Applications Note: SY5800A
Single Stage Flyback And PFC Controller
With Primary Side Control For LED Lighting
Preliminary Specification
General Description
The SY5800A is a single stage Flyback and PFC
controller targeting at LED lighting applications. It is a
primary side controller without applying any secondary
feedback circuit for low cost, and drives the Flyback
converter in the quasi-resonant mode to achieve higher
efficiency. It keeps the Flyback converter in constant
on time operation to achieve high power factor.
Ordering Information
SY5800
□
(
□□
)
□
Temperature Code
Package Code
Optional Spec Code
Temperature Range:
-
40°C to 125°C
Ordering Number
Package type
SY5800AFBC
MSOP10
SY5800AFAC
SO8
•
Primary side control eliminates the opto-coupler.
•
Valley turn-on of the primary MOSFET to achieve
low switching losses
•
0.3V primary current sense reference voltage leads
to a lower sense resistance thus a lower conduction
loss.
•
Internal high current MOSFET driver: 1A sourcing
and 2A sinking
•
Low start up current: 15uA typical
•
Reliable short LED and Open LED protection
•
Power factor >0.90 with single-stage conversion.
•
Compact package: MSOP10 and SO8
Features
Applications
Note
----
----
•
•
•
•
•
LED lighting
Down light
Tube lamp
PAR lamp
Bulb
Typical Applications
Figure 1. Schematic Diagram MSOP10
AN_SY5800A Rev0.9
Silergy Corp. Confidential- Prepared for Customer Use Only
1
SY5800A
Figure 2. Schematic Diagram SO8
AN_SY8035 Rev. 0.9
Silergy Corp. Confidential- Prepared for Customer Use Only
2
SY5800A
Pinout
(
top view)
(MSOP10)
(SO8)
Top Mark: AFD
xyz
for SY5800AFBC(device
code: AFD,
x=year code, y=week code, z= lot number code
)
AFB
xyz
for SY5800AFAC(device
code: AFB,
x=year code, y=week code, z= lot number code
)
Pin Name
COMP
NC
Pin number
SO8
1
----
Pin number
MSOP10
1
2
Pin Description
Loop compensation pin. Connect a RC network across this pin and
ground to stabilize the control loop.
No connection.
Inductor current zero-crossing detection pin. This pin receives the
auxiliary winding voltage by a resister divider and detects the
inductor current zero crossing point. This pin also provides over
voltage protection and line regulation modification function
simultaneously. If the voltage on this pin is above 1.42V, the IC
would enter over voltage protection mode. Good line regulation
can be achieved by adjusting the upper resistor of the divider.
Current sense pin. Connect this pin to the source of the primary
switch. Connect the sense resistor across the source of the primary
switch and the GND pin.
V
×
N
PS
(current sense resister R
S
:
R
S
=k
REF
,
k
=
0.16 )
I
OUT
Ground pin
Gate driver pin. Connect this pin to the gate of primary MOSFET.
Power supply pin. This pin also provides output over voltage
protection along with ZCS pin.
Enable pin. Enable the IC by pulling the voltage on this pin above
1.5V and Shut down the IC by pulling the voltage on this pin
below 0.2V. If not used, connect this pin to VIN pin with a resistor
(470k is recommended).
Connected to ground.
Signal ground.
ZCS
2
3
ISEN
3
5
GND
DRV
VIN
4
5
6
4
6
7
EN
TM
SGND
7
8
----
8
9
10
AN_SY8035 Rev. 0.9
Silergy Corp. Confidential- Prepared for Customer Use Only
3
SY5800A
Absolute Maximum Ratings
(Note 1)
VIN, DRV ------------------------------------------------------------------------------------------------------------- -0.3V to 17V
EN, ZCS --------------------------------------------------------------------------------------------------------- -0.3V to V
IN
+0.3V
ISEN, COMP, TM -------------------------------------------------------------------------------------------------------------- 3.6V
Power Dissipation, @ T
A
= 25°C MSOP10/SO8 ------------------------------------------------------------------ 0.8W/1.1W
Package Thermal Resistance (Note 2)
MSOP10/SO8,
θ
JA -------------------------------------------------------------------------------------------- 125°C/W /88°C/W
MSOP10/SO8,
θ
JC --------------------------------------------------------------------------------------------- 60°C/W /45°C/W
Temperature Range ------------------------------------------------------------------------------------------------ 40°C to 150°C
Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------------------------ 260°C
Storage Temperature Range -------------------------------------------------------------------------------------- 65°C to 150°C
Recommended Operating Conditions
(Note 3)
VIN, DRV ----------------------------------------------------------------------------------------------------------------- 8V~15.4V
Junction Temperature Range ------------------------------------------------------------------------------------- -40°C to 125°C
Ambient Temperature Range --------------------------------------------------------------------------------------
-
40°C to 85°C
Block Diagram
Figure3. Block Diagram
AN_SY8035 Rev. 0.9
Silergy Corp. Confidential- Prepared for Customer Use Only
4
SY5800A
Electrical Characteristics
(V
IN
= 12V (Note 3), T
A
= 25°C unless otherwise specified)
Parameter
Power Supply Section
Input voltage range
VIN turn-on threshold
VIN turn-off threshold
VIN OVP voltage
Start up Current
Operating Current
Shunt current in OVP mode
Error Amplifier Section
Internal reference voltage
Current Sense Section
Current limit reference
voltage
ZCS pin Section
ZCS pin OVP voltage
threshold
Gate Driver Section
Gate driver voltage
Maximum source current
Minimum sink current
Max ON Time
Min ON Time
Max OFF Time
Min OFF Time
Maximum switching
frequency
Enable function Section
Enable ON
Enable OFF
Thermal Section
Thermal Shutdown
Temperature
Symbol
V
VIN
V
VIN,ON
V
VIN,OFF
V
VIN,OVP
I
ST
I
VIN
I
VIN,OVP
V
REF
V
ISEN,MAX
Test Conditions
Min
8
6.0
V
VIN
<V
VIN,OFF
C
L
=100pF,f=15kHz
V
VIN
>V
VIN,OVP
V
VIN_ON
+0.85
15
1
2
0.3
0.5
Typ
Max
15.4
17.6
7.9
Unit
V
V
V
V
A
mA
mA
V
V
1.6
0.294
2.5
0.306
V
ZCS,OVP
V
Gate
I
SOURCE
I
SINK
T
ON,MAX
T
ON,MIN
T
OFF,MAX
T
OFF,MIN
f
MAX
V
EN,ON
V
EN,OFF
T
SD
1.42
V
VIN
1
2
24
400
39
2
120
1.5
0.2
150
V
V
A
A
s
ns
s
s
kHz
V
V
°C
V
COMP
=1.5V
Note 1
: Stresses beyond the “Absolute Maximum Ratings” may cause permanent damage to the device. These are
stress ratings only. Functional operation of the device at these or any other conditions beyond those indicated in the
operational sections of the specification is not implied. Exposure to absolute maximum rating conditions for
extended periods may affect device reliability.
Note 2
:
ſ
JA
is measured in the natural convection at T
A
= 25°C on a low effective single layer thermal conductivity
test board of JEDEC 51-3 thermal measurement standard. Test condition: Device mounted on 2” x 2” FR-4 substrate
PCB, 2oz copper, with minimum recommended pad on top layer and thermal vias to bottom layer ground plane.
Note 3
: Increase VIN pin voltage gradually higher than V
VIN,ON
voltage then turn down to 12V.
AN_SY8035 Rev. 0.9
Silergy Corp. Confidential- Prepared for Customer Use Only
5
PCB设计
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