TNY266PG Datasheet, PDF (2/22 Pages) Power Integrations, Inc. – Enhanced, Energy Effi cient, Low Power Off-line Switcher

TNY263-268
BYPASS
(BP)
240 MA
50 MA
LINE UNDER-VOLTAGE
AUTO-
RESTART
COUNTER
FAULT
PRESENT
6.3 V
RESET
ENABLE
1.0 V + VT
ENABLE/
UNDER-
VOLTAGE
(EN/UV)
1.0 V
JITTER
CLOCK
DCMAX
OSCILLATOR
Figure 2. Functional Block Diagram.
Pin Functional Description
DRAIN (D) Pin:
Power MOSFET drain connection. Provides internal operating
current for both start-up and steady-state operation.
BYPASS (BP) Pin:
Connection point for a 0.1 μF external bypass capacitor for the
internally generated 5.8 V supply.
ENABLE/UNDERVOLTAGE (EN/UV) Pin:
This pin has dual functions: enable input and line undervoltage
sense. During normal operation, switching of the power
MOSFET is controlled by this pin. MOSFET switching is
terminated when a current greater than 240 μA is drawn from
this pin. This pin also senses line undervoltage conditions
through an external resistor connected to the DC line voltage.
If there is no external resistor connected to this pin,
TinySwitch-II detects its absence and disables the line
undervoltage function.
SOURCE (S) Pin:
Control circuit common, internally connected to output
MOSFET source.
REGULATOR
5.8 V
CURRENT
LIMIT STATE
MACHINE
+
-
5.8 V
4.8 V
BYPASS PIN
UNDER-VOLTAGE
VILIMIT
CURRENT LIMIT
COMPARATOR
DRAIN
(D)
THERMAL
SHUTDOWN
S
Q
R
Q
LEADING
EDGE
BLANKING
SOURCE
(S)
PI-2643-030701
P Package (DIP-8B)
G Package (SMD-8B)
BP 1
S2
S3
EN/UV 4
8 S (HV RTN)
7 S (HV RTN)
5D
PI-2685-101600
Figure 3. Pin Configuration.
SOURCE (HV RTN) Pin:
Output MOSFET source connection for high voltage return.
2
Rev. H 02/09
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