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PDF LED2001 Data sheet ( Hoja de datos )
| Número de pieza | LED2001 | |
| Descripción | 4A monolithic step-down current source | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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LED2001
4 A monolithic step-down current source with synchronous
rectification
Datasheet - production data
VFQFPN8 4x4
HSOP8
Features
• 3.0 V to 18 V operating input voltage range
• 850 kHz fixed switching frequency
• 100 mV typ. current sense voltage drop
• PWM dimming
• ± 7% output current accuracy
• Synchronous rectification
• 95 mΩ HS / 69 mΩ LS typical RDS(on)
• Peak current mode architecture
• Embedded compensation network
• Internal current limiting
• Ceramic output capacitor compliant
• Thermal shutdown
Applications
• High brightness LED driving
• Halogen bulb replacement
• General lighting
• Signage
Description
The LED2001 is an 850 kHz fixed switching
frequency monolithic step-down DC-DC converter
designed to operate as precise constant current
source with an adjustable current capability up to
4 A DC. The embedded PWM dimming circuitry
features LED brightness control. The regulated
output current is set connecting a sensing resistor
to the feedback pin. The embedded synchronous
rectification and the 100 mV typical RSENSE
voltage drop enhance the efficiency performance.
The size of the overall application is minimized
thanks to the high switching frequency and
ceramic output capacitor compatibility. The device
is fully protected against thermal overheating,
overcurrent and output short-circuit. The
LED2001 is available in VFQFPN 4 mm x 4 mm
8-lead package, and HSOP8.
Figure 1. Typical application circuit
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May 2013
This is information on a product in full production.
DocID024346 Rev 1
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www.st.com
42
1 page  
LED2001
List of figures
List of figures
Figure 1.
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Figure 33.
Typical application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Pin connection (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
LED2001 block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Internal circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Block diagram of the loop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Transconductance embedded error amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Equivalent series resistor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Load equivalent circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Module plot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Phase plot. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Dimming operation example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
LED current falling edge operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Dimming signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
eDesign studio screenshot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Equivalent circuit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Layout example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Switching losses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Constant current protection triggering Hiccup mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Demonstration board application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
PCB layout (component side) DFN package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
PCB layout (bottom side) DFN package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
PCB layout (component side) HSOP8 package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
PCB layout (bottom side) HSOP8 package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Soft-start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Load regulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Dimming operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
LED current rising edge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
LED current falling edge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Hiccup current protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
OCP blanking time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Thermal shutdown protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
VFQFPN8 (4x4x1.08 mm) package dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
HSOP8 package dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
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LED2001
Functional description
Table 5. Uncompensated error amplifier characteristics
Description
Value
Transconductance
Low frequency gain
CC
RC
250 µS
96 dB
195 pF
70 KΩ
The error amplifier output is compared with the inductor current sense information to
perform PWM control.
5.5 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.
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| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet LED2001.PDF ] | |
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