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參數(shù)資料
| 型號(hào)： | LT3467A |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 1A Low Noise High Current LED Charge Pump with Independent Torch/Flash Current Control |
| 中文描述： | 第1A低噪聲大電流LED的獨(dú)立火炬電荷泵/閃光電流控制 |
| 文件頁(yè)數(shù)： | 5/12頁(yè) |
| 文件大?。?/td> | 102K |
| 代理商： | LT3467A |
LTC 3216
5
3216fa
PU
C2
+
, C1
+
, C2
–
, C1
–
(Pins 1, 2, 10, 12):
Charge Pump
Flying Capacitor Pins. A 2.2
μ
F X5R or X7R ceramic
capacitor should be connected from C1
+
to C1
–
and from
C2
+
to C2
–
.
CPO (Pin 3):
Output. CPO is the output of the Charge
Pump. This pin may be enabled or disabled using the EN1
and EN2 inputs. A 4.7
μ
F X5R or X7R ceramic capacitor is
required from CPO to GND.
I
SET1
/I
SET2
(Pins 4, 6):
LED Current Programming Resis-
tor Pins. The I
SET1
and I
SET2
pins will servo to 1.22V.
Resistors connected between each of these pins and GND
are used to set the high and low LED current levels.
Connecting a resistor of 2k
or less will cause the
LTC3216 to enter overcurrent shutdown mode.
I
LED
(Pin 5):
Output. I
LED
is the LED current source output.
The LED is connected between CPO (anode) and I
LED
(cathode). The current into the I
LED
pin is set via the EN1
and EN2 inputs, and the programming resistors con-
nected from I
SET2
and I
SET1
to GND.
EN1/EN2 (Pins 7, 8):
Inputs. The EN1 and EN2 pins are
used to select which current level is being supplied to the
LED, as well as to put the part into shutdown mode. The
truth table for these pins is as follows:
Truth Table
EN1
0
1
0
1
EN2
0
0
1
1
MODE
Shutdown
Low Current
High Current
Low + High Current
V
IN
(Pin 9):
Power. Supply voltage for the LTC3216. V
IN
should be bypassed with a 2.2
μ
F or greater low impedance
ceramic capacitor to GND.
GND (Pin 11):
Charge Pump Ground. This pin should be
connected directly to a low impedance ground plane.
EXPOSED PAD (Pin 13):
Control Signal Ground. This pad
must be soldered to a low impedance ground plane for
optimum thermal and electrical performance.
BLOCK DIAGRA
2
3
5
13
GND
11
GND
12
4
6
–
+
1
10
1X MODE: CPO = V
1.5X MODE: CPO = 4.6V
2X MODE: CPO = 5.1V
V
REF
DROPOUT
DETECTOR
CURRENT
SOURCE
CONTROL
CONTROL
LOGIC
MODE
CONTROL
OSCILLATOR
8
9
7
CPO
I
LED
I
SET2
I
SET1
V
IN
EN1
EN2
C1
+
C1
–
C2
+
C2
–
3216 BD
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