LED5000PHR STMicroelectronics, LED5000PHR Datasheet - Page 12

• 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
4.4
4.5
4.6
4.7
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During normal operation a new soft-start cycle takes place in case of:
●
●
The soft-start is disabled during the dimming operation to maximize the dimming
performance.
Dimming block
The DIM input features the LED brightness control with the PWM dimming operation (see
Chapter 5.8
Inhibit block
The inhibit block features the standby mode accordingly with
characteristics
reduced to less than 40 µA. The INH pin is 5 V tolerant.
Error amplifier
The voltage error amplifier is the core of the loop regulation. It is a transconductance
operational amplifier whose non inverting input is connected to the internal voltage
reference (200 mV), while the inverting input (FB) is connected to the output current sensing
resistor.
Table 6.
The error amplifier output is compared with the inductor current sense information to
perform PWM control.
Thermal shutdown
The shutdown block generates a signal that disables the power stage if the temperature of
the chip goes higher than a fixed internal threshold (150±10 °C typical). The sensing
element of the chip is close to the PDMOS area, ensuring fast and accurate temperature
detection. A 15 °C typical hysteresis prevents the device from turning ON and OFF
continuously during the protection operation.
Transconductance
Low frequency gain
thermal shutdown event
UVLO event
Description
).
Uncompensated error amplifier characteristics
. The INH pin high level disables the device so the power consumption is
Doc ID 023951 Rev 1
2200 µS
Values
90 dB
Table 5: Electrical
LED5000