Datasheet
Table Of Contents
- Figure 1. Typical application circuit
- 1 Pin settings
- 2 Maximum ratings
- 3 Electrical characteristics
- 4 Functional description
- 5 Application notes - buck conversion
- 5.1 Closing the loop
- 5.2 GCO(s) control to output transfer function
- 5.3 Error amplifier compensation network
- 5.4 LED small signal model
- 5.5 Total loop gain
- 5.6 Compensation network design
- 5.7 Example of system design
- 5.8 Dimming operation
- 5.9 Component selection
- 5.10 Layout considerations
- 5.11 Thermal considerations
- 5.12 Short-circuit protection
- 5.13 Application circuit
- 6 Application notes - alternative topologies
- 7 Package mechanical data
- 8 Ordering information
- 9 Revision history
LED5000 Application notes - alternative topologies
Doc ID 023951 Rev 1 37/51
Equation 57
R1 must be dimensioned to limit the D1 rated power so it is an inexpensive small signal
Zener diode.
The overvoltage protection plays an important role for the inverting buck-boost topology. In
fact, in case of open row, the output voltage tends to diverge thus exceeding the input
voltage absolute maximum rate and the device would be damaged (see
Equation 50
). The
overvoltage protection limits V
OUT
and thereby it protects the device in case of load
disconnection.
To design the compensation network for the inverting buck-boost topology please refer to
paragraph
Chapter 6.4: Compensation network design for alternative topologies
.
Figure 26. Inverting BB PCB layout (component side)
Figure 27. Inverting BB PCB layout (bottom side)
V
OUT
V
FB
V
ZENER_DIODE
+=
I
ZENER_DIODE
V
FB
R
S
R
1
+
---------------------=
AM13510v1
AM13511v1