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