KSZ8721BMC-EVAL Micrel Inc, KSZ8721BMC-EVAL Datasheet - Page 22

• Manufacturer Part Number: KSZ8721BMC-EVAL
• Description: BOARD EVALUATION FOR KSZ8721BMC
• Manufacturer: Micrel Inc

Specifications of KSZ8721BMC-EVAL

• Main Purpose: Interface, Ethernet PHY
• Embedded: No
• Utilized Ic / Part: KSZ8721BMC
• Primary Attributes: 1 Port, 100BASE-TX/100BASE-FX/10BASE-T
• Secondary Attributes: MII, RMII, HP Auto MDI, MDI-X Auto Polarity Correction
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 576-1627

Voltage Regulator DC-to-DC Topologies
MIC38C4x
MIC38HC4x
MIC2171
MIC2186*
MIC2196*
MIC38C4x
MIC2142*
MIC2145*
MIC2171*
MIC2172*
MIC2185
MIC2186*
MIC2196*
MIC3808
MIC3809*
MIC3838/9
MIC3808
MIC3809*
MIC3838/9
Note:
* = evaluation board is available.
February 2011
MIC3808/9
MIC3838/9
Device
MIC384HC4x
MIC9130** (POE)
MIC9131*
MIC2288*
MIC2295*
MIC2298
MIC2570*
MIC3172*
V
IN
V
IN
V
V
V
V
IN
IN
IN
IN
Typical Applications
D
T1
n p
n p
n p
n p
n p
D
1
n s
n s
n s
n s
n s
n s
n s
N
T1
V
V
V
V
OUT
OUT
OUT
V
OUT
OUT
21
Pros
Half-Bridge
Step Up and Down
– Isolated Outputs
– Low FET Stress
– Low Transformer Leakage
Eff ≈ 95%
Forward
Step Up and Down
– Isolated Outputs
– Low Side Switch
Low Input/Output Ripple
Eff ≈ 90%
Flyback Applications (External Switches)
Step Up and Down
– Isolated Outputs
– Multiple Outputs
– Negative Output
– High Output Voltage
– Low-Side Switch
Eff ≈ 80%
SEPIC
Step Up and Down
– Low-Side Switch
Eff ≈ 80%
Push-Pull
Step Up and Down
– Isolated Outputs
– Low Side Switches
– Low Input/Output Ripple
Eff ≈ 94%
Full-Bridge
Step Up and Down
– Isolated Outputs
– High Power
– Low FET Stress
Eff ≈ 95%
Cons
I
DC ≈
Transformer instead of Inductor.
High Peak Current.
High Switch-Stress Voltage.
I
DC ≈
I
DC ≈
I
DC ≈
I
DC ≈
High Peak Currents 2 inductors or
coupled inductor.
High Switch-Stress Voltage.
I
DC ≈
SW
SW
SW
SW
SW
SW
(Avg) ≈
(Avg) ≈
(Avg) ≈
(Avg) ≈
(Avg) ≈
(Avg) ≈
(Eff × V
2(Eff × V
2(Eff × V
2(Eff × V
V
V
V
OUT
V
OUT
V
V
OUT
OUT
OUT
OUT
+ N • V
V
V
V
IN
1 – DC
n
+ (V
n
n
n
n
n
n
n
I
OUT
OUT
OUT
S
OUT
S
S
S
P
)
P
P
P
IN
IN
IN
Micrel, Incorporated
×
× I
× I
× I
× I
)
)
)
IN
×
V
×
×
n
× I
OUT
OUT
OUT
OUT
OUT
IN
n
× Eff)
S
n
P
n
n
n
n
n
OUT
• Eff
P
S
P
S
P
S
× Eff
+ I
OUT