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PDF MP4026 Data sheet ( Hoja de datos )
| Número de pieza | MP4026 | |
| Descripción | Offline LED Controller | |
| Fabricantes | MPS | |
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MP4026
Primary-Side-Control,
Offline LED Controller with Active PFC
DESCRIPTION
The MP4026 is a primary-side-control, offline
LED controller that achieves high-power factor
and accurate LED current for isolated, single-
power-stage lighting applications in an FCTSOT
package. It is the next generation of the
successful MP4021A. The proprietary real-
current-control method accurately controls LED
current from primary-side information with good
line and load regulation. The primary-side-control
eliminates the secondary-side feedback
components and the opto-coupler to significantly
simplify LED-lighting-system design.
The MP4026 integrates power-factor correction
and works in boundary-conduction mode to
reduce MOSFET switching losses.
The MP4026’s multiple protection features
greatly enhance system reliability and safety.
These features include over-voltage protection,
short-circuit protection, primary-side over-current
protection, brown out protection, cycle-by-cycle
current limiting, VCC under-voltage lockout, and
auto-restart over-temperature protection.
FEATURES
Real-Current Control without Secondary-
Feedback Circuit
<2% Line/Load Regulation
High Power Factor (≥0.9) over Universal
Input Voltage
Boundary Conduction Mode for Improved
Efficiency
Brown-Out Protection
Over-Voltage Protection
Short-Circuit Protection
Over-Temperature Protection
Primary-Side Over-Current Protection
Cycle-by-Cycle Current Limit
Input UVLO
Available in FCTSOT-6
APPLICATIONS
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.
TYPICAL APPLICATION CIRCUIT
Mult
GATE
COMP CS/ZCD
GND
VCC
MP4026 Rev. 1.0
8/19/2013
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
1
1 page  
MP4026 – PRIMARY SIDE CONTROL, OFFLINE LED CONTROLLER WITH ACTIVE PFC
TYPICAL PERFORMANCE CHARACTERISTICS
VIN = 90V-265V, VOUT = 10-20V, ILED=350mA, TA = 25°C, unless otherwise noted.
MP4026 Rev. 1.0
8/19/2013
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
5
5 Page 
MP4026 – PRIMARY SIDE CONTROL, OFFLINE LED CONTROLLER WITH ACTIVE PFC
The output-OVP-set point is then:
VOUT _ OVP
NAUX
NSEC
R ZCD2
RZCD1 RZCD2
5.1V
Where:
VOUT_OVP is the output-over-voltage-
protection point,
NAUX is the number of auxiliary-winding
turns, and
NSEC is the number of secondary-winding
turns.
Gate_OFF
Latch
+
-
5.1V
OVP
Blanking time
Gate
CS/ZCD
RZCD 2
RZCD 1
R1
Figure 7: OVP Sampling Unit
To prevent a voltage spike from mis-triggering
OVP after the switch turns off, OVP sampling
has a tLEB_OVP blanking period (typically 1.6µs
when VMULT_O > 0.3V and 0.8µs when VMULT_O ≤
0.3V) as shown in Figure 8.
VCS/ZCD
Sampling Here
to its nominal current. The auxiliary-winding
voltage drops to follow the secondary-winding
voltage, VCC drops to less than the UV
threshold, and the system restarts. This
sequence limits the output power and IC
temperature rise if an output short occurs.
Primary-Side Over-Current Protection
The primary-side over-current protection
prevents device damage caused by extremely
excessive current, like primary winding short. If
the CS/ZCD pin voltage rising to 2.5V at gate
turn on interval, as shown in Figure 9, the
primary-side over-current protection signal will
be triggered and latched, the gate driver will be
turned off and the IC works at quiescent mode,
the VCC voltage dropped below the UVLO which
will make the IC shut down, and the system
restarts again.
To avoid mis-trigger by the parasitic
capacitances discharging when the MOSFET
turns on, a LEB time is needed, this LEB time is
relatively smaller than current regulation
sensing LEB time, typical 280ns.
Gate_ON
Latch
+
-
2.5V
OCP
Blanking time
Gate
CS/ZCD
RZCD 2
RZCD 1
R1
0V
t LE B_OV P
Figure 8: ZCD Voltage and OVP Sampler
Output Short-Circuit Protection
If an output short occurs, the ZCD can not
detect the transformer’s zero-current-crossing
point, so the 190μs auto-restart timer triggers
the power MOSFET’s turn-on signal. Then the
switching frequency of the power circuit drops
to about 5kHz, and the output current is limited
Figure 9: Primary-side OCP Sampling Unit
Brown-Out Protection
The MP4026 has brown-out protection: the
internal peak detector detects the peak value of
the rectified sinusoid waveform in MULT pin. If
the peak value is less than the brown-out-
protection threshold 0.3V for 42ms, the IC
recognizes this condition as a brown-out,
quickly drops the COMP voltage to zero, and
disables the power circuit. If the peak value
exceeds 0.4V, the IC restarts and the COMP
voltage rises softly again. This feature prevents
MP4026 Rev. 1.0
8/19/2013
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
11
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet MP4026.PDF ] | |
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