LED5000PHR STMicroelectronics, LED5000PHR Datasheet - Page 29
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LED5000PHR
Manufacturer Part Number
LED5000PHR
Description
Current & Power Monitors & Regulators 3A monolithic Conv 850kHz Synch
Manufacturer
STMicroelectronics
Datasheet
1.LED5000PHR.pdf
(51 pages)
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
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
LED5000PHR
Manufacturer:
ISSI
Quantity:
1 001
LED5000
5.12
For the calculation we can estimate R
during the operation.
T
I
The overall internal losses are:
Equation 41
Equation 42
The junction temperature of device will be:
Equation 43
Where T
ambient. The junction-to-ambient (Rth
HSO8 package and mounted on the evaluation is about 40 °C/W.
Assuming the ambient temperature around 40 °C, the estimated junction temperature is:
Short-circuit protection
In overcurrent protection mode, when the peak current reaches the current limit threshold,
the device disables the power element and it is able to reduce the conduction time down to
the minimum value (approximately 100 nsec typical) to keep the inductor current limited.
This is the pulse-by-pulse current limitation to implement constant current protection feature.
In overcurrent condition, the duty cycle is strongly reduced and, in most applications, this is
enough to limit the switch current to the current threshold.
The inductor current ripple during ON and OFF phases can be written as:
●
Equation 44
●
Q
SW_EQ
has a typical value of 2.4 mA at V
ON phase
OFF phase
P
TOT
A
is approximately 12 ns.
is the ambient temperature and Rth
=
P
TOT
0.3
=
1.5
R
I
DSON_HS
2
L TON
0.7
=
T
+
Doc ID 023951 Rev 1
J
V
------------------------------------------------------------------------------------------------- - T
42
=
T
IN
I
J
OUT
60
–
=
1.5
V
IN
+
T
OUT
DSON_HS
J-A
= 48 V.
1.2W
2
A
+
) thermal resistance of the device assembled in
12
–
Rth
D
DCR
+
J A
V
J-A
10
40
–
= 300 m as a consequence of Tj increase
IN
L
–
L
9
is the thermal resistance junction-to-
+
-------
W
I
P
R
OUT
C
850
Application notes - buck conversion
TOT
DSON HS
110 C
f
10
SW
3
+
42
T
I
SW
ON
+
2.4
V
IN
10
I
–
Q
3
1.2W
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