NCP3065D1SLDGEVB ON Semiconductor, NCP3065D1SLDGEVB Datasheet - Page 7
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NCP3065D1SLDGEVB
Manufacturer Part Number
NCP3065D1SLDGEVB
Description
EVAL BOARD FOR NCP3065D1SLDG
Manufacturer
ON Semiconductor
Specifications of NCP3065D1SLDGEVB
Design Resources
NCP3065D1SLDGEVB BOM NCP3065D1SLDGEVB Gerber Files NCP3065D1SLDGEVB Schematic
Current - Output / Channel
350mA
Outputs And Type
1, Non-Isolated
Voltage - Output
14.4V
Voltage - Input
12V
Utilized Ic / Part
NCP3065
Core Chip
NCP3065
Topology
SEPIC
No. Of Outputs
1
Development Tool Type
Hardware - Eval/Demo Board
Leaded Process Compatible
Yes
Mcu Supported Families
NCP3065
Peak Reflow Compatible (260 C)
Yes
Rohs Compliant
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Features
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
For Use With/related Products
NCP3065D1SLDG
Other names
NCP3065D1SLDGEVBOS
optimized for LED Driver applications. Its flexible
architecture enables the system designer to directly
implement a step−up or step−down topology with a
minimum number of external components for driving LEDs.
A representative block diagram is shown in Figure 4.
OPERATING DESCRIPTION
output voltage ripple gated regulator. In general, this mode
of operation is somewhat analogous to a capacitor charge
pump and does not require dominant pole loop
compensation for converter stability. The typical operating
waveforms are shown in Figure 14. The output voltage
waveform shown is for a step−down converter with the
ripple and phasing exaggerated for clarity. During initial
converter startup, the feedback comparator senses that the
output voltage level is below nominal. This causes the
output switch to turn on and off at a frequency and duty cycle
controlled by the oscillator, thus pumping up the output filter
capacitor. When the feedback voltage level reaches nominal
The NCP3065 is a monolithic power switching regulator
The NCP3065 operates as a fixed oscillator frequency
Feedback Comparator Output
Nominal Output Voltage Level
I
PK
Comparator Output
Timing Capacitor, C
Output Switch
Output Voltage
On
Off
0
0
1
1
T
Figure 14. Typical Operating Waveforms
Startup
http://onsemi.com
INTRODUCTION
7
comparator value, the output switch cycle is inhibited. When
the load current causes the output voltage to fall below the
nominal value feedback comparator enables switching
immediately. Under these conditions, the output switch
conduction can be enabled for a partial oscillator cycle, a
partial cycle plus a complete cycle, multiple cycles, or a
partial cycle plus multiple cycles.
Oscillator
are programmed by the value of the timing capacitor C
Capacitor C
internal current source and sink, generating a positive going
sawtooth waveform at Pin 3. This ratio sets the maximum
t
85.7% (typical). The oscillator peak and valley voltage
difference is 500 mV typically. To calculate the C
value for required oscillator frequency, use the equations
found in Figure 22. An online NCP3065 design tool can be
found at www.onsemi.com, which adds in selecting
component values.
ON
The oscillator frequency and off−time of the output switch
/(t
ON
+t
OFF
T
is charged and discharged by a 1 to 6 ratio
) of the switching converter as 6/(6+1) or
Operation
T
capacitor
T
.