LNK632DG Datasheet, PDF (1/10 Pages) Power Integrations, Inc. – Energy-Efficient, Accurate CV Switcher With CC Control for Adapters and Chargers

LNK632DG
LinkSwitch^®-II Family
Energy-Efficient, Accurate CV Switcher With CC Control
for Adapters and Chargers
Product Highlights
Dramatically Simplifies CV Converters
• Eliminates optocoupler and all secondary CV/CC control
circuitry
• Eliminates all control loop compensation circuitry
• Enables Clampless^™ designs
Advanced Performance Features
• Compensates for cable voltage drop
• Compensates for external component temperature variations
• Very tight IC parameter tolerances using proprietary trimming
technology
• Frequency jittering greatly reduces EMI filter cost
Advanced Protection/Safety Features
• Auto-restart protection reduces power delivered by about 85%
for output short circuit and control loop faults (open and
shorted components)
• Hysteretic thermal shutdown – automatic recovery reduces
power supply returns from the field
EcoSmart^® – Energy Efficient
• Easily meets all global energy efficiency regulations with no
added components
• No-load consumption down to <30 mW at 230 VAC input with
bias winding
• ON/OFF control provides constant efficiency down to very light
loads – ideal for EISA and ENERGY STAR regulations
• No current sense resistors – maximizes efficiency
Green Package
• Halogen free and RoHS compliant package
Applications
• Chargers for cell/cordless phones, PDAs, MP3/portable audio
devices, adapters, etc.
Description
The LNK632DG dramatically simplifies low power CV/CC charger
designs by eliminating an optocoupler and secondary control
circuitry. The device uses an ON/OFF control technique to provide
very tight output voltage regulation, in addition to output current
control ideal for battery charging applications. The combination of
proprietary IC trimming and E-Shield^™ transformer construction
techniques enables Clampless designs with the LNK632DG when
an external bias circuit is used.
Wide Range
HV DC Input
D
LNK632DG
S
FB
BP/M
PI-5346-022509
(a) Typical application schematic
V_O
±5%
±18%
PI-5292-120908 _IO
(b) Output characteristic
Figure 1. Typical Application – Not a Simplified Circuit (a) and Output
Characteristic Envelope (b).
Output Power Table
Product³
LNK632DG
Adapter¹
3.1 W
85-265 VAC
Open Frame²
3.1 W
Table 1. Output Power Table.
Notes:
1. Minimum continuous power in a typical non-ventilated enclosed adapter measured
at +50 °C ambient.
2. Maximum practical continuous power in an open frame design with adequate
heatsinking, measured at 50 °C ambient.
3. Packages: D: SO-8C.
The device incorporates a 700 V power MOSFET, a novel ON/OFF
control state machine, a high voltage switched current source for
self biasing, frequency jittering, cycle-by-cycle current limit and
hysteretic thermal shutdown circuitry onto a monolithic IC.
www.powerint.com
September 2009