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油烟机如何清洗P S C O N F I D E N T I A L R I C H F I E L D T N A L U S E O N L Y D I S T R I B U T E
MPS CONFIDENTIAL AND PROPRIETARY INFORMATION - RICHFIELD INTERNAL USE ONLY
MP4688
80V Input, 1A High Power LED Driver
The Future of Analog IC Technology
DESCRIPTION
The MP4688 is a high voltage input step-down switching regulator to deliver a constant current of up to 1A to high power LEDs. It integrates a high-side high voltage power MOSFET with a current limit of 3.2A (typical value). The wide 4.5V to 80V input range accommodates a variety of step-down applications, making it ideal for automotive, industry and general lighting applications. Hysteresis current mode control is applied for very fast respon, which makes the 20kHz dimming frequency possible. MPS’s proprietary feedback control scheme minimizes the number of external components while delivering a LED current with typical ±5% accuracy.
The switching frequency is up to 2MHz, thus allowing for small component size. The thermal shut down, short circuit protection, and optional output voltage limitation provide reliable, fault tolerant operations. A 170µA quiescent current allows its u in battery-powered applications. The MP4688 is available in SOIC8 with expod pad packages. FEATURES
土豆的各种做法• Wide 4.5V to 80V Operating Input Range • No Output Capacitor Required • ±5% LED Current Accuracy
• Hysteretic Control: No Compensation • Up to 2MHz Switching Frequency • Up to 20kHz Dimming Frequency
• Dedicated PWM Dimming Control Input
•
Short circuit protection with integrated high side MOSFET
• Optional Output Voltage Limitation • Thermal shut down
• 200mV reference voltage for high efficiency • Up to 95% Efficiency
• 170μA Quiescent Current
• Available in SOIC8 with Expod Pad
Packages
APPLICATIONS
• High Power LED Driver
• Automotive, Industry and General Lighting • Constant Current Source
“MPS” and “The Future of Analog IC Technology” are Registered Trademarks of Monolithic Power Systems, Inc.
TYPICAL APPLICATION
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ORDERING INFORMATION
Part Number*
Package
Top Marking
Free Air Temperature (T A )
MP4688DN SOIC8E MP4688 –40°C to +85°C
* For Tape & Reel, add suffix –Z (e.g. MP4688DN–Z);
For RoHS compliant packaging, add suffix –LF (e.g. MP4688DN–LF–Z)
PACKAGE REFERENCE
ABSOLUTE MAXIMUM RATINGS (1)
Supply Voltage (V IN ).....................–0.3V to +80V Switch Voltage (V SW )............–0.5V to V IN + 0.5V
BST .–0.3V to +6V
All –0.3V to +6V 150°C
Continuous Power Dissipation (T A = +25°C) (2) .............................................................2.5W 260°C –65°C to +150°C Recommended Operating Conditions (3)猕猴桃花粉
Supply Voltage V IN ...........................4.5V to 75V EN and 0V to 5V Operating Junct. –40°C to +125°C
Thermal Resistance (4)
θJA θJC
SOIC8E (Expod Pad)..........50......10...°C/W Notes: 1) Exceeding the ratings may damage the device.
2) The maximum allowable power dissipation is a function of the
maximum junction temperature T J (MAX), the junction-to-ambient thermal resistance θJA , and the ambient temperature
T A . The maximum allowable continuous power dissipation at any ambient temperature is calculated by P D (MAX)=(T J (MAX)-T A )/θJA . Exceeding the maximum allowable power dissipation will cau excessive die temperature, and the regulator will go into thermal shutdown. Internal thermal shutdown circuitry
protects the device from permanent damage.
3) The device is not guaranteed to function outside of its
operating conditions.
4) Measured on JESD51-7 4-layer board.
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ELECTRICAL CHARACTERISTICS
V IN = 60V, T A = +25°C, unless otherwi noted.
Specifications over temperature are guaranteed by design and characterization.
Parameter Symbol Condition Min Typ Max Units VIN UVLO Threshold 3.6 4.0 4.4 V VIN UVLO Hysteresis 0.4 V Shutdown Supply Current V EN = 0V 2 5 µA Quiescent Supply Current
No load, V FB = 250mV 170 220µA
Upper Switch On Resistance (5) R DS(ON) V BST – V SW = 5V 360 m Ω Upper Switch Leakage Current I SWLK V EN = 0V, V SW = 0V 0.01 1 µA Current Limit I PK V FB = 0.15V 2.5 3.2 A EN Up Threshold
V ENH 1.4 1.55 1.7 V EN Threshold Hysteresis V ENHY 320 mV EN Input Current I ENI V EN =5V 0.01 1 µA EN Sinking Current I ENS V EN =
2V 2 3 µA DIM Up Threshold
V DIMH 0.8 1.15 1.5 V DIM Threshold Hysteresis V DIMHY 300 mV DIM Input Current
I DIM V DIM =5V or 0V -1 1 µA DIM On Propagation Delay T DIMDH V FB =0V, V DIM Rising edge to
V SW Rising Edge
50 ns
DIM Off Propagation Delay T DIMDL V FB =0V, V DIM Falling edge to
V SW Falling Edge
闺蜜网名50 ns
Feedback Voltage Threshold High (5) V FBH 4.5V < V IN < 75V, V FB rising
from 0V until V SW < 30V
210 215 220mV
Feedback Voltage Threshold Low (5) V FBL 4.5V < V IN < 75V, V FB falling
from 0.25V until V SW > 30V
180 185 190mV
FB Pin Input Current I FB V FB =5V or 0V -300 300nA
FB Propagation Delay to Output
宫崎骏电影High
T FBDH Falling edge of V FB from
0.25V to 0V to V SW rising edge
100 ns
FB Propagation Delay to Output
High
T FBDL Rising edge of V FB from 0V
to
0.25V to V SW falling edge
100 ns Thermal Shutdown Hysteresis = 20°C
150 °C Note:
5) Guaranteed by design.
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消毒柜的使用方法
PIN FUNCTIONS
SOIC8E
Pin #
狮子座的守护星Name Description
1 FB Feedback. This is the input to hysteretic comparators. An external current nsing resistor is
connected in ries with the LEDs to GND. The feedback voltage is connected to this pin
and is regulated at +200mV with 15% current ripple.
2 N/C Not connected
3 VIN Input Supply. This supplies power to all the internal control circuitry, both BS regulators and
the high-side switch. A decoupling capacitor to ground must be placed clo to this pin to
minimize switching spikes.
4 BST
Bootstrap. This is the positive power supply for the internal floating high-side MOSFET
driver. Connect a bypass capacitor between this pin and SW pin.
5 SW
Switch Node. This is the output from the high-side switch. A low V F Schottky rectifier to
ground is required. The rectifier must be clo to the SW pins to reduce switching spikes. 6 DIM PWM Dimming Input. Pulling this pin below the specified threshold for dimming off.Pulling it
枝繁叶茂的近义词up above the specified threshold for dimming on. If there is no need for dimming function,
connect DIM and EN pins together.
7 EN
Enable Input. Pulling this pin below the specified threshold shuts the chip down. Pulling it up
above the specified threshold or leaving it floating enables the chip.
8 GND, Expod pad Ground. It should be connected as clo as possible to the output capacitor avoiding the
high current switch paths. Connect expod pad to GND plane for optimal thermal
performance.
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BLOCK DIAGRAM
Figure 1—Function Block Diagram
