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AS1138 Datasheet(PDF) 6 Page - List of Unclassifed Manufacturers

Part # AS1138
Description  30W PoE PD and DC-DC Controller
PDF  30 Pages
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Manufacturer  ETC2 [List of Unclassifed Manufacturers]
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AS1138 Datasheet(HTML) 6 Page - List of Unclassifed Manufacturers

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AS1138
Akros Silicon, Inc.
6399 San Ignacio Avenue, Suite 250, San Jose, CA 95119 USA
408.746.9000
www.AkrosSilicon.com
6
Table 4 - Electrical Characteristics
Description
Min
Typical1
Max
Units
Comments
PD (all PD voltage limits specified at the RJ45 interface)
Inrush current limit (af) – Type 1
PD
50
150
200
mA
For VDD48O ≤ 16V during startup
Inrush current limit (at) – Type 2
PD
100
295
350
mA
For VDD48O ≤ 16V during startup
Operating current – Type 1
350
mA
Pin 9 (RCURR) pulled to GND; device
configured for 13W operation
Operating current – Type 2
720
mA
Pin 9 (RCURR) left open; device
configured for 30W operation
PoE current limit – Type 1 (ILIM-AF)
350
400
500
mA
Pin 9 (RCURR) pulled to GND; device
configured for 13W operation
PoE Current limit – Type 2 (ILIM-AT)
720
800
925
mA
Pin 9 (RCURR) left open; device
configured for 30W operation
Switch on resistance, RDS-ON
0.8
1
measured at 350mA input
Min Detection Signature voltage
2.7
V
Max Detection Signature voltage
10.1
12.5
13
V
Classification lower threshold
11
12.5
14.5
V
During Classification, the AS1138 sinks
current as defined Table 3.
Classification upper threshold
20.5
22
24
V
Min Mark Event voltage
6.9
V
Max Mark Event voltage
10
12.5
13
V
Mark Event current
0.25
4
mA
When the input voltage is less than
VMARK_TH Min (IEEE® 802.3at-2009)
during the Classification signature, a
Type 2 PD must draw Mark Event
current.
Classification-Mark hysteresis
1
V
Classification reset voltage
2.81
6.9
V
ATDET high (VOH)
4.7
4.9
5.1
V
Under 2mA output
ATDET low (VOL)
0.0
0.02
0.1
V
2ma input current
UVLO threshold, VIN_RISING
37
38
42
V
UVLO threshold, VIN_FALLING
30
32
34
V
DC-DC Controller
FOSC (SMPS) switching frequency
80
100
120
kHz
Rosc=178k
DC-DC Controller
operating frequency,
selected by using Rosc
(1%) resistor on FSEL
pin
200
225
250
Rosc=100k
315
350
385
Rosc=53.6k
450
500
550
Rosc=36.8k
FOSC temperature coefficient
0.12
%/C
NDRV ROUT
1.2
3
Output drive resistance
NDRV voltage
4.7
NDRV voltage follows VBN power supply
voltage
Gate drive dynamic response
NDRV TR, TF
2.2
2
nS
nS
10% - 90% with CLOAD = 1 nF
Max. NDRV duty cycle
80
%
Measured at 350kHz
Min. NDRV duty cycle
6
10
%
Measured at 350kHz
VBN
4.7
V
Internal supply voltage; sets VOH of
NDRV.
Error amplifier reference voltage
1.45
1.5
1.55
V
Compared to input of the FB pin
VPK, peak current sense threshold
voltage at CS
500
600
700
mV
IPEAK=VPK/RSENSE
Soft start ramp time
2
ms
Conditions: CSS=100nF
COMP source current
80
µA
FB = 0V, COMP=0V
COMP sink current
80
µA
FB = 5V, COMP=5V



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