Philips Delta Schematic

Subject: Power Supply DELTA date September 2011

Theo Heijnen
Consumer Care

Overview

Supplier: Delta

Article Id Description
2722 171 90337 MOD PSL 32 DPS-93BP A B
2722 171 90338 MOD PSL 42 DPS-139AP A B

2722 171 90339 MOD PSL 47 DPS-186FP A B

2722 171 90311 MOD PSU DPS-300AP-59 A B

8204 001 56651 MOD PSL DPS-318AP B

Remarks

Blockbuster - 32PFL66X6H/T/M/K /

Sundance - 42PFL74X6/H/T/M/K /

Infinity - 42/47PFL7XX6 / Infinity -

42PDL7906H/T/M/K

58PFL9955H/D & 9956H/T

46PFL9706H/T/M/K &

52PFL9606H/T/M/K

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2

Block Diagram

Protection for Output

@ OVP/OCP/Short/OPP

PS-on/off

Standby-3.3Vdc (0.2A)

AC input

Protection for BULK CAP

( LED Integrated Power Supply )

EMI Filter

OVP/output OPP

PFC

IC801

NCP1608

Main Power

IC901

ICE3BS03LJG

IC702

DDA009

LED Driver

Feedback

Sense Protection

for Line@ Open/

Short//OVP/UC

12Vdc (2A)

24Vdc5B(0.65A)

Main power Feedback

T wo light bar 118Vdc

BL_Dimming

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3

Output & Load condition

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4

Schematics_1/2

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5

Schematics_2/2

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6

EMI CIRCUIT

EMI stage

Key components for EMI solution: CX1& CX2 FL1 & FL2

V aristor Z1 is used to to protect against high-voltage transients and surges.

NTC1 is a negative temperature coefficient resistor in series with the line to limit the inrush
current when PSU first turn on.

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7

PFC CIRCUIT

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8

FLYBACK CIRCUIT_1/2

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9

FLYBACK CIRCUIT_2/2

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10

FLYBACK CIRCUIT_2/2

• Notes: IC902 is used to set the AC Brown In/ Out point and discharge
time. The trigger point is 1.28v f or Brown/I n and 1.16V for B rown out.

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11

DC_output F/B Circuit

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V

out_3.3V

V

out_12V

≒V

≒V

ref

ref

*(R

*(R

+R

917

958

912

+R

918

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+R

+R

913

913

)/R

)/R

913

913

+V

F_D922

12

TURN_ON CIRCUIT_1/2

C974 is the key
component

to set main power turn on
delay time, because Q918
will not be turned on till the
voltage of C974 is charged
to V

GS_TH

.

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13

Power saving circuit

Q911 will be off under standby mode, so that the power saving performance
would be better because there’s no power loss on R905A/B. R905A/B are used
to stabilize the output @ light load condition.

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14

LED DRIVER_1/3

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15

LED DRIVER_2/3

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16

LED Conn.

A1

A2

OCD

VLED: 55,8V (typ)
ILED: 240 mA (typ)

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17

LED DRIVER_3/3

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18

Notes

1. Visual inspection should be the first step you do once received a defect.
That’s to check components missing/ burnt or mechanical damage issues.

2. The second step is, check k ey components by using di gital multimeter.
Locations show as below:
F1/BD1/R945/Q901/Q701A/B……

3. If there’s no abnormal found, then we can power up the PSU to check
Standby output, enable STANDBY to check main output and BL-ON to
check LED

4. Check L800/T901/IC3 if no 3.3Vsb signal

5. If 12v/24v stays low after main power on, check Bulk voltage and IC901,
including voltage of VCC/FB, waveforms of Gate/CS pins.

6. As for LED stage, mostly the problem will be founded had relationship with
protection such as OC/OV/UC/Brown out, and it’s easy to be confirmed by
disabling the protection one by one.

7. Never forget that the PSU ( B ul k capacitor) must be discharged aft er power

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19

Timing sequence

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20

Fault finding circuit instruction_1/9

Fault finding circ uit inst ruc tion –
OVP function_PFC stage

Note:
An internal comparator connected to IC801 FB pin provides the OVP protection.
A resistor divider scales the output voltage to Vref to maintain regulation, IC801
Will be disabled when the pin voltage freater than Vovp. The OV P fea ture pr otects
the PFC stage against excessive output overshoots that may damage the system.

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21

Fault finding circuit instruction_2/9

Fault finding circ uit inst ruc tion –
OVP function_Flyback stage

Ovp section

Note:
The voltage from the auxiliary winding w ill be applied to IC901 pin 1 after a
time delay, there’s an internal Zero-Crossing detector us ed for s witch-on
determination. By comparing the voltage Vz c w ith an internal preset threshold
which is about 3.7V, the output over voltage detection is realized.

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22

Fault finding circuit instruction_3/9

Fault finding circ uit inst ruc tion –
OVP function_ LED driver

Note:
IC702 pin17 is the feedback for the voltage amplifier, connected to the output voltage
sense resistor divider(R786/787/788. This signal is compared to an internal 4V voltage
amplifier reference to limit output voltage in an over voltage condition or LED string

open condition

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.

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23

Fault finding circuit instruction_4/9

Fault finding circ uit inst ruc tion –
OCP function_PFC s ta ge

Note:
The CS pin limits the cycle-by-cycle current through the power switch. When
the CS voltage exceeds Vlim which is about 0.5V, the drive turns off. The R816
programs the peak current.

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24

Fault finding circuit instruction_5/9

Fault finding circ uit inst ruc tion –
OCP function_ FLYBACK stage

Note:
The CS pin limits the cycle-by-cycle current through the power switch.

When the CS voltage exceeds Vlim which is about 1V, the drive
turns off. The R903 programs the peak current.

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25

Fault finding circuit instruction_6/9

Fault finding circ uit inst ruc tion –
OCP function_ LED driver

Note:
Output Current sense Imput monitor s the LED current. As for the fee dback i nput

for the current amplifer, OC pin is connecte d to the trans former . This signal
is compared to the current reference by the current amplifier to regula te the
LED current, the regulation range is limited by the internal clamp (0.7V~2.8V)

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26

Fault finding circuit instruction_7/9

Fault finding circ uit inst ruc tion –
UC Protect function_ LE D driver

Note:
UC1/UC2 pin are used to monitor output current/voltage signal, w hen the UC1/UC2 voltage
is below the OVREF (two times V
source charges the UCDLY pin, when the UCDLY is above 4.5V a 20uA current source
charges the LATCH pin. And the controller will latch off when the LATCH voltage reaches

3V .

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OVPADJ

), a fault condition exists and a 2.5uA current

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27

Fault finding circuit instruction_8/9

Fault finding circuit instruction –
Brown IN/OUT_AC input

Note:
C963A/C963B/R934/IC902 are used to set Bro wn in/out poi nt. The PSU will be
Disabled if IC902 pin6<1.16V, and enabled if IC902 pin6>1.28V.

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28

Fault finding circuit instruction_9/9

Fault finding circuit instruction –
Brown OUT_LED driver

Note:
BRNO pin is used to detect low BULK voltage condition. The controller will be
disabled if BRNO>3V, and enabled if BRNO<2.5V.

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29

Connector information

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30

PSU Fault condition & Fall-off sumary

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31

PSU Fault condition & Fall-off

sumary

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