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PDF IW1812 Data sheet ( Hoja de datos )
| Número de pieza | IW1812 | |
| Descripción | Off-Line Digital Green-Mode PWM Controller | |
| Fabricantes | Dialog Semiconductor | |
| Logotipo |  |
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iW1812
Off-Line Digital Green-Mode PWM Controller
Integrated with Power BJT and OTP
1 Description
The iW1812 is a high performance AC/DC power supply control device which uses digital control technology to build
peak current mode PWM flyback power supplies. This device includes an internal power BJT and operates in quasi-
resonant mode 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 iW1812 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 in all operating conditions. The pulse-by-pulse waveform
analysis allows for a loop response that is much faster than traditional solutions, resulting in improved dynamic load
response for both one-time and repetitive load transients. The built-in power limit function enables optimized transformer
design in universal off-line applications and allows for a wide input voltage range.
Dialog’s innovative proprietary technology ensures that power supplies built with the iW1812 can achieve both highest
average efficiency and less than 30mW no-load power consumption in a compact form factor.
2 Features
●● Primary-side feedback eliminates opto-isolators and
simplifies design
●● Internal 800V bipolar junction transistor (BJT)
●● 64kHz PWM switching frequency
●● No-load power consumption < 30mW at 230VAC with
typical application circuit
●● Fast dynamic load response for both one-time and
repetitive load transients
●● Adaptive multi-mode PWM/PFM control improving
efficiency
●● Quasi-resonant operation for highest overall
efficiency
●● Ultra-low start-up current (1.7μA typical)
●● EZ-EMI® design to easily meet global EMI standards
●● Dynamic BJT base drive current control
●● Very tight constant voltage and constant current
regulation with primary-side-only feedback
●● No external compensation components required
●● Complies with EPA 2.0 energy-efficiency
specifications with ample margin
●● Built-in soft start
●● Built-in short-circuit protection and output over-voltage
protection
●● Built-in current-sense-resistor short-circuit protection
●● Built-in over-temperature protection (OTP)
●● No audible noise over entire operating range
3 Applications
●● Low-power AC/DC power supply for smart meters,
motor control, industrial, and home appliances
applications
●● Linear AC/DC replacement
Datasheet
www.dialog-semiconductor.com
Rev. 1.2
1 of 17
26-September-2016
© 2016 Dialog Semiconductor
1 page  
iW1812
Off-Line Digital Green-Mode PWM Controller
Integrated with Power BJT and OTP
7 Electrical Characteristics
VCC = 12V, -40°C ≤ TA ≤ 85°C, unless otherwise specified
Parameter
Symbol Test Conditions
VSENSE SECTION (Pin 6)
Input leakage current
Nominal voltage threshold
Output OVP threshold
ISENSE SECTION (Pin 7)
Over-current threshold
ISENSE regulation upper limit1
ISENSE regulation lower limit1
Input leakage current
VCC SECTION (Pin 4)
Maximum operating voltage1
IBVS
VSENSE(NOM)
VSENSE(MAX)
VSENSE = 2V
TA = 25°C, negative edge
TA = 25°C, negative edge
VOCP
VIPK(HIGH)
VIPK(LOW)
ILK
VCC(MAX)
ISENSE = 1.0V
Start-up threshold
Under-voltage lockout threshold
VCC(ST)
VCC(UVL)
VCC rising
VCC falling
Start-up current
IIN(ST)
VCC = 10V
Quiescent current
ICCQ No IB current
Zener breakdown voltage
VZB
Zener current = 5mA
TA=25°C
BJT Section (Pin 1, Pin 2, and Pin 8)
Min Typ Max Unit
1
1.518 1.533 1.548
1.834
μA
V
V
1.11 1.15 1.19 V
1.0 V
0.23 V
1 μA
16 V
10.0 11.0 12.0 V
3.8 4.0 4.2 V
1.0 1.7 3.0 μA
2.7 4.0 mA
18.5 19.5 20.5 V
Collector cutoff current
Collector-Emitter cutoff current
DC Current Gain2
ICB0 VCB = 800V, IE = 0A
VCE = 800V, REB = 0Ω,
TA = 25°C
ICES
VCE = 800V, REB = 0Ω,
TA = 100°C
VCE = 500V, REB = 0Ω,
TA = 25°C
VCE = 5V, IC = 0.2A
15
hFE
VCE = 5V, IC = 0.3A
10
VCE = 5V, IC = 1mA
10
0.01 mA
0.01
0.02 mA
0.005
40
30
Datasheet
www.dialog-semiconductor.com
Rev. 1.2
5 of 17
26-September-2016
© 2016 Dialog Semiconductor
5 Page 
iW1812
Off-Line Digital Green-Mode PWM Controller
Integrated with Power BJT and OTP
Assuming the secondary winding is master, and the auxiliary winding is slave,
1
VAUX
=
VO
x
NAUX
NS
VAUX
0V
2
VAUX
=
-VIN
x
NAUX
NP
Figure 10.3 : Auxiliary Voltage Waveforms
The auxiliary voltage is given by:
=VAUX
N AUX
NS
(VO
+ ∆V)
(10.5)
and reflects the output voltage as shown in Figure 10.3.
The voltage at the load differs from the secondary voltage by a diode drop and IR losses. Therefore, if the secondary
voltage is always read at a constant secondary current, the difference between the output voltage and the secondary
voltage is a fixed ΔV. Furthermore, if the voltage can be read when the secondary current is small, ΔV is also small.
With the iW1812, ΔV can be ignored.
The real-time waveform analyzer in the iW1812 reads this information cycle by cycle. The part then generates a
feedback voltage VFB. The VFB signal accurately represents the output voltage under most circumstances and is used
to regulate the output voltage.
10.4 Constant Voltage Operation
After soft-start is completed, the digital control block measures the output conditions. It determines the output power
levels and adjusts the control system according to either a light or a heavy load. If this is in the normal range, the
device operates in the Constant Voltage (CV) mode, and changes the pulse width (TON) and off-time (TOFF) in order to
meet the output voltage regulation requirements.
If no voltage is detected on VSENSE, it is assumed that the auxiliary winding of the transformer is either open or shorted
and the iW1812 shuts down.
10.5 Current Limit and Constant Current Operation
The constant current (CC mode) is useful in battery charger and LED driver applications. During the operation in CC
mode the iW1812 regulates the output current at a constant level regardless of the output voltage, while avoiding con-
tinuous conduction mode.
To achieve this regulation the iW1812 senses the load current indirectly through the primary current. The primary
current is detected by the ISENSE pin through a resistor from the BJT emitter to ground.
Datasheet
www.dialog-semiconductor.com
Rev. 1.2
11 of 17
26-September-2016
© 2016 Dialog Semiconductor
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet IW1812.PDF ] | |
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