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参数资料
| 型号： | NCP5604BMTR2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 8/15页 |
| 文件大小： | 0K |
| 描述： | IC DRIVER LED WHITE HE 16-WQFN |
| 产品变化通告： | Product Obsolescence 30/Jun/2011 |
| 标准包装： | 1 |
| 拓扑： | PWM，切换式电容器（充电泵） |
| 输出数： | 4 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光，闪灯/白光 |
| 类型 - 次要： | 白色 LED |
| 频率： | 850kHz ~ 1.15MHz |
| 电源电压： | 2.7 V ~ 5.5 V |
| 输出电压： | 4.8 V ~ 6 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-WFQFN 裸露焊盘 |
| 供应商设备封装： | 16-QFN（3x3） |
| 包装： | 剪切带 (CT) |
| 工作温度： | -40°C ~ 85°C |
| 其它名称： | NCP5604BMTR2GOSCT |
NCP5604A, NCP5604B
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
3
3
-
Symbol
I REF
V REF
I LEDR
Rating
Reference Current @ Vref = 600 mV (Note 11)
Reference Voltage (Note 12)
Reference Current (IREF) to Output LED Current Ratio
Min
1.0
-2%
-
Typ
-
600
260
Max
100
+2%
-
Unit
m A
mV
-
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
2
2
2
Symbol
F PWM
V IH
V IL
Rating
Input Enable PWM
Positive Going Input High Voltage Threshold, EN Signal
Negative Going Input High Voltage Threshold, EN Signal
Min
0.1
1.3
0
Typ
-
-
-
Max
200
V BAT
0.4
Unit
kHz
V
V
APPLICATIONS INFORMATION
DC-DC 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
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:
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.
Rbias + (Vref * k) Iout
Rbias + (0.6 * 260) Iout
Rbias + 156 Iout
(eq. 1)
(eq. 2)
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 built-in 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 latch-up mechanism).
Consequently, the chip can operate with no load during any
test procedures, but in the case of special applications, it is
Consequently, the resistor value will range between
R bias = 156/25 mA = 6240 W and R bias = 156/0.5 mA =
312 k W . 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
LED Return
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).
+
-
600mV
Pin 5 to 8
LOAD CURRENT CALCULATION
The load current is derived from the 600 mV reference
voltage provided by the internal Band Gap associated to the
I REF
Pin 3
GND
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
GND
Note: The I REF pin must never be biased
to voltage higher than 600 mV.
Figure 4. Basic Reference Current Source
k = 260 to yield the output load current. Since the reference
http://onsemi.com
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