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NCP5030 PDF даташит

Спецификация NCP5030 изготовлена ​​​​«ON Semiconductor» и имеет функцию, называемую «Buck Boost Converter to Drive a Single LED».

Детали детали

Номер произв NCP5030
Описание Buck Boost Converter to Drive a Single LED
Производители ON Semiconductor
логотип ON Semiconductor логотип 

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NCP5030
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Buck−Boost Converter
to Drive a Single LED from 1
Li−Ion or 3 Alkaline
Batteries
The NCP5030 is a fixed frequency PWM buck−boost converter
optimized for constant current applications such as driving
high−powered white LED. The buck−boost is implemented in an
H−bridge topology and has an adaptive architecture where it operates
in one of three modes: boost, buck−boost, or buck depending on the
input and output voltage condition. This device has been designed
with high−efficiency for use in portable applications and is capable
of driving in DC up to 900 mA into a high power LED for flashlight /
torch applications. To protect the device cycle−by−cycle current
limiting and a thermal shutdown circuit have been incorporated as
well as output over−voltage protection. The 700 kHz switching
frequency allows the use of a low value 4.7 mH and ceramic
capacitors. The NCP5030 is housed in a low profile space efficient
3x4 mm thermally enhanced WDFN.
Features
Efficiency: 87% at 500 mA and 3.3 V VIN
Internal Synchronous Rectifier, No Schottky Diodes
Adjustable Switching Limit Current to Optimize inductor size
0.3 mA Shut−down Control with “True−Cut off”
Input Voltage Range from 2.7 V to 5.5 V
200 mV Feedback Voltage
Output Over−voltage and Thermal Shut Down Protection
Typical Applications
Portable Flashlight / Torch Lights
Vin
1 Cell
Cin
Li−Ion
1 mF
2.7 to 5.5
C2
10 mF
Cin
4.7 mH
L1
39 k
R1
ENABLE
PCA
CTRL
VOUT
C3
22 mF
D1
VS
NCP5030
Cout
L1: TDK RLF7030T−4R7M3R4
C1: 1 mF 6.3 V X5R
C2: 10 mF 3.6 V 0805
TDK: C2012X5R0J106MT
C3: 22 mF 6.3 V X5R
TDK: C2012X5R0J226MTJ
C4
22 pF
R2
100 k
C5
330 pF
R3
220 m
RSENSE
Figure 1. Typical Application Circuit
This document contains information on a product under development. ON Semiconductor
reserves the right to change or discontinue this product without notice.
© Semiconductor Components Industries, LLC, 2006
November, 2006 − Rev. P1
1
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12 MARKING
DIAGRAM
11
WDFN12 3x4
MT SUFFIX
CASE 506AY
5030
ALYWG
G
5030 = Specific Device Code
A = Assembly Location
L = Wafer Lot
Y = Year
W = Work Week
G = Pb−Free Package
(Note: Microdot may be in either location)
PIN CONNECTIONS
FB 1
COMP 2
CTRL 3
PVIN 4
LX1 5
LX1 6
12 PCA
11 AGND
10 VIN
13
9 VS
8 VOUT
7 LX2
(Top View)
Exposed pad (Pin 13) is PGND
must be soldered to PCB GND plane
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 13 of this data sheet.
Publication Order Number:
NCP5030/D









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NCP5030
100
95
90
85
80
75
70
65
60
55
50
2.5
Iout = 300 mA
3.0 3.5 4.0 4.5 5.0
VIN (V)
Figure 2. Efficiency vs. Vin Voltage
5.5
C1
1 mF
Vbat
10 mF X5R 0805 6.3 V
C2
4.7 mH
L1
VIN 10 PVIN 4 LX1 5/6
LX2 7
PCA
12
R1
39 k
3
CTRL
Osc Thermal
700 kHz Shutdown
PWM CONTROLLER
Bandgap
11 1
AGND
FB
2
COMP
C4
22 pF
R2
100 k
C5
330 pF
13
PGND
Figure 3. Simplified Block Diagram
VOUT
Up to 900 mA
8
9
VS
C3
LED
R3
220 m
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NCP5030
PIN FUNCTION DESCRIPTION
Pin Name
Type
Description
1
FB
INPUT
Feedback: Reference voltage is 200 mV. The cathode of the LED and a resistor to ground to set the
LED current should be connected at this point. A "5% metal film resistor, or better, is recommended
for best output accuracy. An analog signal can be applied to this input to dim the LED.
2
COMP
INPUT
Loop Compensation: A frequency compensation network must be connected between this pin to
the ground to ensure the stability of the closed loop. See “loop compensation” guidelines.
3
CTRL
INPUT
Control and Enable: An active High logic level on this pin enables the device. A built−in pulldown
resistor disables the device if the input is left open. This pin can also be used to control the average
current into the load by applying a low frequency PWM signal. If a PWM signal is applied, the
frequency should be high enough to avoid optical flicker, but be no greater than 1.0 kHz.
4
PVIN POWER
Power Voltage Input Supply: A 10 mF ceramic capacitor or larger must bypass this input to the
ground. This capacitor should be placed as close a possible to this input.
5/6 LX1 POWER Switch LX1: Both pins are connected to the input node of the H−bridge. The inductor should be
connected between this node and LX2. The recommended inductor size is 4.7 mH.
7 LX2 POWER Switch LX2: This pin is connected to the opposite node of the H−bridge and the power inductor is
connected between this node and LX1.
8
VOUT POWER
Power Output: A filter capacitor is necessary on this pin for the stability of the loop, to smooth the
current flowing into the load, and to limit the noise created by the fast transients present in this
circuitry. A 22 mF ceramic capacitor bypass to GND or larger is recommended. For White LED
applications, this pin is also connected to the anode of the LED. Care must be observed to avoid
EMI through the PCB copper tracks connected to this pin.
9
VS
POWER
Voltage Sense: , This pin must be connected to COUT with a dedicated track to minimize serial
parasitic inductor and to sense VOUT with high accuracy. This pin supplies some of the NCP5030
internal blocks when the voltage is higher than VIN.
10 VIN POWER Supply Pin: This pin supplies the internal control circuitry and must be connected to PVIN.
Recommended bypass capacitor is 1.0 mF ceramic or larger.
11 AGND POWER Analog Ground: This pin is the system ground and carries the analog signals. This pin must be
connected to the ground plan like PGND.
12 PCA INPUT Peak Current Adjust: A resistor between this input and ground controls the maximum peak current
allowed in the inductor. The minimum value for this resistor is 30 kW. Increasing this value decreases
the peak current. This allows the user to adjust the current based on the application needs and scale
the size of the inductor accordingly. See “Switch Current Limit“guidelines in application section.
13 PGND POWER Power Ground: This pin is the power ground for NCP5030 and carries the switching current. Care
must be observed to avoid high−density current flow in a limited PCB copper track.
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NCP5030Buck Boost Converter to Drive a Single LEDON Semiconductor
ON Semiconductor

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