LTC4269IDKD-2#TRPBF Linear Technology, LTC4269IDKD-2#TRPBF Datasheet - Page 30

IC PD/SYNC FORWARD CTRLR 32-DFN

LTC4269IDKD-2#TRPBF

Manufacturer Part Number
LTC4269IDKD-2#TRPBF
Description
IC PD/SYNC FORWARD CTRLR 32-DFN
Manufacturer
Linear Technology
Type
Power Over Ethernet (PoE)r
Datasheet

Specifications of LTC4269IDKD-2#TRPBF

Applications
Power Interface Switch for Power Over Ethernet (PoE) Devices
Voltage - Supply
14 V ~ 16 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
32-DFN
Current - Supply
1.35mA
Interface
IEEE 802.3af
Controller Type
Powered Device Interface Controller (PD)
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

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LTC4269-2
applicaTions inForMaTion
Example (3) Time For Maximum Duty Cycle Clamp to
Reach Within X% of Target Value
A maximum duty cycle clamp of 72% was calculated previ-
ously in the section ‘Programming Maximum Duty Cycle
Clamp’. The programmed value used for SS_MAXDC(DC)
was 1.84V.
The time for SS_MAXDC to charge from its minimum value
V
0
SS(MIN)
For X = 2 and V
= t(1.803) – t(0.45)
t(SS_MAXDC charge time within X% of target)
= t[(1 – (X/100) • SS_MAXDC(DC)] – t(V
to within X% of SS_MAXDC(DC) is given by:
SS(MIN)
= 0.45V, t(0.98 • 1.84) – t(0.45)
SS(MIN)
)
From previous calculations, t(0.45) = 7.3e
Using previous values for R
Hence the time for SS_MAXDC to charge from its mini-
mum reset threshold of 0.45V to within 2% of its target
value is given by:
t(1.803) = 2.63e
= 2.63e
t(1.803) – t(0.45) = 1.03e
–3
• (–1) • ln(0.02) = 1.03e
–4
• 1e
–7
T
• (–1) • ln(1 – 1.803/1.84)
–2
, R
– 7.3e
B
and C
–2
–4
SS
s
= 9.57e
,
–4
s.
–3
s
42692fb

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