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PDF SY5830 Data sheet ( Hoja de datos )
| Número de pieza | SY5830 | |
| Descripción | Single Stage Flyback And PFC Controller | |
| Fabricantes | Silergy | |
| Logotipo |  |
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Applications Note: SY5830
Single Stage Flyback And PFC Controller
With Primary Side Control For LED Lighting
Preliminary datasheet
General Description
The SY5830 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. It
adopts special design to achieve quick start up and
reliable protection for safety requirement.
Ordering Information
SY5830 □(□□)□
Tempera ture Code
Packa ge Code
Optional Spec Code
Ordering Number
SY5830ABC
Package type
SOT23-6
Note
----
Features
• Primary side control eliminates the opto-coupler.
• Valley turn-on of the primary MOSFET to achieve
low switching losses
• Power factor >0.90 with single-stage conversion.
• Reliable short LED and Open LED protection
• Quick start up <500ms
• Low start up current:15µA typical
• Package: SOT23-6
Applications
• LED lighting
Typical Applications
AC input
DB1
C1
R9 C3 NP
C2 R1
D2
NS R10
Output
C4
NAUX
R2 D3
C5
D1
R3
R6
ISEN DRV
GND VIN
R4
COMP VSEN
R7
R5 SY5830
C6
Q1
R8
CY1
R11
Figure 1. Schematic Diagram SOT23-6
Figure 2. Efficiency vs Input Voltage
AN_SY5830 Rev.0.1
Silergy Corp. Confidential- Prepared for Customer Use Only 1
1 page  
Operation
SY5830 is a constant current Flyback controller with
primary side control and PFC function that targets at
LED lighting applications.
The device provides primary side control to eliminate
the opto-couplers or the secondary feedback circuits,
which would cut down the cost of the system.
High power factor is achieved by constant on
operation mode, with which the control scheme and
the circuit structure are both simple.
Start up process is optimized inside SY5830, and
quick start up (less than 500ms) is achieved without
any additional circuit
In order to reduce the switching losses and improve
EMI performance, Quasi-Resonant switching mode is
applied, which means to turn on the power MOSFET
at voltage valley; the start up current of SY5830 is
rather small (15µA typically) to reduce the standby
power loss further; the maximum switching
frequency is clamped to 125kHz to reduce switching
losses and improve EMI performance when the
converter is operated at light load condition.
SY5830 provides reliable protections such as Short
Circuit Protection (SCP), Open LED Protection
(OLP), Over Temperature Protection (OTP),
transformer shorted protection and power diode
shorted protection, etc.
.
SY5830 is available with SOT23-6
Applications Information
Start up
After AC supply or DC BUS is powered on, the
capacitor CVIN across VIN and GND pin is charged
up by BUS voltage through a start up resistor RST.
Once VVIN rises up to VVIN-ON, the internal blocks
start to work and PWM output is enabled.
The output voltage is feedback by VSEN pin, which
is taken as VFB. If VFBV is lower than certain
threshold VVSEN,ST, which means the output voltage is
not built up, VCOMP is pulled up to high clamped; if
SY5830
VFBV is higher than VVSEN,ST, VCOMP is under charge
of the internal gain modulator.
VVIN
VVIN,ON
VVIN,OFF
High
clamped
VCOMP,IC
PWM
VCOMP,INT
VCOMP
t
t
VFBV
VFB,ST
t
t
Fig. Start up
This operation is aimed to build up enough output
voltage for auxiliary winding bias supply as quickly
as possible. It is enabled only one time just when
VVIN is over VVIN,ON.
VCOMP is pre-charged by internal current source to
VCOMP,IC and hold at this level until fast start up
process is finished.
The start up resistor RST and CVIN are designed by
rules below:
(a) Preset start-up resistor RST, make sure that the
current through RST is larger than IST and smaller than
IVIN_OVP
VBUS
IVIN_OVP
<R ST
<
VBUS
IST
Where VBUS is the BUS line voltage.
AN_SY5830Rev.0.1 Silergy Corp. Confidential- Prepared for Customer Use Only 5
5 Page 
Layout
(a) To achieve better EMI performance and reduce
line frequency ripples, the output of the bridge
rectifier should be connected to the BUS line
capacitor first, then to the switching circuit.
(b) The circuit loop of all switching circuit should be
kept small: primary power loop, secondary loop and
auxiliary power loop.
(c) The connection of primary ground is
recommended as:
SY5830
Ground ①: ground of BUS line capacitor
Ground ②: ground of bias supply capacitor
Ground ③: ground node of auxiliary winding
Ground ④: ground of signal trace
Ground ⑤: primary ground node of Y capacitor
Ground ⑥: ground node of current sample resistor.
(d) bias supply trace should be connected to the bias
supply capacitor first instead of GND pin. The bias
supply capacitor should be put beside the IC.
(e) Loop of ‘Source pin – current sample resistor –
GND pin’ should be kept as small as possible.
(f) The resistor divider connected to VSEN pin is
recommended to be put beside the IC.
Fig. Ground connection recommended
AN_SY5830Rev.0.1 Silergy Corp. Confidential- Prepared for Customer Use Only 11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet SY5830.PDF ] | |
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