Texas Instruments 5Vout, 7W, IEEE 802.3-2005 Compliant, PD Controller, PS Controller EVM for TPS23753AEVM-001 TPS23753AE TPS23753AEVM-001 Fiche De Données
Codes de produits
TPS23753AEVM-001
GATE
RTN
VC
CS
VDD
VSS
DEN
BLNK
FRS
VB
CTL
CLS
1
2
3
4
5
6
7
2
3
4
5
6
7
8
14
13
13
11
10
9
12
APD
VDD1
TPS23753A
www.ti.com
SLVS933B – JULY 2009 – REVISED JANUARY 2010
ELECTRICAL CHARACTERISTICS (continued)
PoE and Control
[V
[V
DD
= V
DD1
] or [V
DD1
= RTN], V
VC-RTN
= 0 V, all voltages referred to V
SS
. Typical specifications are at 25°C.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
THERMAL SHUTDOWN
Turn off temperature
135
145
155
°C
Hysteresis
(2)
20
°C
(2)
These parameters are provided for reference only.
DEVICE INFORMATION
TOP VIEW
Table 1. Terminal Functions
TERMINAL
I/O
DESCRIPTION
NO.
NAME
1
CTL
I
The control loop input to the PWM (pulse width modulator). Use V
B
as a pull up for CTL.
5 V bias rail for dc/dc control circuits. Apply a 0.1
m
F to RTN. V
B
may be used to bias an external
2
V
B
O
optocoupler for feedback.
Dc/dc converter switching MOSFET current sense input. Connect CS to the high side of R
CS
per
3
CS
I
Dc/dc converter bias voltage. The internal startup current source and converter bias winding output
4
V
C
I/O
power this pin. Connect a 0.22
m
F minimum ceramic capacitor to RTN, and a larger capacitor to
facilitate startup.
5
GATE
O
Gate drive output for the dc/dc converter switching MOSFET.
6
RTN
RTN is the negative rail input to the dc/dc converter and output of the PoE hotswap.
7
V
SS
Negative power rail derived from the PoE source.
8
V
DD1
Source of dc/dc converter startup current. Connect to V
DD
for most applications.
9
V
DD
Positive input power rail for PoE interface circuit. Derived from the PoE source.
Connect a 24.9 k
Ω
resistor from DEN to V
DD
to provide the PoE detection signature. Pulling this pin
10
DEN
I/O
to V
SS
during powered operation causes the internal hotswap MOSFET to turn off.
11
CLS
O
Connect a resistor from CLS to V
SS
to program the classification current per
Pull APD above 1.5 V to disable the internal PD hotswap switch, forcing power to come from an
12
APD
I
external adapter. Connect to the adapter through a resistor divider.
Connect to RTN to utilize the internally set blanking period or connect through a resistor to RTN to
13
BLNK
I/O
program the blanking period.
14
FRS
I/O
Connect a resistor from FRS to RTN to program the converter switching frequency.
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