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参数资料
| 型号： | LT1932ES6#TRM |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 0.78 A SWITCHING REGULATOR, 1600 kHz SWITCHING FREQ-MAX, PDSO6 |
| 封装： | PLASTIC, SOT-23, 6 PIN |
| 文件页数： | 11/16页 |
| 文件大小： | 235K |
| 代理商： | LT1932ES6#TRM |
4
LT1932
BLOCK DIAGRA
W
–
+
1
3
Σ
×5
1.2MHz
OSCILLATOR
DRIVER
S
Q
R
–
+
A2
–
+
A1
0.04
+
Q1
Q2
LED
SW
D1
6
VIN
L1
5
SHDN
C1
C2
VOUT
VIN
DRIVER
LED CURRENT
REFERENCE
ILED
4
RSET
1932 F01
RSET
ISET
2
GND
Figure 1. LT1932 Block Diagram
OPERATIO
U
The LT1932 uses a constant frequency, current mode
control scheme to regulate the output current, ILED.
Operation can be best understood by referring to the
block diagram in Figure 1. At the start of each oscillator
cycle, the SR latch is set, turning on power switch Q1. The
signal at the noninverting input of the PWM comparator
A2 is proportional to the switch current, summed to-
gether with a portion of the oscillator ramp. When this
signal reaches the level set by the output of error amplifier
A1, comparator A2 resets the latch and turns off the
power switch. In this manner, A1 sets the correct peak
current level to keep the LED current in regulation. If A1’s
output increases, more current is delivered to the output;
if it decreases, less current is delivered. A1 senses the
LED current in switch Q2 and compares it to the current
reference, which is programmed using resistor RSET. The
RSET pin is regulated to 100mV and the output current,
ILED, is regulated to 225 ISET. Pulling the RSET pin higher
than 100mV will pull down the output of A1, turning off
power switch Q1 and LED switch Q2.
UU
U
PI FU CTIO S
SW (Pin 1): Switch Pin. This is the collector of the internal
NPN power switch. Minimize the metal trace area con-
nected to this pin to minimize EMI.
GND (Pin 2): Ground Pin. Tie this pin directly to local
ground plane.
LED (Pin 3): LED Pin. This is the collector of the internal
NPN LED switch. Connect the cathode of the bottom LED
to this pin.
RSET (Pin 4): A resistor between this pin and ground
programs the LED current (that flows into the LED pin).
This pin is also used to provide LED dimming.
SHDN (Pin 5): Shutdown Pin. Tie this pin higher than
0.85V to turn on the LT1932; tie below 0.25V to turn it off.
VIN (Pin 6): Input Supply Pin. Bypass this pin with a
capacitor to ground as close to the device as possible.
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相关代理商/技术参数 |
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| LT1932ES6TRMPBF | 制造商:Linear Technology 功能描述:LED Driver 8-Seg 1.8/2.5/3.3/5/9V TSOT23 |
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| LT1933ES6#PBF | 制造商:Linear Technology 功能描述:IC STEP-DOWN REGULATOR 6-TSOT-23 |
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