LinkZero-LP Power Integrations, Inc., LinkZero-LP Datasheet - Page 2

• Manufacturer Part Number: LinkZero-LP
• Description: LinkZero-LP, an upgrade to PI's popular LinkSwitch-LP, incorporates new technology which enables the device to automatically enter into and wake up from no-load mode while disipating less than 5 mW - substantially less than the IEC definition of zero
• Manufacturer: Power Integrations, Inc.

Rev. B 12/07/10
Figure 2
Pin Functional Description
DRAIN (D) Pin:
The power MOSFET drain connection provides internal
operating current for both startup and steady-state operation.
BYPASS/MULTI-FUNCTIONAL PROGRAMMABLE (BP/M) Pin:
An external bypass capacitor for the internally generated 5.85 V
supply is connected to this pin. The value of capacitor
establishes the power down period. The minimum value of
capacitor is 0.1 mF. An overvoltage protection disables the
switching if the current into the pin exceeds 6.5 mA (I
FEEDBACK (FB) Pin:
During normal operation, switching of the power MOSFET is
controlled by this pin. MOSFET switching is disabled when a
voltage greater than an internal V
to the FEEDBACK pin.
The V
load to 1.37 V at no-load in CV mode, and 1.70 V to 0.9 V in CC
mode. Below 0.9 V the part enters auto-restart operation.
SOURCE (S) Pin:
This pin is the power MOSFET source connection. It is also the
ground reference for the BYPASS and FEEDBACK pins.
MULTI FUNCTION
2
OPEN LOOP
FEEDBACK
PULL UP
FB
BYPASS/
(BP/M)
(FB)
reference voltage is internally adjusted from 1.70 V at full
Functional Block Diagram.
LNK574
COUNTER
CYCLES
POWER
160 f
DOWN
OSC
FEEDBACK REF
1.70 V - 1.37 V
GENERATOR
0.9 V
CC CUT BACK
1.70 V - 0.9 V
FB
reference voltage is applied
+
COUNTER
RESET
EVENT
AUTO-RESTART
COUNTER
RESET
+
OSCILLATOR
ADJ
3 V
CLOCK
PU
JITTER
SD
DC
).
+
MAX
FAULT
PU
6.5 V
RESTART
SYSTEM
POWER
DOWN/
Figure 3.
+
OVERVOLTAGE
PROTECTION
Pin Configuration.
5.85 V
4.85 V
BP/M
FB
D
D Package (SO-8C)
+
-
1
2
4
S
R
Q
Q
BLANKING
LEADING
EDGE
UNDERVOLTAGE
BYPASS PIN
PI-5509-111810
REGULATOR
CURRENT LIMIT
8
7
6
5
5.85 V
S
S
S
S
+
-
www.powerint.com
VI
LIMIT
PI-5507-060210
SOURCE
DRAIN
(D)
(S)