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PDF HT7L4091 Data sheet ( Hoja de datos )
| Número de pieza | HT7L4091 | |
| Descripción | Universal Step-Down PWM Control | |
| Fabricantes | Holtek Semiconductor | |
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Universal Step-Down PWM Control
For High Brightness LED Lighting Control
HT7L4091
Revision: v1.00 Date: �Ap�r��i�l��28�,���2�0�11�
Datasheet pdf - http://www.DataSheet4U.net/
1 page  
www.DataSheet.co.kr
HT7L4091
Universal Step-Down PWM Control
For High Brightness LED Lighting Control
Pin Assignment
VIN
CS
GND
GDR
18
27
36
45
HT7L4091
8 SOP-A
RT
LD
VDD
PDM
Pin Description
Pin Name
VIN
CS
GND
GDR
I/O
I
I
—
O
PDM
I
VDD
O
LD I
RT I
Description
Input voltage pin
LED string current sense input
Power ground
Gate driver for the external MOSFET
PWM dimming pin
Also functions as enable input pin.
Positive Power supply
Used for the internal circuits except the gate driver circuit. A 0.1μF capacitor must be
connected between the VDD and the GND pins.
Linear dimming pin
Set the current sense threshold as long as the voltage on this pin is less than 250mV
(typ.).
Oscillator control pin
A resistor is connected between the RT and the GND pins to set the off-time.
Absolute Maximum Ratings
Output Current Peak ....................................................................................................................... 1A
Storage Temperature Range.......................................................................................-65°C ~ +150°C
Junction Temperature Range......................................................................................-40°C ~ +150°C
CS, PDM, LD ,RT, to GND..................................................................................-0.3V to (VDD +0.3V)
Power Dissipation at Ta<25 °C................................................................................................... 0.6W
Thermal Resistance, SOP-8 θJA..........................................................................................150°C/W
ESD Voltage Protection, Human Body Model............................................................................. 6KV
ESD Voltage Protection, Machine Model................................................................................... 400V
Note: These are stress ratings only. Stresses exceeding the range specified under “Absolute Maximum
Ratings” may cause substantial damage to the device. Functional operation of this device at other
conditions beyond those listed in the specification is not implied and prolonged exposure to extreme
conditions may affect device reliability.
Rev. 1.00
5 April 28, 2011
Datasheet pdf - http://www.DataSheet4U.net/
5 Page 
www.DataSheet.co.kr
HT7L4091
Universal Step-Down PWM Control
For High Brightness LED Lighting Control
Enhanced Short Circuit Protection
When most LEDs are shorted in the application circuit, the current regulation may lose control
resulting in the current increasing to an extremely high level. When the current is more than twice
of the set Ipeak, resulting from externally shorted LEDs, the device will shut down gate driving
operations.
The operation state is shown in the accompanying figure. When the circuit is operating normally,
VCS can be limited to VCS-TH, while some LEDs are shorted, the LED current is still limited and the
output voltage is adjusted to meet the current requirement. If the circuit encounters a serious short,
the voltage increase of (current) in TBlank would be larger than the decrease in TOFF, VCS will exceed
VCS-TH and reach VCS-Short. The HT7L4091 will then shut down the gate driver until UVLO resets the
HT7L4091.
VCS-Sho�t
Normal
Slight Serious
Short Short
Shut Down
VCS-TH
VCS
TB�ank TOff
Cin Rlim
CVDD
VDD
Vin
LD GDR
PDM
RT
CS
GND
Clim
D1
L1
RCS
Rev. 1.00
11
April 28, 2011
Datasheet pdf - http://www.DataSheet4U.net/
11 Page | ||
| Páginas | Total 26 Páginas | |
| PDF Descargar | [ Datasheet HT7L4091.PDF ] | |
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