LinkSwitch-4 Family
Energy-Efficient, Accurate Primary-Side Regulated
CV/CC Switcher for Adapters and Chargers
Product Highlights
+
Dramatically Simplifies CV/CC Converters
• Eliminates optocoupler and all secondary CV/CC control circuitry
• Eliminates all control loop compensation circuitry
LinkSwitch-4
U1
LNK4xx2S
BD
ED
Advanced Performance Features
~
ꢁꢀꢀ
FB
• Dynamic base drive technology provides flexibility in choice of BJT
transistor by dynamically optimizing BJT switching characteristics
• Extends RBSOA of BJT
ꢀS
GND
• Dramatically reduces sensitivity to BJT gain
• Compensates for input line voltage variations
• Compensates for cable voltage drop
PI-7462-122315
Figure 1. Typical Application (SOT-23-6) (S).
• Compensates for external component temperature variations
• Very accurate IC parameter tolerances using proprietary trimming
technology
+
• Frequency up to 65 kHz to reduce transformer size
• The minimum peak current is fixed to improve transient load response
BD
ED
Enhanced Performance Features
ꢁꢀꢀ
~
LinkSwitch-4
U1
LNK40x3D
• Easy start for starting into capacitive loads (LNK4114D, LNK4115D)
• Constant power for high current start-up (LNK4214D, LNK4215D)
• 13003 drive improved efficiency with 13003 BJT’s (LNK4302S,
LNK4322S)
SBD
FB
ꢀS
GND
Advanced Protection/Safety Features
• Single fault output overvoltage and short-circuit
• Over-temperature protection
PI-7464-010815
Figure 2. Typical Application (SO-8) (D).
• Active clamp
Output Power Table
EcoSmart™– Energy Efficient
85 - 265 VAC
• Meets DoE 6 and CoC V5 2016 via an optimized quasi-resonant
switching PWM/PFM control
• No-load consumption of <30 mW at 230 VAC input
Product3,4
Features5
Adapter1
Open Frame2
LNK43x2S
LNK40x2S
LNK40x3S
LNK4323S
LNK40x3D
LNK4323D
LNK40x4D
LNK4114D
13003 Drive
STD
5 W
6.5 W
8 W
Green Package
• Halogen free and RoHS compliant package
STD
STD
STD
STD
Applications
8 W
• Chargers for cell/cordless phones, PDAs, MP3/portable audio
devices, adapters, networking, etc.
10 W
10 W
15 W
15 W
15 W
18 W
18 W
Description
STD
The LinkSwitchTM-4 family of ICs dramatically simplifies low power CV/CC
charger design by eliminating an optocoupler and secondary control
circuitry. The LinkSwitch-4 family adaptive BJT drive technology uses
combined base and emitter switching to boost switching performance
and deliver higher efficiency, wider Reverse Bias Safe Operating Area
(RBSOA) margin and the flexibility to accommodate a wide range of low
cost BJT. The device incorporates a multimode PWM/PFM controller
with quasi resonant switch to maximize the efficiency, meets low
no-load power and at same time maintain fast transient response
greater than 4.3 V with a load change from 0% to 100%.
Easy Start
LNK4214D Easy Start + Constant Power
LNK4115D Easy Start
LNK4215D Easy Start + Constant Power
Table 1. Output Power Table.
Notes:
1. Minimum continuous power in a typical enclosed adapter measured at +50 °C
ambient, 85-265 VAC device TJ ≤ 100 °C.
2. Maximum practical continuous power in an open frame design with adequate
heat sinking, measured at +50 °C.
3. Package: D: SO-8 , S: SOT-23-6.
4. Cable compensation factor. x = 0 (no cable compensation),
x = 1 (3% cable compensation) x = 2 (6% cable compensation).
5. Easy Start feature uses the BJT current to directly charge CVCC, allowing
start-up into large output capacitors. 13003 drive feature has the gate drive
optimized for maximum efficiency when using 13003 BJTs. Constant power
feature provides 175% of rated current at start-up, allowing start-up into
large output capacitors (see Figure 15). STD are standard products with all
the advanced performance and protection/safety features.
Figure 3. SOT-23-6 and SO-8 Packages.
www.power.com
May 2018
This Product is Covered by Patents and/or Pending Patent Applications.