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參數(shù)資料
| 型號： | LM2794 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Current Regulated Switched Capacitor LED Supply with Analog and PWM Brightness Control |
| 中文描述： | 電流調(diào)節(jié)開關(guān)電容LED電源與模擬和PWM亮度控制 |
| 文件頁數(shù)： | 4/16頁 |
| 文件大?。?/td> | 487K |
| 代理商： | LM2794 |
Electrical Characteristics
(Continued)
Limits in standard typeface are for T
= 25C and limits in
boldface type
apply over the full
Operating Junction Temperature
Range
(30C
≤
T
J
≤
+100C). Unless otherwise specified, C1 = C2 = C
IN
= C
HOLD
= 1 μF, V
IN
= 3.6V, BRGT pin = 0V; R
SET
=124
; LM2794:V
SD
= V
IN
(LM2795: V
SD
= 0V).
Symbol
Parameter
Conditions
f
SW
Switching Frequency (Note 6)
3.0V
≤
V
IN
≤
4.4V
Min
325
Typ
515
Max
675
Units
kHz
Note 1:
Absolute maximum ratings indicate limits beyond which damage to the device may occur. Electrical specifications do not apply when operating the device
beyond its rated operating conditions.
Note 2:
Internal thermal shutdown circuitry protects the device from permanent damage. Thermal shutdown engages at T
J
=150C (typ.) and disengages at
T
J
=140C (typ.). D1, D2, D3 and D4 may be shorted to GND without damage. P
OUT
may be shorted to GND for 1sec without damage.
Note 3:
The value of
θ
JA
is based on a two layer evaluation board with a dimension of 2in. x1.5in.
Note 4:
In the test circuit, all capacitors are 1.0μF, 0.3
maximum ESR capacitors. Capacitors with higher ESR will increase output resistance, reduce output
voltage and efficiency.
Note 5:
Voltage at which the device switches from charge-pump mode to pass mode or pass mode to charge-pump mode. For example, during pass mode the
device output (Pout) follows the input voltage.
Note 6:
The output switches operate at one eigth of the oscillator frequency, f
OSC
= 1/8f
SW
.
L
www.national.com
4
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