IW3620 Datasheet PDF - iWatt
Part Number | IW3620 | |
Description | Digital PWM Current-Mode Controller | |
Manufacturers | iWatt | |
Logo | ||
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Digital PWM Current-Mode Controller for AC/DC LED Driver
1.0 Features
●● Primary-side feedback eliminates opto-isolators and
simplifies design
●● Quasi-resonant operation for highest overall efficiency
●● EZ-EMI ® design to easily meet global EMI standards
●● Up to 130 kHz switching frequency enables small
adapter size
●● Very tight LED constant current regulation
●● No external compensation components required
●● Built-in output constant-current control with primary-side
feedback for LED driver.
●● Low start-up current (10 µA typical)
●● Built-in soft start
●● Built-in short circuit protection and output overvoltage
protection
●● Current sense resistor short protection
●● Overtemperature Protection
●● Open circuit protection
●● Universal input range from 85 Vac to 264 Vac
●● Single-fault protection
●● Small input bulk capacitor
●● Long MTBF
2.0 Description
The iW3620 is a high performance AC/DC offline LED driver
which uses digital control technology to build peak current
mode PWM flyback power supplies. The device operates in
quasi-resonant mode at heavy load to provide high efficiency
along with a number of key built-in protection features while
minimizing the external component count, simplifying EMI
design and lowering the total bill of material cost. The
iW3620 removes the need for secondary feedback circuitry
while achieving excellent line and load regulation. It also
eliminates the need for loop compensation components while
maintaining stability over all operating conditions. Pulse-by-
pulse waveform analysis allows for a loop response that is
much faster than traditional solutions, resulting in improved
dynamic load response. The built-in current limit function
enables optimized transformer design in universal off-line
applications over a wide input voltage range.
3.0 Applications
●● LED lighting
●● High efficiency
L
+
N
VOUT
+
+
Optional
NTC
Thermistor
1 NC
VCC 8
2 VSENSE OUTPUT 7
3 VIN
ISENSE 6
4 SD
GND 5
U1
iW3620
Figure 3.1 : Typical Application Circuit
RTN
Rev. 1.8
iW3620
February 1, 2012
Page 1
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iW3620
Digital PWM Current-Mode Controller for AC/DC LED Driver
6.0 Electrical Characteristics (cont.)
VCC = 12 V, -40°C ≤ TA ≤ 85°C, unless otherwise specified (Note 1)
Parameter
Symbol Test Conditions
ISENSE SECTION (Pin 6)
Peak limit threshold
VPEAK
Isense short protection reference
CC regulation threshold limit (Note 2)
VRSNS
VREG-TH
SD SECTION (Pin 4)
Shutdown threshold
VSD-TH
TA = 25°C
Shutdown threshold in Startup
(Note 2)
VSD-TH(ST)
Input leakage current
Pull down resistance
Pull up current source
IBVSD
RSD
ISD
VSD = 1.0 V
TA = 25°C
TA = 25°C
Min
1.045
0.127
0.95
7916
96
Typ
1.1
0.15
1.0
1.0
1.2
8333
107
Max
1.155
0.173
1.05
1
8750
118
Unit
V
V
V
V
V
µA
W
µA
Notes:
Note 1. Adjust VCC above the start-up threshold before setting at 12 V.
Note 2. These parameters are not 100% tested, guaranteed by design and characterization.
Note 3. Operating frequency varies based on the line and load conditions, see Theory of Operation for more details.
Rev. 1.8
iW3620
February 1, 2012
Page 5
Preview 5 Page |
Part DetailsOn this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for IW3620 electronic component. |
Information | Total 21 Pages | |
Link URL | [ Copy URL to Clipboard ] | |
Download | [ IW3620.PDF Datasheet ] |
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