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PDF CR5608 Data sheet ( Hoja de datos )
| Número de pieza | CR5608 | |
| Descripción | AC/DC Digital Power Controller | |
| Fabricantes | iWatt | |
| Logotipo |  |
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CR5608
AC/DC Digital Power Controller for
Single-Stage High Power Factor Dimmable LED Drivers
1.0 Features
●● Isolated/non-isolated offline120VAC/230VAC LED driver
up to 15W output power
●● Wide line frequency range (from 45Hz to 66Hz)
●● Meets IEC61000-3-2 current harmonic requirement
●● Total harmonic distortion < 20% with PF > 0.92
●● Wide dimmer compatibility
xx Leading-edge dimmer
xx Trailing-edge dimmer
●● Dimming range from 10% to 100%
●● Resonant control to achieve high efficiency (typical > 82%
without dimmer)
●● Over-temperature LED current foldback
●● Small solution size
xx Single-stage topology reduces part counts
xx 90kHz maximum switching frequency enables small
transformer use
●● Primary-side sensing eliminates the need for opto-isolator
feedback
●● Tight LED current regulation (± 5%)
●● Fast start-up (< 0.5s without dimmer)
●● Compatible with NEMA SSL6 dimming curve standard
●● Multiple protection features that include:
xx LED open-circuit and short-circuit protection
xx Over-current protection
xx Over-temperature protection
xx Current sense resistor short-circuit protection
xx AC line over-voltage protection
2.0 Description
The CR5608 is a single-stage, high-performance AC/DC
offline power supply controller for dimmable LED luminaires.
It uses advanced digital control technology to detect the
dimmer type, which provides dynamic impedance to interface
with the dimmer and control the LED brightness at the same
time.
With advanced dimmer detection technology, the CR5608
can operate with most wall dimmers including leading-edge
dimmers (R-type or R-L type) and trailing-edge dimmers
(R-C type). The CR5608’s cycle-by-cycle waveform analysis
technology allows for a fast dimmer setting response. When
no dimmer is on the line, the CR5608 optimizes the power
factor and minimizes the current harmonic distortion to the
AC line. In no dimmer condition, output current is regulated
at nominal output current value over a wide input voltage
range.
The CR5608 operates the main power converter that
delivers current to the LED load in quasi-resonant mode
to provide high power efficiency and minimize electro-
magnetic interference (EMI). The commonly used converter
topologies for CR5608 are buck-boost and flyback. It uses
iWatt’s patented PrimAccurateTM primary-side sensing
technology to achieve excellent LED current regulation
under different AC line and LED load voltages, without using
a secondary-side feedback circuit and thus eliminating the
need for an opto-coupler.
The CR5608 minimizes the external component count by
simplifying the EMI filter with iWatt’s EZ-EMI® technology.
The intelligent dimmer detection technology minimizes the
bleeding power loss. Additionally, the CR5608 digital control
loop maintains stable overall operating conditions without
the need for loop compensation components.
3.0 Applications
●● Dimmable LED retrofit lamps up to 15W
●● Dimmable LED luminaries up to 15W
Rev. 0.2
CR5608
Preliminary
Page 1
1 page  
CR5608
AC/DC Digital Power Controller for
Single-Stage High Power Factor Dimmable LED Drivers
6.0 Electrical Characteristics (continued)
VCC = 12V, -40°C ≤ TA ≤ 85°C, unless otherwise specified (Note 1)
Parameter
Symbol Test Conditions
ISENSE SECTION
ISENSE short protection reference
Over-current limit threshold
VRSENSE
VOCP
Min Typ
0.16
1.5
Configuration current source
ICFG(ISENSE)
475 500
IIN SECTION
IIN pin operation voltage
VIIN
0.3
Max
525
Unit
V
V
µA
V
Notes:
Note 1. Adjust VCC above the start-up threshold before setting at 12V.
Note 2. Operating frequency varies based on the line and load conditions. See the “Theory of Operation” section for more
details.
Note 3. These parameters refer to digital preset values, and they are not 100% tested.
Rev. 0.2
CR5608
Preliminary
Page 5
5 Page 
CR5608
AC/DC Digital Power Controller for
Single-Stage High Power Factor Dimmable LED Drivers
9.4.2 Dimming Control
Vin Vin Vin_a
Sense
Input Voltage Vin_a(avg)
Average
Vpk(dim)
1
.8705 V
(a) Dimming Control
Vsense
Output Current
Estimation
VIout(avg) _
+
0.35 V
Closed Loop Vpk(closed_loop)
Regulator
(b) Closed-loop Control
Figure 9.5 : Output Current Regulation
In CR5608, the reference Vpk waveform is determined by the
sensed VIN signal and the estimated output current (shown
in Figure 9.5).
Under dimming control, the reference waveform Vpk is
generated by equation 9.4.
(9.4)
Where Vpk(dim) is the Vpk value under dimming control,
Vin_a is the sensed Vin value inside CR5608 chip, Vin_a(avg)
is the averaged value of Vin_a over one half-AC-cycle. If the
estimated output current value is less than the nominal
value I ,out(avg)(NOM) CR5608 stays in the dimming control
[shown in Figure 9.5(a)]. When Vin changes, Vpk also adjusts
accordingly to change the output current.
rating start points. ISENSE pin configuration selects the dimming
curves. By connecting resistors R8, R9, and R13 with different
values to VSENSE and ISENSE pins respectively, different dimming
curves and temperature starting points are selected. Table 9.1
and 9.2 show the temperature starting points and the dimming
curves respectively vs. the resistor values.
VSENSE CFG
Option
Number
VSENSE Pin Resistors
(R8//R9 in Fig. 11.1)
Typical Tolerance
Value(kW)
Temperature
Derating Starting
Point TDERATE(ST)(°C)
(Fig. 9.6)
0 0.72 ≤ 5%
1 1.38 ≤ 5%
2 2.30 ≤ 5%
3 3.60 ≤ 5%
100
105
110
115
Table 9.1 VSENSE Pin Configuration Resistor Values
ISENSE CFG
Option
Number
ISENSE Pin Resistors
(R10 in Fig.11.1)
Dimming Curve
Number
(Fig. 10.6)
Typical Tolerance
Value(kW)
0
0.5 ≤ 5%
option 1
1
1.2 ≤ 5%
option 2
2
2.20 ≤ 5%
option 3
3
3.60 ≤ 5%
option 4
Table 9.2 ISENSE Pin Configuration Resistor Values
9.6 Protection Features
This section provides information about CR5608 protection
features.
If the output current value is equal to or higher than the
nominal value I ,out(avg)(NOM) CR5608 switches to the closed
loop control immediately. Under the closed loop control,
Vpk(closed_loop) regulates the output current to the 100%
of the nominal value regardless of input voltage (shown in
Figure 9.5 (b)).
9.5 VSENSE and ISENSE Configuration
Function
At start-up, a current source in the controller drives the
configuration current ICFG (500µA) into VSENSE and ISENSE pin
alternatively after VCC reaches VCC(ST). The CR5608 reads
their pin voltages respectively to determine the configuration
options. VSENSE pin configuration selects the temperature de-
9.6.1 Output Over-Voltage/LED Open Protection
The CR5608 includes a function that protects against an
output over-voltage.
The output voltage is monitored by the VSENSE pin. The ratio
between the VSENSE pin voltage and output voltage is equal
to the auxiliary to secondary winding turns-ratio multiplied
by the VSENSE resistor divider ratio (R8 and R9 in Figure
11.1). If the voltage at the VSENSE pin exceeds VSENSE(MAX),
the CR5608 shuts down its output pins (BLEEDER pin and
OUTPUT pin) immediately. As a result, the bleeder and the
power converter circuits are turned off. After the output pin
shutdown, the CR5608 remains powered, which discharges
the VCC. To avoid over-charging the output voltage, the
Rev. 0.2
CR5608
Preliminary
Page 11
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet CR5608.PDF ] | |
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