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參數(shù)資料
| 型號(hào)： | NCP5604A |
| 廠商： | ON SEMICONDUCTOR |
| 英文描述： | High Efficiency White LED Driver(高效白色LED驅(qū)動(dòng)器) |
| 中文描述： | 高效率白光LED驅(qū)動(dòng)器（高效白色發(fā)光二極管驅(qū)動(dòng)器） |
| 文件頁(yè)數(shù)： | 8/15頁(yè) |
| 文件大?。?/td> | 359K |
| 代理商： | NCP5604A |
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NCP5604A, NCP5604B
http://onsemi.com
8
ANALOG SECTION
(Typical values are referenced to T
A
= +25
°
C, Min & Max values are referenced 40
°
C to +85
°
C ambient
temperature, operating conditions 2.85 V < Vbat < 5.5 V, unless otherwise noted.)
Pin
Symbol
Rating
Min
Typ
Max
Unit
3
I
REF
Reference Current @ Vref = 600 mV (Note 11)
1.0
100
A
3
V
REF
Reference Voltage (Note 12)
2%
600
+2%
mV
I
LEDR
Reference Current (IREF) to Output LED Current Ratio
260
11.The overall output current tolerance depends upon the accuracy of the external resistor. Using 1% or better resistor is recommended.
12.The external circuit must not force the I
REF
pin voltage either higher or lower than the 600 mV specified.
DIGITAL PARAMETERS SECTION
(Typical values are referenced to T
A
= +25
°
C, Min & Max values are referenced 40
°
C to +85
°
C
ambient temperature, operating conditions 2.85 V < Vbat < 5.5 V, unless otherwise noted.) Note: Digital inputs undershoot < 0.30 V to
ground, Digital inputs overshoot < 0.30 V to V
BAT
.
Pin
Symbol
Rating
Min
Typ
Max
Unit
2
F
PWM
Input Enable PWM
0.1
200
kHz
2
V
IH
Positive Going Input High Voltage Threshold, EN Signal
1.3
V
BAT
V
2
V
IL
Negative Going Input High Voltage Threshold, EN Signal
0
0.4
V
APPLICATIONS INFORMATION
DCDC OPERATION
The converter is based on a charge pump technique to
generate a DC voltage capable to supply the White LED
load The system regulates the current flowing into each
LED by means of internal current mirrors associated with
the white diodes. Consequently, the output voltage will be
equal to the Vf of the LED, plus the 300 mV (typical)
developed across the internal NMOS mirror. Typically,
assuming a standard white LED forward biased at 10 mA,
the output voltage will be 3.8 V.
The third external capacitor makes possible the 1.33X
extra mode of operation, with a significant efficiency
improvement of the converter over the normal battery
voltage span. The threshold levels have been defined to
optimize this range of operating voltage, assuming a high
efficiency is not relevant when the system is connected to
a battery charger ( i.e. Vbat > 4.5 V).
The builtin OVP circuit continuously monitor each
output and stops the converter when the voltage is above
5.0 V. The converter resumes to normal operation when the
voltage drops below 5.0 V (no latchup mechanism).
Consequently, the chip can operate with no load during any
test procedures, but in the case of special applications, it is
recommended to connect the non used LED driver either to
a LED, or to the Vbat supply to minimize the internal losses
(see LOAD CONNECTION paragraph).
LOAD CURRENT CALCULATION
The load current is derived from the 600 mV reference
voltage provided by the internal Band Gap associated to the
external resistor connected across I
REF
pin and Ground (see
Figure 4). In any case, no voltage shall be forced at I
REF
pin, either downward or upward.
The reference current is multiplied by the constant
k = 260 to yield the output load current. Since the reference
voltage is based on a temperature compensated Band Gap
structure, a tight tolerance resistor will provide a very
accurate load current. The resistor is calculated from the
Ohm’s law (R
bias
= Vref/I
REF
) and a more practical
equation can be arranged to define the resistor value for a
given output current:
Rbias
(Vref *k) Iout
Rbias
(0.6 *260) Iout
(eq. 1)
Rbias
156 Iout
(eq. 2)
Consequently, the resistor value will range between
R
bias
= 156/25 mA = 6240 and R
bias
= 156/0.5 mA =
312 k . Obviously, the tolerance of such a resistor must be
1% or better, with a 100 ppm thermal coefficient, to get the
expected overall tolerance.
VBandGap
Pin 5 to 8
+
600mV
Pin 3
GND
I
REF
Figure 4. Basic Reference Current Source
Note: The I
REF
pin must never be biased
to voltage higher than 600 mV.
GND
LED Return
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| NCP5604B | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:High Efficiency White LED Driver |
| NCP5604BMTR2G | 功能描述:LED照明驅(qū)動(dòng)器 ANA LED DRIVER RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N |
| NCP5604D WAF | 制造商:ON Semiconductor 功能描述: |
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