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PDF AT9933 Data sheet ( Hoja de datos )
| Número de pieza | AT9933 | |
| Descripción | Hysteretic Boost-Buck LED Driver IC | |
| Fabricantes | Microchip | |
| Logotipo |  |
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AT9933
Hysteretic Boost-Buck (Ćuk) LED Driver IC
Features
• Constant Current LED Driver
• Steps Input Voltage Up or Down
• Low Electromagnetic Interference (EMI)
• Variable Frequency Operation
• Internal 75V Linear Regulator
• Input and Output Current Sensing
• Input Current Limit
• Enable and Pulse-width Modulation (PWM)
Dimming
• Ambient Temperature Rating of up to 125°C
Applications
• LED Lighting Applications
General Description
The AT9933 is a variable frequency PWM controller IC,
designed to control an LED lamp driver using a
low-noise boost-buck (Ćuk) topology. It uses
patent-pending Hysteretic Current-mode control to
regulate both the input and the output currents. This
enables superior input surge immunity without the
necessity for complex loop compensation. Input
current control enables current limiting during Startup,
Input Undervoltage and Output Overload conditions.
The AT9933 provides a low-frequency PWM dimming
input that can accept an external control signal with a
duty cycle of 0%–100% and a high dimming ratio.
This AT9933-based LED driver is ideal for LED lamps.
The part is rated for up to 125°C ambient temperatures.
Package Type
See Table 2-1 for pin information.
8-lead SOIC
(Top View)
VIN 1
8 REF
CS1 2
GND 3
GATE 4
7 CS2
6 VDD
5 PWMD
2016 Microchip Technology Inc.
DS20005597A-page 1
1 page  
AT9933
ELECTRICAL CHARACTERISTICS (CONTINUED)
Electrical Specifications: Specifications are at TA = 25°C, VIN = Open and VDD = 7.5V unless otherwise noted.
Parameter
Sym.
Min. Typ. Max. Unit
Conditions
PWMD Pull-down Resistance
GATE DRIVER
RPWMD 50 100 150 kΩ VPWMD = 5V
GATE Short Circuit Current
ISOURCE 0.165
—
—
A VGATE = 0V
GATE Sinking Current
ISINK 0.165 — — A VGATE = VDD
GATE Output Rise Time
TRISE
— 30 50 ns CGATE = 500 pF
GATE Output Fall Time
TFALL
— 30 50 ns CGATE = 500 pF
INPUT CURRENT SENSE COMPARATOR
Voltage required to turn on GATE VTURNON1 85
100
115
mV
CS2 = 200 mV, CS1 increasing,
GATE goes LOW to HIGH (Note 1)
Voltage required to turn off GATE
Delay to Output (Turn-on)
VTURN-
OFF1
TD1,ON
–15
—
Delay to Output (Turn-off)
TD1,OFF
OUTPUT CURRENT SENSE COMPARATOR
—
0
15
mV
CS2 = 200 mV, CS1 decreasing,
GATE goes HIGH to LOW (Note 1)
150
250
ns
CS2 = 200 mV,
CS1 = 50 mV to +200 mV step
150
250
ns
CS2 = 200 mV,
CS1 = 50 mV to –100 mV step
Voltage required to turn on GATE VTURNON2 85
100
115
mV
CS1 = 200 mV, CS2 increasing,
GATE goes LOW to HIGH (Note 1)
Voltage required to turn off GATE
VTURN-
OFF2
–15
0
15
mV
CS1 = 200 mV, CS2 decreasing,
GATE goes HIGH to LOW (Note 1)
Delay to Output (Turn-on)
TD2,ON
—
150
250
ns
CS1 = 200 mV,
CS2 = 50 mV to +200 mV step
Delay to Output (Turn-off)
TD2,OFF
—
150
250
ns
CS1 = 200 mV,
CS2 = 50 mV to –100 mV step
Note 1: Specifications apply over the full operating ambient temperature range of –40ºC < TA < +125ºC.
2: Also limited by package power dissipation limit, whichever is lower
3: Depends on the current drawn by the part. See Section 4.0 “Application Information”
TEMPERATURE SPECIFICATIONS
Parameter
Sym.
Min. Typ. Max. Unit
TEMPERATURE RANGE
Operating Temperature
TA
Junction Temperature
TJ
Storage Temperature
TS
PACKAGE THERMAL RESISTANCE
–40 — +125
— — +150
–65 — +150
8-lead SOIC
JA — +101 —
Note 1: Mounted on a FR-4 board, 25 mm x 25 mm x 1.57 mm
°C
°C
°C
°C/W Note 1
Conditions
2016 Microchip Technology Inc.
DS20005597A-page 5
5 Page 
5.0 PACKAGING INFORMATION
5.1 Package Marking Information
AT9933
8-lead SOIC
XXXXXXXX
e3 YYWW
NNN
Example
AT9933LG
e3 1645
222
Legend:
XX...X
Y
YY
WW
NNN
e3
*
Product Code or Customer-specific information
Year code (last digit of calendar year)
Year code (last 2 digits of calendar year)
Week code (week of January 1 is week ‘01’)
Alphanumeric traceability code
Pb-free JEDEC® designator for Matte Tin (Sn)
This package is Pb-free. The Pb-free JEDEC designator (e3 )
can be found on the outer packaging for this package.
Note:
In the event the full Microchip part number cannot be marked on one line, it will
be carried over to the next line, thus limiting the number of available
characters for product code or customer-specific information. Package may or
not include the corporate logo.
2016 Microchip Technology Inc.
DS20005597A-page 11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet AT9933.PDF ] | |
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