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PDF AAT3193 Data sheet ( Hoja de datos )
| Número de pieza | AAT3193 | |
| Descripción | (AAT3192 / AAT3193) 2-/3-Channel Charge-Pump LED Drivers | |
| Fabricantes | AAT | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AAT3193 (archivo pdf) en la parte inferior de esta página. Total 17 Páginas | ||
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General Description
The AAT3192 and AAT3193 are charge-pump
based, current-sink white LED drivers capable of
driving one to three LEDs up to 30mA, each. They
automatically switch between 1x mode and 2x
mode to maintain the highest efficiency and opti-
mal LED current accuracy and matching.
The AAT3192/93 charge pump’s 1x mode (bypass
mode) has very low resistance allowing LED cur-
rent regulation to be maintained with input supply
voltage approaching the LED forward voltage.
The AAT3192 and the AAT3193 are available in a
2x2mm 10-lead SC70JW-10 packages.
AAT3192/93
Low-Cost, 2-/3-Channel
Charge-Pump LED Drivers
Features
ChargePump™
• Drives up to 3 LEDs at up to 30mA, each
• Automatic Switching Between 1x and 2x Modes
• 0.9MHz Switching Frequency
• Linear LED Output Current Control
— Single-wire, S2Cwire Interface
• AAT3192/93-1: 16-step
• AAT3192/93-2: 8-step
• AAT3192/93-3: 4-step
— ON/OFF or PWM Interface
• AAT3192/93-4
• ±10% LED Output Current Accuracy
• ±3% LED Output Current Matching
• Low-current Shutdown Mode
• Built-in Thermal Protection
• Automatic Soft-start
• Available in 2x2mm SC70JW-10 Package
www.DataSheet4U.com
Typical Application
Applications
• Low-cost Cordless Phone Handsets
• Low-cost Digital Cameras
• Low-cost Mobile Phone Handsets
• Low-cost MP3 and PMP Players
Input Voltage
2.7V to 5.5V
CIN
1μF
EN/SET
S2Cwire
Interface
CP
1μF
RSET
14.3kΩ
IN
OUT
C+
AAT 3192- 1
C-
EN/SET
RSET
GND
D1
D2
C OUT
1μF
Input Voltage
2.7V to 5.5V
WLEDs
OSRAM LW M 678
or equivalent
C IN
1μF
EN/SET
S2Cwire
Interface
CP
1μF
R SET
14.3kΩ
IN
C+ OUT
AAT 3193 -1
C-
EN/SET
D1
D2
RSET
D3
GND
COUT
1μF
WLEDs
OSRAM LW M 678
or equivalent
3193.2007.05.1.0
1
1 page  
AAT3192/93
Low-Cost, 2-/3-Channel
Charge-Pump LED Drivers
Electrical Characteristics1
IN = EN = 3.6V; CIN = 1µF; COUT = 1µF; CCP = 1µF; RSET = 14.3kΩ; TA =-40°C to 85°C unless otherwise noted.
Typical values are at TA = 25°C.
Symbol Description
AAT3192/93-3: LED Current Sink Outputs
ID_(MAX) D1 - D3 Current Accuracy
ΔID_(MAX) D1 - D3 Current Matching
ID_(DATA4) D1 - D3 Current Accuracy
VD_(TH)
D1- D3 Charge Pump Mode
Transition Threshold
AAT3192/93-1/-2/-3: EN/SET and S2Cwire Control
VENH
EN Input High Threshold Voltage
VENL
EN Input Low Threshold Voltage
IEN(LKG) EN Input Leakage Current
tEN/SET(OFF) EN/SET Input OFF Timeout
tEN/SET(LAT) EN/SET Input Latch Timeout
tEN/SET(LOW) EN/SET Input LOW Time
tENSET(H-MIN) EN/SET Minimum High Time
tENSET(H-MAX) EN/SET Maximum High Time
AAT3192/93-4: EN/PWM Current Control
VENH
VENL
IEN(LKG)
tPWM(ON)
tEN/PWM
fPWM
EN/PWM Input High Threshold Voltage
EN/PWM Input Low Threshold Voltage
EN/PWM Input Leakage Current
PWM Control Turn-on Delay
EN/PWM Input OFF Timeout
PWM Control Frequency
Conditions
RSET = 10.7kΩ; DATA = 1;
VIN - VF = 1.5V
RSET = 10.7 kΩ; DATA = 1;
VIN - VF = 1.5V
RSET = 10.7kΩ; DATA = 4;
VIN - VF = 1.5V
RSET = 10.7kΩ;
ID1 = ID2 = ID3 = 20mA
EN/SET = IN = 5V
EN/PWM = IN = 5V
Duty Cycle = 80%
Min Typ Max Units
17.6 19.6 21.6 mA
±3 %
0.72 0.9 1.1 mA
150 mV
1.4 V
0.4 V
-1 1 μA
500 µs
500 µs
0.3 75 µs
50 ns
75 µs
1.4 V
0.4 V
-1 1 μA
2 µs
0.15 1 ms
50 kHz
1. The AAT3192/93 are guaranteed to meet performance specification over the -40°C to 85°C operating temperature range and are
assured by design, characterization and correlation with statistical process controls.
3193.2007.05.1.0
5
5 Page 
Data
1
2
3
4
5
6
7
8
EN Rising
Edges
1
2
3
4
5
6
7
8
D1-D3
Current (mA)
20
17.3
14.7
12
9.3
6.7
4
1.3
Table 2: AAT3192/93-2 LED Current Settings
AAT3192/93
Low-Cost, 2-/3-Channel
Charge-Pump LED Drivers
20.00
15.00
10.00
5.00
0.00
1
23456
S2Cwire Interface Data Code
7
8
Figure 3: AAT3192/93-2 Current Control Profile
Data
EN Rising
Edges
D1-D3
Current (mA)
11
20
2 2 13.3
3 3 6.7
4 4 0.87
Table 3: AAT3192/93-3 LED Current Settings
PWM Control (AAT3192/93-4 only)
PWM (Pulse Width Modulation) is an industry stan-
dard technique of controlling LED brightness by
modulating the conduction duty cycle of the LED
current. LED brightness is determined by the aver-
age value of the PWM signal multiplied by the LED’s
intensity where intensity is proportional to the LED
drive current. A PWM control signal can be applied
into the EN/PWM pin of the AAT3192/93-4. By
20.00
15.00
10.00
5.00
0.00
1
23
S2Cwire Interface Data Code
4
Figure 4: AAT3192/93-3 Current Control Profile
changing the duty cycle of the PWM signal from
100% (logic high) to 10%, LEDs sink current can be
programmed from 20mA to 2.4mA. To save power
when not used, AAT3192/93-4 can be shutdown by
holding the EN/PWM pin low for 1ms.
Lastly, Table 4 and Figure 5 illustrate the
AAT3192/93-4’s LED current control profile as a
function of a PWM control signal.
3193.2007.05.1.0
11
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet AAT3193.PDF ] | |
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