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LNK562 Datasheet(PDF) 2 Page - Power Integrations, Inc.

Part No. LNK562
Description  Energy Effi cient Off-Line Switcher IC for Linear Transformer Replacement
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Maker  POWERINT [Power Integrations, Inc.]
Homepage  http://www.powerint.com
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LNK562 Datasheet(HTML) 2 Page - Power Integrations, Inc.

 
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2
LNK562-564
F
10/05
Figure 2. Functional Block Diagram.
Pin Functional Description
DRAIN (D) Pin:
The power MOSFET drain connection provides internal
operating current for both start-up and steady-state operation.
BYPASS (BP) Pin:
A 0.1
µF external bypass capacitor for the internally generated
5.8 V supply is connected to this pin.
FEEDBACK (FB) Pin:
During normal operation, switching of the power MOSFET is
controlled by this pin. MOSFET switching is disabled when a
current greater than 70
µA flows into this pin.
SOURCE (S) Pin:
This pin is the power MOSFET source connection. It is also the
ground reference for the BYPASS and FEEDBACK pins.
LinkSwitch-LP Functional
Description
LinkSwitch-LP comprises a 700 V power MOSFET switch with
a power supply controller on the same die. Unlike conventional
PWM (pulse width modulation) controllers, it uses a simple
ON/OFF control to regulate the output voltage. The controller
consists of an oscillator, feedback (sense and logic) circuit, 5.8 V
regulator, BYPASS pin under-voltage circuit, over-temperature
PI-3491-111903
FB
D
S
BP
S
S
S
P Package (DIP-8B)
G Package (SMD-8B)
8
5
7
1
4
2
3
Figure 3. Pin Configuration.
protection, frequency jittering, current limit circuit, and leading
edge blanking.
Oscillator
The typical oscillator frequency is internally set to an average
of 66/83/100 kHz for the LNK562, 563 & 564 respectively.
Two signals are generated from the oscillator: the maximum
duty cycle signal (DC
MAX) and the clock signal that indicates
the beginning of each switching cycle.
PI-3958-092905
CLOCK
JITTER
AUTO-RESTART
COUNTER
FAULT
PRESENT
OSCILLATOR
5.8 V
4.85 V
SOURCE
(S)
S
R
Q
DC
MAX
ADJ
BYPASS
(BP)
+
-
VI
LIMIT
LEADING
EDGE
BLANKING
THERMAL
SHUTDOWN
+
-
DRAIN
(D)
BYPASS PIN
UNDER-VOLTAGE
CURRENT LIMIT
COMPARATOR
FEEDBACK
(FB)
OPEN LOOP
PULLDOWN
Q
6.3 V
1.69 V -V
TH
0.8 V
REGULATOR
5.8 V
RESET


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