) = IC Power
U401 adalah IC Charging (Didalamnya berisi Rangkaian Transitor PNP & 1 Dioda Zener)


Perhatikan ke 8 kaki Transitor U401 tsb :

Kaki 1 & 2 : Adalah Kaki A = Anoda Internal Transistor didalam U401
Kaki 3 : Adalah kaki S = Signal masuk berupa VCharger, ditangkap oleh Collector Transistor PNP Internal
Kaki 4 : Adalah Kaki G = Gate Driver Analog Voltage dari PMIC, ditangkap oleh Basis Transistor PNP Internal dlm IC Charging tsb.
Kaki 5 & 6 : Adalah kaki D = Diode. Adalah keluaran dari kaki Emitor Transistor PNP Internal dlm IC, yg akan menuju kaki Dioda kutub Anoda.
Kaki 7 : terhubung ke VBatt juga ke PMIC sbg Sensor Arus Charging
Kaki 8 : terhubung ke R417 yg menuju Batt. (Output IC Charging U401 ini)


System kerja Charging Transistor :

1. VCharger 5V (USB) masuk ke kaki 3 (Kaki S= Signal/Collector MOSFETT Internal)
2. Kaki 1 kondisi standby, menunggu Enable pd Kaki 4 (Kaki G = Kaki Gate Driver/Gerbang Basis MOSFETT, yg dtg dr Power IC kaki E2 (GDRVAC = Gate Drive Voltage Analog Charger)
3. Setelah Enable 2,4V dari IC Power keluar, karena PMIC juga mendapat VChg di kaki E1.
4. Maka MOSFETT Internal mengeluarkan teg. Charger 4V ke kaki 5&6 (Emitor MOSFETT PNP = Kaki D/Diode)
5. Selanjutnya kaki 5&6 terhubung langsung ke 1&2 (Kaki Anoda Dioda Zener Internal) Gunanya utk disearahkan teg. yg td diturunkan.
6. Selanjutnya teg. tersebut melewati Dioda Zener dlm IC Charging tsb. Tujuannya menyearahkan arus dan menuju kaki 7&8 yg terhubung ke Batt. (Kaki C = Cathode)
7. Melewati Resistor R417 dahulu sbg Current Sensor (R berhambatan kecil) barulah menuju Battere.
8. Kaki 7 td masuk ke PMIC sbg Sensor arus pengisian yg dideteksi oleh PMIC, apabila bermasalah maka muncul pengisian jelek.

Solusinya :

Ukur teg. & arus ISENSE ini dimulai saat charger dicolok. apabila saat muncul pengisian jelek, arus ngedrop, pertanda IC Charging bermasalah, namun apabila stabil, pertanda PMIC yg bermasalah, juga perhatikan Capasitor2 bermasalah pd jalur tsb (Leakage Capasitor)
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The Following 7 Users Say Thank You to Richie_ady For This Useful Post:
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Old 02-05-2011, 03:11 PM   #2
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Default Re: Memahami & Mengatasi Masalah Pengisian jelek pada ponsel China

Nice.. Keep share Om..
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Old 02-05-2011, 04:17 PM   #3
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Thumbs up Re: Memahami & Mengatasi Masalah Pengisian jelek pada ponsel China

Thanks ............................
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Old 03-28-2011, 04:42 PM   #4
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Default Re: Memahami & Mengatasi Masalah Pengisian jelek pada ponsel China

thanks info nya gan.......
moga sukses slalu...........
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Old 03-28-2011, 06:47 PM   #5
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Default Re: Memahami & Mengatasi Masalah Pengisian jelek pada ponsel China

mantab...........................
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Old 03-29-2011, 01:58 PM   #6
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Default Re: Memahami & Mengatasi Masalah Pengisian jelek pada ponsel China

pengaru juga dari carger yg bellebih teg outnya..kadang ada yg 6-9volt lebih.ini juga sangt berpengaruh.
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Old 04-01-2011, 12:55 AM   #7
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Thumbs up Re: Memahami & Mengatasi Masalah Pengisian jelek pada ponsel China

ikut nambah pengetahuan neh om.....good job....
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