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MP4030A Schematic ( PDF Datasheet ) - MPS

Teilenummer MP4030A
Beschreibung Primary-Side-Control Offline LED Controller
Hersteller MPS
Logo MPS Logo 




Gesamt 20 Seiten
MP4030A Datasheet, Funktion
The Future of Analog IC Technology
MP4030A
TRIAC-Dimmable, Primary-Side-Control
Offline LED Controller with Active PFC
DESCRIPTION
The MP4030A is a TRIAC-dimmable, primary-
side-control, offline LED lighting controller with
active PFC. It can output an accurate LED
current for an isolated lighting application with a
single-stage converter. The proprietary real-
current-control method can accurately control the
LED current using primary-side information. It
can significantly simplify LED lighting system
design by eliminating secondary-side feedback
components and the optocoupler.
The MP4030A implements power-factor
correction and works in boundary-conduction
mode to reduce MOSFET switching losses.
The MP4030A has an integrated charging circuit
at the supply pin for fast start-up without a
perceptible delay.
The proprietary dimming control expands the
TRIAC-based dimming range.
The MP4030A features multiple protections
including over-voltage protection (OVP), short-
circuit protection (SCP), primary-side over-
current protection (OCP), supply-pin under-
voltage lockout (UVLO), and over temperature
protection (OTP). All of which not only simplifies
circuit design but also enhances system reliability
and safety greatly. All fault protections feature
auto-restart.
The MP4030A is available in an 8-pin SOIC
package.
FEATURES
Primary-Side-Control without Requiring a
Secondary-Side Feedback Circuit
Internal Charging Circuit at the Supply Pin for
Fast Start-Up
Accurate Line & Load Regulation
High Power Factor and Improved THD
Flicker-Free, Phase-Controlled TRIAC
Dimming with Expanded Dimming Range 1%
to 100% Full Range
Operates in Boundary Conduction Mode
Cycle-by-Cycle Current Limit
Primary-Side, Over-Current Protection
Over-Voltage Protection
Short-Circuit Protection
Over-Temperature Protection
Available in an 8-Pin SOIC Package
APPLICATIONS
Solid-State Lighting, including:
Industrial and Commercial Lighting
Residential Lighting
All MPS parts are lead-free and adhere to the RoHS directive. For MPS green
status, please visit MPS website under Products, Quality Assurance page.
“MPS” and “The Future of Analog IC Technology” are registered trademarks of
Monolithic Power Systems, Inc.
MP4030A Rev.1.01
www.MonolithicPower.com
9/27/2013
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
1






MP4030A Datasheet, Funktion
MP4030A—PRIMARY-SIDE-CONTROL, OFFLINE, LED CONTROLLER WITH PFC
PIN FUNCTIONS
Pin #
1
2
3
4
5
6
7
8
Name
MULT
ZCD
VCC
DP
S
D
GND
COMP
Pin Function
Internal Multiplier Input. Connect to the tap of resistor divider from the rectified voltage of
the AC line. The half-wave sinusoidal signal provides a reference signal for the internal
current-control loop. MULT also detects the TRIAC-dimming phase.
Zero-Current Detection. A negative going-edge triggers the internal MOSFET’s turn-on
signal. Connect to the tap of a resistor divider from the auxiliary winding to GND. The ZCD
pin can also detect over-voltage. Over-voltage occurs if VZCD exceeds the OVP threshold
after a 1.85µs blanking time when the internal MOSFET turns off.
Supply Voltage. Supplies power for both the control signal and the internal MOSFET’s gate
driver. Connect to an external bulk capacitor - typically 22µF with a 100pF ceramic capacitor
to reduce noise.
Dimming Pull-Down. Drain of the internal dimming pull-down MOSFET. Connect a resistor
from this pin to the D pin to pull down the rectified input voltage during the TRIAC dimming
OFF interval.
Internal Low-Side Main MOSFET Source. Connect a resistor from this pin to GND to sense
the internal MOSFET current. An internal comparator compares the resulting voltage to the
internal sinusoid shaped current reference signal to determine when the MOSFET turns off.
If the voltage exceeds the current-limit threshold of 2.3V after the leading edge blanking
time during the turn-on interval, the gate signal turns off. Over-current occurs if Vs exceeds
2.73V during the turn-on interval after the leading-edge blanking time for OCP.
Internal Low-Side Main MOSFET Drain. Internally connects to VCC via a diode and a JFET
to form an internal charging circuit for VCC. Connect to the source of the high-side MOSFET.
An internal MOSFET pulls up the D to VCC through a diode at fault condition to turn off the
main switch.
Ground. Current return of the control signal and the gate drive signal.
Loop Compensation. Connects to a compensation network to stabilize the LED driver and
accurately control the LED driver current.
MP4030A Rev.1.01
www.MonolithicPower.com
9/27/2013
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
6

6 Page









MP4030A pdf, datenblatt
MP4030A—PRIMARY-SIDE-CONTROL, OFFLINE, LED CONTROLLER WITH PFC
Multiplier Output
Inductor Current
Vcc Auxiliary Winding Takes Charge
and Regulates the VCC
Fault Happens
10V
9V
7V
Internal
Charging Circuit
Figure 4: Power-Factor Correction
The multiplier’s maximum output voltage to the
current comparator is clamped at 2.3V to limit the
cycle-by-cycle current. The multiplier’s minimum
output voltage is clamped to 0.1V to ensure a
turn-on signal during the TRIAC dimming OFF
interval to pull down the rectifier input voltage for
accurate dimming-phase detection.
VCC Timing Sequence
Initially, VCC charges through the internal
charging circuit from the AC line. When VCC
reaches 10V, the internal charging circuit stops
charging, the control logic initializes and the
internal main MOSFET begins to switch. Then
the auxiliary winding takes over the power supply.
However, the initial auxiliary-winding positive
voltage may not be large enough to charge VCC,
causing VCC to drop. Instead, if VCC drops below
the 9V threshold, the internal charging circuit
triggers and charges VCC to 10V again. This cycle
repeats until the auxiliary winding voltage is high
enough to power VCC.
If any fault occurs during this time, the switching
and the internal charging circuit will stop and
latch, and VCC drops. When VCC decreases to 7V,
the internal charging circuit re-charges for auto-
restart.
Gate
Switching Pulses
Figure 5: VCC Timing Sequence
Auto-Start
The MP4030A includes an auto-starter that starts
timing when the MOSFET turns off. If ZCD fails
to send a turn-on signal after 115µs, the auto-
starter sends a turn-on signal to avoid
unnecessary IC shutdowns if ZCD fails.
Minimum OFF Time
The MP4030A operates with a variable switching
frequency and the frequency changes with the
instantaneous input-line voltage. To limit the
maximum frequency and for good EMI
performance, the MP4030A employs an internal
minimum OFF-time limiter of 5.1µs, as shown in
ZCD
GATE
Figure 6.
5.1µs
MP4030A Rev.1.01
www.MonolithicPower.com
9/27/2013
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
12

12 Page





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