flip9
Well-Known Member
- Joined
- May 17, 2015
- Messages
- 453
- Reaction score
- 429
- Country
- Australia
- Dash Cam
- F770, SG9665GC
I wanted to check out my unused power supply that came with the cam so i opened it up.
The plastic case is either glued or ultrasonically welded but a little nudge from a vice loosened it up. Once its opened up you'll see two big capacitors and an inductor. If you turn it around you will see the 8pin regulator and supporting components. I searched the datasheet for the regulator chip and its rated for 24v 2Amps with operating temps of -40 to +85c.
It looks like a good power supply thats well filtered. The 5v output has at least 3 capacitors and ferrite beads (FB) on top of the reference design. The 12v input has 2 capacitors and a bead. (Different sized capacitors filter out different frequencies)
Feedback Pin has a resistor divider (R1 - 47.5k , R2 - 10k) which sets the Output voltage to 5.31v. It will be closer to 5.2v after the voltage drop from the 3m cable length.
Things of note:
-The wires of the USB cable is coloured incorrectly (but pinned correctly)
-I was expecting a diode on the input but a zero ohm link was used instead, possibly as a fusible resistor.
-Component number labels wont match ref schematic (board is used for other applications)
-Cig plug has a 3AG fuse rated at 1A
Ive obscured the chip and board info. The Red line is the output side after the inductor.
The plastic case is either glued or ultrasonically welded but a little nudge from a vice loosened it up. Once its opened up you'll see two big capacitors and an inductor. If you turn it around you will see the 8pin regulator and supporting components. I searched the datasheet for the regulator chip and its rated for 24v 2Amps with operating temps of -40 to +85c.
It looks like a good power supply thats well filtered. The 5v output has at least 3 capacitors and ferrite beads (FB) on top of the reference design. The 12v input has 2 capacitors and a bead. (Different sized capacitors filter out different frequencies)
Feedback Pin has a resistor divider (R1 - 47.5k , R2 - 10k) which sets the Output voltage to 5.31v. It will be closer to 5.2v after the voltage drop from the 3m cable length.
Things of note:
-The wires of the USB cable is coloured incorrectly (but pinned correctly)
-I was expecting a diode on the input but a zero ohm link was used instead, possibly as a fusible resistor.
-Component number labels wont match ref schematic (board is used for other applications)
-Cig plug has a 3AG fuse rated at 1A
Ive obscured the chip and board info. The Red line is the output side after the inductor.
![8Fq7J63.jpg](/forum/proxy.php?image=http%3A%2F%2Fi.imgur.com%2F8Fq7J63.jpg&hash=3ced6050e38a6fc87c974c0d4a081c61)
Last edited: