LED5000PHR STMicroelectronics, LED5000PHR Datasheet - Page 10

• 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

Functional description
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Functional description
The LED5000 is based on a “peak current mode” architecture with fixed frequency control.
As a consequence the intersection between the error amplifier output and the sensed
inductor current generates the control signal to drive the power switch.
The main internal blocks shown in the block diagram in
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Figure 3.
A fully integrated sawtooth oscillator with a typical frequency of 850 kHz
A transconductance error amplifier
An high side current sense amplifier to track the inductor current
A pulse width modulator (PWM) comparator and the circuitry necessary to drive the
internal power element
The soft-start circuitry to decrease the inrush current at power-up
The dimming block to implement PWM dimming
The inhibit block for standby operation
The current limitation circuit based on the pulse-by-pulse current and the HICCUP
protection
The bootstrap circuitry to drive the embedded N-MOS switch
A circuit to implement the thermal protection function
SOFTSTART
0. 1V
LED5000 block diagram
OSC
E/A
Vc
Vsum
COMP
FB
OCP
REF
COMP
Doc ID 023951 Rev 1
COMP
OCP
DIMMING
DIM
REGULATOR
CONTROL
MOSFET
LOGIC
VIN
UVLO
INH
INH
Vdrv_p
Vdrv_n
I2V
Figure 3
DRIVER
DRIVER
I_ SENSE
DMD
are:
R
SENSE
GND
LED5000
SW
AM13487v1