LM5070_14 Datasheet, PDF (9/23 Pages) Texas Instruments – Integrated Power Over Ethernet PD Interface and PWM Controller

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Block Diagrams
V_IN
10 PA
UVLO
2V
60V
2V
LT20V
LOCKOUT
1.5V
UVLORTN
V_IN
RCLASS
RSIG
RCLP
5V
1.5V
EN
+ 10V
- V_IN
+ 1.5V
-
Thermal Limit
Gate
Control
LM5070
SNVS308F – OCTOBER 2004 – REVISED APRIL 2006
VBG
EN
V_CC
Power OK
LOCAL_EN
Switch Mode
Power Supply
Controller
See
Figure 3
for Detail
OUT
SS
RT
CS
COMP
FB
ARTN
V_EE
RTN
Figure 3. Top Level Block Diagram
45 PA
0
Slope
Compensation
Generator
OSC
-50 Device Has
No Slope
Compensation
5V
1.25V +
FB
-
SS
5k
100k
1.4V
50k
PWM
+
-
80% MAX
DUTY LIMIT (-80)
50% MAX
DUTY LIMIT (-50)
LOGIC
COMP
2k
+
0.5V
-
CURRENT
LIMIT
CLK
SQ
RQ
10 PA
V_CC
DRIVER
SS
CLK +LEB
RT
OUT
SS
CS
Figure 4. PWM Controller Block Diagram
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