TNY284-290
BYPASS/
MULTI-FUNCTION
(BP/M)
REGULATOR
5.85 V
25
μA
LINE UNDER-VOLTAGE
FAULT
PRESENT
AUTO-
RESTART
COUNTER
6.4 V
RESET
+
DRAIN
(D)
115
μA
BYPASS PIN
UNDER-VOLTAGE
BYPASS
-
CAPACITOR
5.85 V
SELECT AND
V
I
4.9 V
LIMIT
CURRENT
LIMIT STATE
MACHINE
LINE
COMPENSATION
CURRENT LIMIT
COMPARATOR
ENABLE
-
+
1.0 V + V
T
JITTER
CLOCK
DCMAX
OSCILLATOR
THERMAL
SHUTDOWN
ENABLE/
UNDER-
VOLTAGE
(EN/UV)
1.0 V
S
Q
R
Q
OVP
LATCH
LEADING
EDGE
BLANKING
SOURCE
(S)
PI-6639-113011
Figure 3.
Functional Block Diagram.
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:
•
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
capaci-
tor 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 TNY285-290.
•
It provides a shutdown function. When the current into the
bypass pin exceeds ISD, the device latches off until the BP/M
voltage drops below 4.9 V, during a power-down or, when the
UV function is employed with external resistors connected to
the BP/UV pin, by taking the UV/EN pin current below I
UV
minus the reset hysteresis (Typ. 18.75
μA).
This can be used
EN/UV 1
BP/M 2
D Package (SO-8C)
8S
7S
6S
D4
5S
EN/UV 1
Exposed Pad (On Bottom)
Internally Connected to
SOURCE Pin
P Package (DIP-8C)
8S
7S
6S
BP/M 2
K Package
(eSOP-12B)
D4
5S
EN/UV 1
BP/M 2
N/C 3
N/C 4
D6
Figure 4.
Pin Configuration.
12 S
11 S
10 S
9S
8S
7S
PI-6577-053112
2
Rev. A 09/12
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