LED5000PHR STMicroelectronics, LED5000PHR Datasheet - Page 32

• 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 - buck conversion
32/51
Equation 49
R1 must be dimensioned to limit the D1 rated power so it is an inexpensive small signal
Zener diode.
The overvoltage limits the output voltage in case of LED disconnection so protecting LEDs
when the string is reconnected with the device enabled. In case the OVP is not
implemented, a large amount of non-controlled current could flow through the LEDs during
the output capacitor discharging phase, thereby damaging the devices.
Table 9.
Reference
C1,C2
C3,C6
C4
C5
C7
C8
D1
D2
D3
R
R1
R2
R3
R4
L1
S
Component list
C3225X7S1H106M
C3216X7R1H105K
MSS7341-473MLD
ERJ14BSFR27U
BZX384-C4V7
Part number
BZX384-C39
STPS3L60U
Doc ID 023951 Rev 1
V
OUT
I
ZENER_DIODE
=
V
FB
+
470 pF 50 V (size 00603)
I
(size 7.3 x 7.3 x 4.1 mm)
100 nF 50 V (size 0805)
V
RMS
24.9 k 1% (size 0603)
22 pF 50 V (size 0603)
10 F 50 V (size 1210)
I
=
1 F 50 V (size 1206)
10 k 1% (size 0603)
47 k 1% (size 0603)
SAT
ZENER_DIODE
-------------------- -
R
=1.85 A (40 C rise)
=1.0 A (30% drop)
S
Not mounted
Not mounted
V
Description
(size 1206)
0.27
+
FB
3 A 60 V
47 H
R
1
1%
Manufacturer
Panasonic
Coilcraft
TDK
TDK
ST
LED5000