TYN256P Power Integrations Inc., TYN256P Datasheet - Page 2

• Manufacturer Part Number: TYN256P
• Description: Energy Efficient/ Low Power Off-line Switcher
• Manufacturer: Power Integrations Inc.

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 F 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 A 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
UNDER-VOLTAGE
ENABLE/
(EN/UV)
TNY256
B
8/99
BYPASS
(BP)
50 A
1.5 V + V TH
1.5 V
OSCILLATOR
LINE UNDER-VOLTAGE
JITTER
COUNTER
RESTART
DC MAX
AUTO-
CLOCK
CLOCK
RESET
5.8 V
5.1 V
NO CONNECT (N) Pin
No connection.
Figure 3. Pin Configuration.
SHUTDOWN
THERMAL
+
-
R
S
Connected to Source Pin
BYPASS PIN
UNDER-VOLTAGE
Q
Q
Tab Internally
EN/UV
BP
REGULATOR
TO-220 (YO7B)
SMD-8 (GO8A)
DIP-8 (PO8A)
S
S
5.8 V
1
2
3
4
BLANKING
LEADING
EDGE
8
7
6
5
S
S
S
D
+
-
7 D
4 S
3 BP
5 NC
1 EN/UV
V I
LIMIT
PI-2500-072199
PI-2367-122398
SOURCE
DRAIN
(D)
(S)