TNY256 Datasheet, PDF (2/20 Pages) Power Integrations, Inc. – TinySwitch Plus Energy Efficient, Low Power Off-line Switcher

TNY256
BYPASS
(BP)
50 µA
LINE UNDER-VOLTAGE
AUTO-
RESTART
COUNTER
CLOCK
RESET
REGULATOR
5.8 V
5.8 V
5.1 V
BYPASS PIN
UNDER-VOLTAGE
+
-
DRAIN
(D)
1.5 V + VTH
ENABLE/
UNDER-VOLTAGE
(EN/UV)
1.5 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/UNDER-VOLTAGE (EN/UV) Pin:
This pin has dual functions, enable input and line under-voltage
sense. During normal operation, switching of the power
MOSFET is controlled by this pin. MOSFET switching is
terminated when a current greater than 50 µA is drawn out of
this pin. This pin also senses line under-voltage conditions
through an external resistor connected to the DC line voltage.
If there is no external resistor connected to this pin, TNY256
detects this and disables the line under-voltage function.
SOURCE (S) Pin:
Power MOSFET source connection. Primary return.
2
C
7/01
VILIMIT
THERMAL
SHUTDOWN
S
Q
R
Q
LEADING
EDGE
BLANKING
SOURCE
(S)
PI-2367-122398
Tab Internally
Connected to SOURCE Pin
7D
5 NC
4S
3 BP
1 EN/UV
Y Package (TO-220-7B)
BP ¹
S²
S³
EN/UV ⁴
8_S
7_S
6_S
5_D
P Package (DIP-8)
G Package (SMD-8)
Figure 3. Pin Configuration.
NO CONNECT (N) Pin
No connection.
PI-2500-031501