LED5000PHR STMicroelectronics, LED5000PHR Datasheet - Page 36

• Manufacturer Part Number: LED5000PHR
• Description: Current & Power Monitors & Regulators 3A monolithic Conv 850kHz Synch
• Manufacturer: STMicroelectronics

Specifications of LED5000PHR

• Rohs: yes
• Product: Current Regulators
• Supply Voltage - Max: 48 V
• Supply Voltage - Min: 5.5 V
• Operating Temperature Range: - 40 C to + 150 C
• Mounting Style: SMD/SMT
• Package / Case: HPSO-8
• Accuracy: +/- 3 %
• Input Voltage Range: 5.5 V to 48 V
• Output Current: 23 uA
• Sensing Method: High or Low Side
• Supply Current: 1.7 mA

Application notes - alternative topologies
36/51
Figure 24. LED current source based on inverting BB topology
The circuitry Q1, R2, R3, R4 implements a level shifter to convert the dimming signal
voltage levels (referred to GND) to the device rails, since the LED5000 local ground is
referred to the negative output voltage (given by the voltage drop across the LEDs and the
sensing resistor).
DIM pin, the yellow the SW (high level is V
current (see
Figure 25. Inverting BB dimming operation
The network D1, R1, RS implements an inexpensive overvoltage protection. R1 effect can
be neglected during normal operation since the FB biasing current is negligible (tens of nA,
see
In case the load is disconnected or in case of open LED:
GND
VIN
DIM
Table 5: Electrical characteristics
TP4
TP1
TP3
10uF
50V
C2
Figure 54
C3
10uF
50V
Figure 25
BC807-16
R2
100K
) and the purple is the output voltage.
Q1
R3
10K
shows the dimming operation: the light blue trace represents the
JUMPER
R4
47K
T1
2
Doc ID 023951 Rev 1
1uF
50V
C5
100nF
C4
50V
) but it limits the current flowing in the Zener diode D1.
IN
1
2
7
3
, low level is -V
U1
BOOT
DIM
VIN
INH
GND
6
C1
EP
EP
LED5000
100nF
R5
10K
COMP
C6
1.5nF
SW
4
FB
C7
15pF
8
5
OUT
), the green trace the inductor
R1
small signal
D1
RS1
0.2
100K
-Vout
D2
C8
4.7uF
LED5000
TP5
C9
NM
TP2
AM13509v1
AM13508v1
VLED-
VLED+