IW1692 Datasheet PDF - iWatt
| Part Number | IW1692 | |
| Description | Low Power Off-Line Digital PWM Controller | |
| Manufacturers | iWatt | |
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iW1692
Low-Power Off-line Digital PWM Controller
1.0 Features
• Primary-side feedback eliminates opto-isolators and
simplifies design
• Multi-mode operation for highest overall efficiency
• Built-in cable drop compensation
• Very tight output voltage regulation
• No external loop compensation components required
• Complies with CEC/EPA/IEC no load power consumption
and average efficiency regulations
• Built-in output constant-current control with primary-side
feedback
• Low start-up current (10 µA typical)
• Built-in soft start
• Built-in short circuit protection
• AC line under/overvoltage and output overvoltage
protection
• 40 kHz PWM switching frequency
• PFM operation at light load
• Built-in ISENSE pin short protection
• Space-saving SOT-23 package
2.0 Description
The iW1692 is a high performance AC/DC power supply
controller which uses digital control technology to build
peak current mode PWM flyback power supplies. The device
provides high efficiency along with a number of key built-in
protection features while minimizing the external component
count and bill of material cost. The iW1692 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 power limit function enables optimized transformer
design in universal off-line applications and allows for a wide
input voltage range.
The low start-up power and PFM operation at light load
ensure that the iW1692 is ideal for applications targeting the
newest regulatory standards for standby power.
3.0 Applications
• Low power AC/DC adapter/chargers for cell phones,
PDAs, digital still cameras
• Standby supplies for televisions, DVDs, set-top boxes
and other consumer electronics
L
N
+
+ + VOUT
RTN
+
4 VCC
OUTPUT 3
5 ISENSE
GND 2
6 VIN
VSENSE 1
U1
iW1692
Figure 2.0.1 iW1692 Typical Application Circuit
Rev. 2.0
iW1692
February 13, 2012
Page 1
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iW1692
Low-Power Off-line Digital PWM Controller
8.0 Functional Block Diagram
VIN
6
VINSW
VSENSE
1
GND
2
VCC
4
ADC
VIN_A
0.2 V ~ 2.0 V
VINSW
Start-up
Signal
Conditioning
VVMS
VFB
Digital
Logic
Control
VOCP
DAC
Gate
Driver
– 1.0 V
+
VIPK
IPEAK
0.2 V ~ 0.9 V
+
––
OUTPUT
3
ISENSE
5
Figure 8.0.1 iW1692 Functional Block Diagram
9.0 Theory of Operation
The iW1692 is a digital controller which uses a new,
proprietary primary-side control technology to eliminate the
opto-isolated feedback and secondary regulation circuits
required in traditional designs. This results in a low-cost
solution for low power AC/DC adapters. The core PWM
processor uses fixed-frequency Discontinuous Conduction
Mode (DCM) operation at heavy load and switches to variable
frequency operation at light loads to maximize efficiency.
Furthermore, iWatt’s digital control technology enables fast
dynamic response, tight output regulation, and full featured
circuit protection with primary-side control.
Referring to the block diagram in Figure 8.0.1, the digital
logic control generates the switching on-time and off-time
information based on the line voltage and the output voltage
feedback signal. The system loop is internally compensated
inside the digital logic control, and no external analog
components are required for loop compensation. The iW1692
uses an advanced digital control algorithm to reduce system
design time and improve reliability.
Furthermore, accurate secondary constant-current operation
is achieved without the need for any secondary-side sense
and control circuits.
The iW1692 uses PWM mode control at higher output
power levels and switches to PFM mode at light load to
minimize power dissipation. Additional built-in protection
features include overvoltage protection (OVP), output
short circuit protection (SCP), AC low line brown out, over
current protection, single pin fault protection and ISENSE fault
detection.
iWatt’s digital control scheme is specifically designed to
address the challenges and trade-offs of power conversion
design. This innovative technology is ideal for balancing new
regulatory requirements for green mode operation with more
practical design considerations such as lowest possible cost,
smallest size and high performance output control.
Rev. 2.0
iW1692
February 13, 2012
Page 5
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Part DetailsOn this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for IW1692 electronic component. |
| Information | Total 18 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ IW1692.PDF Datasheet ] | |
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