LED Driver. iW3627 Datasheet

iW3627 Driver. Datasheet pdf. Equivalent

iW3627 Datasheet
Recommendation iW3627 Datasheet
Part iW3627
Description Off-Line Digital Constant-Voltage LED Driver
Feature iW3627; iW3627 Off-Line Digital Constant-Voltage LED Driver with Power Factor Correction 1 Description The i.
Manufacture Dialog Semiconductor
Datasheet
Download iW3627 Datasheet




Dialog Semiconductor iW3627
iW3627
Off-Line Digital Constant-Voltage
LED Driver with Power Factor Correction
1 Description
The iW3627 is a high-performance single-stage AC/DC constant voltage (CV) controller with high power factor
correction. It supports most commonly used isolated and non-isolated topologies including flyback, buck-boost, and
buck. The device operates in constant on-time mode to achieve high power factor (>0.9) across a wide load range. It
can achieve excellent output voltage regulation over line and load variation without the need for a secondary feedback
circuit. It also eliminates the need for external loop compensation while maintaining stability over all operating
conditions with different types of loads, including downstream DC-DC converter, constant current (CC) load, LED load,
and constant resistive (CR) load. The iW3627 integrates a proprietary technique that adaptively adjusts output voltage
limits to maintain overshoot and undershoot transients to less than 10% of the nominal output voltage for any load
transient. The iW3627 operates in pulse-frequency-modulation (PFM) mode at light load to eliminate audible noise,
and at the same time achieving less than 200mW no-load standby power consumption.
Dialog’s innovative proprietary technology maximizes the iW3627 performance in a tiny SOT-23 package. The iW3627
provides maximum design flexibility by providing two multi-function pins that allow users to configure maximum and
minimum switching frequencies with no cost or size impact. In addition to providing input voltage sensing for input
under-voltage protection, the VIN pin also enables the active start-up scheme to achieve the shortest possible start-up
time without sacrificing active efficiency.
2 Features
● All-in-one low-cost off-line high power factor (PF)
constant voltage (CV) controller supports flyback,
buck-boost, and buck topologies in isolated or non-
isolated designs
● Primary-side control achieves very tight line and load
regulation (±3%)
Enhanced MOSFET driver supports output power up
to 90W or above in a tiny SOT-23 package
User-configurable minimum switching frequency
(600Hz/1kHz) ensures no-load standby power
consumption < 200mW or below
Internal loop compensation ensures stable operation
with different types of loads: downstream DC-DC
converter, constant current (CC) load, LED load, and
constant resistive (CR) load
● Supports wide range of output capacitance (with output
voltage ripple ranging from 1% to 20% at full load)
Supports universal AC input (90VAC – 277VAC) and
DC input
● Adaptively adjusted output voltage limits
accommodating different load conditions ensures
<10% overshoot and undershoot for any load
transient
User-configurable maximum PWM switching
frequency (90kHz or 120kHz)
● Built-in soft-start achieves fast and smooth start-up
for all different operating conditions
Active start-up scheme enables fastest possible start-
up
● Built-in single-point fault protection features: output
over-load, output over-voltage, output short and input
voltage under-voltage protections
● Built-in over-temperature protection
No audible noise over entire operating range
3 Applications
Smart LED lighting
LED lighting ballast
● Front-end pre-regulator
Product Summary
www.dialog-semiconductor.com
Rev. 1.3
1 of 7
28-April-2017
© 2017 Dialog Semiconductor



Dialog Semiconductor iW3627
iW3627
Off-Line Digital Constant-Voltage
LED Driver with Power Factor Correction
L
RIN
N
DFET
iW3627
6 OUTPUT
VCC 1
5 GND
VIN 3
4 CS/FMIN FB/FMAX 2
VOUT +
VOUT
Figure 3.1 : iW3627 Typical Application Circuit (Isolated Flyback Application)
L
VOUT +
N
VOUT
iW3627
6 OUTPUT
VCC 1
5 GND
VIN 3
4 CS/FMIN FB/FMAX 2
Figure 3.2 : iW3627 Typical Application Circuit (Buck Application)
Product Summary
www.dialog-semiconductor.com
Rev. 1.3
2 of 7
28-April-2017
© 2017 Dialog Semiconductor



Dialog Semiconductor iW3627
iW3627
Off-Line Digital Constant-Voltage
LED Driver with Power Factor Correction
L
N
iW3627
6 OUTPUT
VCC 1
5 GND
VIN 3
4 CS/FMIN
FB/FMAX 2
VOUT +
VOUT
Figure 3.3 : iW3627 Typical Application Circuit (Isolated Flyback Application
Without Using Active Start-up Device)
L
N
iW3627
6 OUTPUT
VCC 1
5 GND
VIN 3
4 CS/FMIN FB/FMAX 2
MCU or
Wireless
Module
VOUT1+
VOUT2 +
VOUT1
VOUT2
Figure 3.4 : iW3627 Typical Application Circuit (Smart Lighting)
Product Summary
www.dialog-semiconductor.com
Rev. 1.3
3 of 7
28-April-2017
© 2017 Dialog Semiconductor







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