PSU
Schematics. PD46A0_BSM (BN44-00422A) PD46A1_BSM (BN44-00423A), BN44-00458A
Models: Samsung UN46D6003SFXZC, Samsung UN40D6000SFXZA, Samsung UN40D5500RF
Using:
SEM5025(SMPS control IC), FSFR-1700XSL, TK8A50D(FET), D2011K
PD46A0
BSM (BN44-00422A)
PD46A1
BSM (BN44-00423A)
The
output to excite the LEDs behaves like a current source of 300mA approx.
It
means that the current tries to be constant and it is the output voltage that
varies. This can down even to 118V.
When
there is not enough loads in the exit, the source of LEDs has hiccups. (From
800 ohm approx.)
The
hiccup manifests like this: the Drive LED + se activate and rises to 322V
(completely without load).
At
that time the whole source is turned off, with a voltage high (3V approx.) by
pin 9, which immediately returns at 0.1V. Notwithstanding the source Drive LED + delay seconds to restart. The sample of OVP (Over Voltage Protection) comes to the integrated by leg
12. But if it registers short, it is
completely inhibited, both Drive LED +, as Drive LED - (0V in both outputs), and
as soon as the short disappears, the source restarts.
When
registering short, pin 6 goes up to 11.2V. The 14 goes down to 2V. The maximum current is around 0.33A, when the
exit of Drive LED+ is so minimal, that it only exceeds by 3V to the input
source.
100-240V 50 / 60HZ 2.5A
A5V
5.3V / 100mA
B5V
46A0 5.3V / 2.9A
B5V
46A1 5.3V / 3.5A
B13V
46A0 12.8V / 1.49A
B13V
46A1 12.8V / 3.17A
VAMP
12.8V / 0.29A
Led
Driver (TOP1 +) 255V / 308MA)
Model N46A0 PSLF121A03A, 46A1 PSLF151A03A
If
the voltage at pin 13 drops to 0V, the source Drive LED + is suspended. If the
116V exist, the LEDs they lower the brightness but they do not extinguish.
That
means the Drive LED- is still active Without RL it delivers fluctuating 315. Drive LED + works, but
Drive LED- is suspended.
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