RDK-115 Power Integrations, RDK-115 Datasheet - Page 2

• Manufacturer Part Number: RDK-115
• Description: KIT REFERENCE DESIGN W/TN376PN
• Manufacturer: Power Integrations
• Series: TinySwitch®-PKr

Specifications of RDK-115

• Main Purpose: AC/DC, Primary Side
• Outputs And Type: 4, Isolated
• Power - Output: 7.5W
• Voltage - Output: 3.3V, 5V, 12V, -12V
• Current - Output: 500mA, 500mA, 250mA, 30mA
• Voltage - Input: 85 ~ 265VAC
• Regulator Topology: Flyback
• Frequency - Switching: 132kHz
• Board Type: Fully Populated
• Utilized Ic / Part: TNY376
• Product: Accessories & Kits
• Lead Free Status / RoHS Status: Not applicable / Not applicable
• Other names: 596-1145

Rev. C 07/09
Figure 2
Pin Functional Description
DRAIN (D) Pin:
This pin is the power MOSFET drain connection. It provides
internal operating current for both start-up and steady-state
operation.
BYPASS/MULTI-FUNCTION (BP/M) Pin:
This pin has multiple functions:
1.
2.
3.
MULTI-FUNCTION
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.
It provides a shutdown function. When the current into the
bypass pin exceeds 7 mA, the device latches off until the
BP/M voltage drops below 4.9 V, during a power down or
when a line undervoltage is detected. This can be used to
provide an output overvoltage function with a Zener diode
connected from the BP/M pin to a bias winding supply.
VOLTAGE
ENABLE/
115 μA
UNDER-
BYPASS/
(EN/UV)
(BP/M)
Functional Block Diagram.
TNY375-380
ENABLE
1.0 V + V
1.0 V
25 μA
T
6.4 V
LINE UNDER-VOLTAGE
OSCILLATOR
JITTER 2X
LATCH
RESET
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
5.85 V
4.9 V
EN/UV
Q
Q
BP/M
G Package (SMD-8C)
P Package (DIP-8C)
D Package (SO-8C)
+
D
-
1
2
4
BYPASS PIN
UNDER-VOLTAGE
REGULATOR
5.85 V
CURRENT LIMIT
COMPARATOR
BLANKING
LEADING
EDGE
8
7
6
5
V
I LIMIT
S
S
S
S
www.powerint.com
+
-
PI-4348-042809
PI-4550-121406
SOURCE
DRAIN
(D)
(S)