si3400 Silicon Laboratories, si3400 Datasheet - Page 7

• Manufacturer Part Number: si3400
• Description: Fully-integrated 802.3-compliant Pd Interface And Switching Regulator
• Manufacturer: Silicon Laboratories

Table 5. Electrical Characteristics
VPORT
Input Offset Current
Diode bridge leakage
IPORT Classification
IPORT Operating Current
Current Limit
Hotswap FET On-Resistance +
R
Power loss VPORT Threshold
Switcher Frequency
Maximum Switcher Duty Cycle
Switching FET On-Resistance
Regulated Feedback @ pin FB
Regulated Output Voltage Tolerance
Notes:
SENSE
1. Transient surge defined in IEC60060 as a 1000 V impulse of either polarity applied to CT1–CT2 or SP1–SP2. The
2. The classification currents are guaranteed only when recommended RCLASS resistors are used, as specified in
3. IPORT includes full operating current of switching regulator controller.
4. The PD interface includes dual-level input current limit. At turn-on, before the HSO load capacitor is charged, the
5. See “AN296: Using the Si3400/01 PoE PD Controller in Isolated and Non-Isolated Designs” for more information.
6. Applies to non-isolated applications only (VOUT on schematic in Figure 1).
shape of the impulse shall have a 300 ns full rise time and a 50 µs half fall time with 201 Ω source impedance.
Table 11.
current limit is set at the inrush level. After the capacitor has been charged within ~1.25 V of VNEG, the operating
current limit is engaged. This higher current limit remains active until the UVLO lower limit has been tripped or until the
hotswap switch is sufficiently current-limited to cause a foldback of the HSO voltage.
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Parameter
2
3
5
6
6
Output voltage tolerance @
ISOSSFT connected to
36 V < VPORT < 57 V
36 V < VPORT < 57 V
Transient Surge
Preliminary Rev. 0.91
UVLO Turn Off
UVLO Turn On
VPORT < 10 V
VPORT = 57 V
Classification
Description
Operating
Detection
DC Avg.
Class 0
Class 1
Class 2
Class 3
Class 4
Inrush
VOUT
VDD
1
350 (Si3400)
470 (Si3401)
Min
2.7
0.5
0.3
62
27
–5
14
—
30
—
—
17
26
36
—
—
—
—
—
0
9
Si3400/Si3401
1.23
Typ
130
525
550
350
30
50
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
2
Max
0.86
3.1
1.4
11
22
42
36
79
10
25
12
20
30
44
33
—
—
—
—
—
4
5
Unit
kHz
mA
mA
µA
µA
mA
mA
%
%
Ω
Ω
V
V
V
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