Datasheet

ENfalling
START STOP
ENrising
UVLO1
ENfalling
HYS
ENrising
V
V - V
V
R =
V
I1 × 1- + I
V
æ ö
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ç
÷
ç
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ç
è ø
æ ö
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EN
V
ENA
I
1
I
hys
VIN
TPS55010
R
UVLO2
R
UVLO1
PHVIN
GND
VSENSE
TPS55010
R
HS
R
LS
C
PRI
Npri:Nsec
C
O
V
O
V
PRI
V
FD
0.829V
-
+
SEC
PRI
OUT fd
PRI
N
V = V × - V
N
TPS55010
SLVSAV0A –APRIL 2011–REVISED JUNE 2011 www.ti.com
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Figure 19. Setting the Output Voltage
Enable and Adjusting Undervoltage Lockout
The TPS55010 is disabled when the VIN pin voltage falls below 2.6 V. If an application requires a higher
undervoltage lockout (UVLO), use the EN pin as shown in Figure 20 to adjust the input voltage UVLO by using
two external resistors. The EN pin has an internal pull-up current source of 1.2 µA that provides the default
condition of the TPS55010 operating when the EN pin floats. Once the EN pin voltage exceeds 1.25 V, an
additional 3.4 µA of hysteresis is added. When the EN pin is pulled below 1.18 V, the hysteresis current is
removed.
Figure 20. Adjustable Under Voltage Lock Out
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