TNY278GN Power Integrations, TNY278GN Datasheet - Page 2

• Manufacturer Part Number: TNY278GN
• Description: IC OFFLINE SWIT OVP OTP HV 8SMD
• Manufacturer: Power Integrations
• Series: TinySwitch®-IIIr

Specifications of TNY278GN

• Output Isolation: Isolated
• Frequency Range: 124 ~ 140kHz
• Voltage - Output: 700V
• Power (watts): 28W
• Operating Temperature: -40°C ~ 150°C
• Package / Case: 8-SMD Gull Wing, 7 Leads
• Output Voltage: 12 V
• Input / Supply Voltage (max): 265 VAC
• Input / Supply Voltage (min): 85 VAC
• Duty Cycle (max): 65 %
• Switching Frequency: 132 KHz
• Supply Current: 445 uA
• Operating Temperature Range: - 40 C to + 150 C
• Mounting Style: SMD/SMT
• No. Of Outputs: 1
• Voltage Regulator Case Style: SMD
• No. Of Pins: 8
• Base Number: 278
• Controller Type: PWM
• Frequency: 132kHz
• Rohs Compliant: Yes
• For Use With: 596-1194 - KIT DESIGN REF TINYSWITCH-III
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Figure 2.
Rev. I 01/09
Pin Functional Description
DRAIN (D) Pin:
This pin is the power MOSFET drain connection. It provides
internal operating current for both startup and steady-state
operation.
BYPASS/MULTI-FUNCTION (BP/M) Pin:
This pin has multiple functions:
1.
2.
3.
MULTI-FUNCTION
VOLTAGE
2
It is the connection point for an external bypass capacitor for
the internally generated 5.85 V supply.
It is a mode selector for the current limit value, depending on
the value of the capacitance added. Use of a 0.1 μF
capacitor results in the standard current limit value. Use of a
1 μF capacitor results in the current limit being reduced to
that of the next smaller device size. Use of a 10 μF capacitor
results in the current limit being increased to that of the next
larger device size for TNY275-280.
It provides a shutdown function. When the current into the
bypass pin exceeds I
BP/M voltage drops below 4.9 V, during a power down. This
can be used to provide an output overvoltage function with a
Zener connected from the BP/M pin to a bias winding supply.
ENABLE/
115 μA
UNDER-
BYPASS/
(EN/UV)
(BP/M)
Functional Block Diagram.
TNY274-280
ENABLE
1.0 V + V
1.0 V
25 μA
T
SD
, the device latches off until the
6.4 V
LINE UNDER-VOLTAGE
OSCILLATOR
JITTER
LATCH
COUNTER
OVP
RESTART
DC MAX
CLOCK
AUTO-
RESET
PRESENT
FAULT
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 a threshold current is
drawn from this pin. Switching resumes when the current being
Figure 3.
SELECT AND
LIMIT STATE
CAPACITOR
CURRENT
MACHINE
BYPASS
SHUTDOWN
THERMAL
Pin Confi guration.
S
R
EN/UV
5.85 V
BP/M
4.9 V
Q
Q
G Package (SMD-8C)
P Package (DIP-8C)
D
+
-
1
2
4
BYPASS PIN
UNDER-VOLTAGE
REGULATOR
5.85 V
CURRENT LIMIT
COMPARATOR
BLANKING
LEADING
EDGE
8
7
6
5
S
V
S
S
S
I LIMIT
www.powerint.com
+
-
PI-4078-080905
PI-4077-062306
SOURCE
DRAIN
(D)
(S)