LED2000PUR STMicroelectronics, LED2000PUR Datasheet - Page 10

• Manufacturer Part Number: LED2000PUR
• Description: LED Lighting Drivers 3.0V to 18V 850kHz 100mV 95mOhm HS
• Manufacturer: STMicroelectronics

Specifications of LED2000PUR

• Rohs: yes
• Input Voltage: 3 V to 18 V
• Operating Frequency: 850 kHz
• Maximum Supply Current: 3 A
• Mounting Style: SMD/SMT
• Package / Case: VFQFPN-8L
• Power Dissipation: 2 W

Functional description
5.2
5.3
5.4
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and the device is enabled. The pre-regulator block supplies the BandGap cell with a pre-
regulated voltage that has a very low supply voltage noise sensitivity.
Voltage monitor
An internal block continuously senses the V
good, the regulator begins operating. There is also a hysteresis on the V
Figure 4.
Soft-start
The startup phase is implemented ramping the reference of the embedded error amplifier in
1 ms typ. time. It minimizes the inrush current and decreases the stress of the power
components at power-up.
During normal operation a new soft-start cycle takes place in case of:
●
●
The soft-start is disabled when DIM input goes high in order to maximize the dimming
performance.
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 (100 mV), while the inverting input (FB) is connected to the output current sensing
resistor.
The error amplifier is internally compensated to minimize the size of the final application.
Table 5.
Transconductance
Low frequency gain
Thermal shutdown event
UVLO event.
Description
Internal circuit
Uncompensated error amplifier characteristics
D00IN126
STARTER
Doc ID 023432 Rev 3
Vcc
IC BIAS
CC
, V
ref
and V
PREREGULATOR
BANDGAP
bg
VREG
250 µS
. If the monitored voltages are
Value
96 dB
VREF
CC
(UVLO).
AM12895v1
LED2000