PJ9362 [ETC]
高效率电荷泵白光LED 驱动器; 高效率电荷泵白光LED驱动器型号: | PJ9362 |
厂家: | ETC |
描述: | 高效率电荷泵白光LED 驱动器 |
文件: | 总9页 (文件大小:337K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
高效率电荷泵白光LED 驱动器
PJ9362
高效率电荷泵白光LED驱动器
PJ9362
■ 产品概述
PJ9362 是一款白光LED 驱动器,可以驱动四颗白光LED,总电流可达120mA。PJ9362 采用高效率
电荷泵结构,能根据输入电压自适应调节,在×1,×1.5,×2 三种模式中自动切换,效率比普通电荷泵高
出20%,能达到90%以上。可以通过多种方式来调节LED 的电流,用户可以调节外接电阻来确定LED 的
最大电流,也能通过数字接口用PWM 信号来控制LED 亮灭,从而调节亮度(灰度)。四个LED 的电流做
了匹配,能保证每路之间亮度的均匀统一。
PJ9362 内置短路保护、温度保护,能确保在短路或大电流下,芯片不会烧坏。内置的软启电路能减少
启动时涌入电流对电源的影响。
PJ9362 产品体积小(采用QFN33-16 封装),外围电路简单(仅需要4 个电容1 个电阻),低功耗(关
断时静态电流小于1uA),适合于便携式移动设备使用。
■ 产品特点
效率高达90%
可驱动4 颗白光LED
可提供120mA 的输出电流
软启动功能
输出短路保护功能
自适应的三种电荷泵工作模式 ×1,×1.5,×2
250KHz/1MHz 两种工作频率可选
■ 应用范围
手机
白光LED 背光驱动器
(TOP-VIEW)
相机LED 闪光驱动器
■ 封装
WBFBP3X3-16L(QFN33-16)
WBFBP4X4-16L(QFN44-16)
15.24cm Wafer*
* 特殊需要请与我司市场部联系
■ 引脚排列
WBFBP3X3-16L 封装引脚排列如左图
WBFBP3X3-16L
高效率电荷泵白光LED 驱动器
PJ9362
■ 引脚定义
引脚编号
引脚名称 引脚功能定义
1
EN
芯片使能端,高电平有效,注意该引脚是高阻输入,不用时请通过电
阻连接到地。
2
3
4
5
CTRL0
CTRL1
AGND
ISET
输出控制位0(参考表2)
输出控制位1(参考表2)
模拟地
电流设置端。通过外接一个电阻到地来设置LED 的电流。ISET 典型
电压值为1.1v,切勿将此引脚短路
电压输出端,作为LED 的阳极电位
电源输入
6
VOUT
VIN
7
8
C1P
飞电容1 的正端
9
C1N
飞电容1 的负端
10
C2N
飞电容2 的负端
11
C2P
飞电容2 的正端
12
PGND
LED4~1
GND
电源地
13~16
底部
LED 的电流沉,不用时请连接到VOUT
封装底部的金属片应焊接到PCB,连接到GND
■ 功能框图
高效率电荷泵白光LED 驱动器
PJ9362
■ 绝对最大额定值
电压(TA=25℃)
VIN ………………………………………………………………………………………… -0.3v至6v
VOUT ………………………………………………………………………………………… -0.3v至6v
VCTRL/EN……………………………………………………………………………………… -0.3v至6v
电流(TA=25℃)
最大输出电流DC(Iout和D电流之和)………………………………………………………… 150mA
温度
PD WBFBP3X3-16L………………………………………………………………………………… 1.47 W
θJA……………………………………………………………………………………………… 68℃/W
工作温度 ………………………………………………………………………………… -40℃-125℃
贮存温度 ………………………………………………………………………………… -65℃-150℃
引脚温度(锡焊,10秒)……………………………………………………………………… 260℃
ESD抗静电
人体模型
机器模型
………………………………………………………………………………… 4 KV
………………………………………………………………………………… 400 V
■ 电气特性
(以下参数除非特别说明,都是在VIN=2.85 到5V,C1=C2=1 uF 陶瓷电容,温度25℃测得)
参数
符号
测试条件
最小值 典型值 最大值 单位
输入电源电压
欠压保护阈值电压
欠压保护迟滞电压
VIN
2.5
1.8
5.5
2.4
V
VIN 上升或下降
2.0
50
20
5
V
mV
mA
mA
mA
mA
uA
mA
mA
%
RSET=24.0K
流入 LED1 LED2
LED3 LED4 电流
RSET=91.0K
ILED
2.7V<VIN<5.5V
2
3
-
20
30
10
3.1V<VIN<5.5V
关断电流
静态电流
ISHDN
IQ
VIN=4.2V, EN=LOW
FOSC=1MHz,EN=HIGH, No Loda
FOSC=250KHz,EN=HIGH, No Load
2mA<ILED<30mA
1
3
1.5
2
LED 电流精度
ILED-ERR
7.5
5
电流匹配
ILED-LED-ERR
2mA<ILED<30mA
1
%
×1 到×1.5 模式切 VTRANS 1X
换电压(VIN 下降)
VLED=3.6V,IOUT=80mA,ILED1=ILED2
=ILED3=ILED4=20mA
VLED=3.6V,IOUT=80mA,ILED1=ILED2
=ILED3=ILED4=20mA
PJ9362
3.8
V
×1.5 到×2 模式切 VTRANS 1.5X
换电压(VIN 下降)
2.8
V
振荡频率
FOSC
0.8M
200K
1M
250K
5.5
1.2M
300K
6
Hz
Hz
V
PJ9362A
过压保护电压
温度保护阈值
温度保护迟滞
输入电流限制
VOVP
将设置为ON 的某个LED 开路
150
10
℃
℃
mA
ILIM
VOUT 短路到GND
450
850
高效率电荷泵白光LED 驱动器
PJ9362
■ 功能描述
PJ9362 是一款高效率电荷泵的白光LED 驱动器,它可以提供4 通道LED 电流源,具有低跌落电
压、亮度匹配的特点。之所以说PJ9362 效率高,是因为它具有×1、×1.5、×2 三种电荷泵模式,可
以自动根据负载和电源输入情况在这三种模式中切换。外接的RSET 电阻用来设置LED 的电流,也可
以通过 PWM 输入控制端来方便调节亮度。内建的电流预调整电路能减少对输入的纹波影响。内置的
软启电路能限制涌入电流,避免启动时涌入太大电流,从而减少对电源的影响。
模式判决:PJ9362 能自动判断并选择工作模式,它通过检测输出电压和 LED 电压自动升高或降
低工作模式,以达到最大效率。
灰度控制:CTRL0 和CTRL1 用来控制LED 开或关,控制表如下
控制输入
输出状态
LED3
OFF
CTRL1 CTRL0
LED1
ON
LED2
ON
LED4
OFF
OFF
ON
0
0
1
1
0
1
0
1
ON
ON
ON
ON
ON
ON
OFF
OFF
OFF
OFF
在控制端输入PWM 信号,可以通过占空比来调节LED 的亮度。
电流设置:LED 的最大电流是通过ISET 端外接到地的电阻RSET 来设定的。一般情况下LED 驱动
器的电流是流过 RSET 电阻的电流的 440 倍,因为电阻上的电流为 VISET÷RSET,而通常 ISET 的电压为
1.1v左右,所以LED 上的电流可以用下面的公式计算
⎛
⎞
VISET
484
⎜
⎜
⎟
⎟
ILED = 440×
=
RSET
RSET
⎝
⎠
温度保护:
■ 典型参数
■ 应用电路
高效率电荷泵白光LED 驱动器
PJ9362
高效率电荷泵白光LED 驱动器
PJ9362
■ 产品型号名构成
■ 封装尺寸
PJ9360, PJ9362
4 Channel 1×/1.5× Auto-Adjust
Charge Pump White LED Driver
GENERAL DESCRIPTION
The PJ9360/62 is a 4-channel 1x/1.5x auto-adjust charge pump white LED driver that achieves high efficiency for
Li-Ion battery supply. The LED current can be set by an external resistor. Only one small resistor and four 1µF small
ceramic capacitors are needed as external components to construct a LED driver, which makes the PJ9360/62 an ideal
choice for portable applications. The LED fault detection circuit in the PJ9360/62 improves the reliability of the system.
The PJ9360/62 has three dimming modes that allow users to adjust the brightness of the four LEDs individually or
all together. The first two dimming modes can be controlled through the EN/SET pin either by applying a serial digital
code, in which case the LED currents can be set with eight levels of up to 20mA, or by providing a
pulse-width-modulation (PWM) signal input. The third dimming mode relies on the feature that the four LEDs can be
turned on and off selectively by a three-bit digital code at the three control inputs in the PJ9360, or a two-bit digital code
at the two control inputs in the PJ9362. Therefore, individual dimming control can be realized by applying PWM signals
at those control inputs. The built-in soft-start circuit eliminates the inrush current during power on and 1x/1.5x mode
switching. Thermal shut down and current limiter prevent the PJ9360/62 from being damaged by high level current
through the device. The ultra small shutdown current of less than 1µA extends the battery life significantly. The
PJ9360/62 is available in a QFN-16 package.
FEATURES
APPLICATIONS
z
z
z
1×/1.5× auto-adjust charge pump
z
z
z
z
z
Cell Phones
LED current set by external resistor
Handheld Computers and PDAs
Digital Cameras
Programmable 4-channel LED current up to 20mA
with 8 levels control through en/set pin
z
Individual LED dimming control through PWM
signals at 3 (PJ9360) or 2 (PJ9362) control inputs
Small LCD Displays
Programmable current sink
z
z
z
z
LED fault detection
<3% channel to channel current mismatch
Less than 1uA shut down current
Built-in soft-start and soft mode switching
TYPICAL APPLICATIONS
BLOCK DIAGRAM
C1 1uF
C2 1uF
C2+ C2-
C1+ C1-
Vin
Vout
C1n C1p C2n C2p
Current
Charge
Switches
pump
3V to 5.5V
Cin 1uF
Vin
Vout
Cout
1uF
Led1
Digital
Interface
Current
Reference
PJ9360
LED1
LED2
LED3
LED4
+
+
PJ9362
Led2
Led3
Led4
En/Set
En/s
Ctrl0
Control
bit 0-2
Thermal
Shutdown
Soft
Start
Ctrl1
Iset
Ctrl2 (PJ9360)
Rset(24K)
N.C. (PJ9362)
Ctrl0
Ctrl1
Ctrl2
LED
control
Gnd
Page 1
PJ9360, PJ9362
4 Channel 1×/1.5× Auto-Adjust
Charge Pump White LED Driver
PACKAGES
PIN DESCRIPTIONS
Names
Pin No.
En/set
Description
Chip enable and programming pin
LED current control bit 0 to 1
LED current control bit 2 for PJ9360
Unconnected for PJ9362
QFN16(4X4mm)
1
2 to 3
4
Ctrl0 to 1
Ctrl2 (PJ9360)
N.C. (PJ9362)
Iset
LED4
13
8
7
6
5
C1p
Vin
5
LED currents pre-set Pin
Output voltage source
6
Vout
LED3 14
PJ9360
7
Vin
Power supply
15
16
LED2
LED1
Vout
Iset
PJ9362
8
9
C1p
Positive terminal of fly capacitor 1
Negative terminal of fly capacitor 1
Negative terminal of fly capacitor 2
Positive terminal of fly capacitor 2
Ground
C1n
10
C2n
11
C2p
12
Gnd
13 to 16
LED1 to 4
Current sink for LED
ELECTRICAL CHARACTERISTICS
VDD=3.5V, , C1=C2=Cin=Cout=1µF, TA=25℃, unless specified otherwise.
SYMBOL
ITEMS
CONDITIONS
Min.
Typ.
Max.
UNIT
Input Characteristics
VIN
Input Voltage
3
5.5
1
V
IOFF
Operating Current(Shutdown)
Operating Current(Quiescent)
Over Load Protection
En/Set=0
0.1
1.5
600
µA
mA
mA
Iq
No load Current
Short vout to gnd
3
IOLP
Charge Pump
FCLK
Switching Frequency
0.6
1
1.4
MHz
TSS
Soft-start time
550
4
µs
V
V15-1
V1-15
The Threshold of 1.5X-> 1X
The Threshold of 1X-> 1.5X
VLED1=VLED2=3.5V, ILED=25mA
VLED1=VLED2=3.5V, ILED=25mA
3.8
V
Output Characteristics
IOUT Maximum LED output current
3.0<vin<5.5, VLED=3.5V, en/set set the
output to maximum current, and
Rset=24KΩ
18
20
22
3
mA
(note1)
IMatch
Current match between D1, D2, D3 and D4
Over output voltage protection
3.0<vin<5.5, output maximum current
Vin=4, Open all led
%
V
Vovp
Chip Enable
VIL
5.5
En/Set, Ctrl0,Ctrl1, Ctrl2 Maximum Low Level
Threshold
Vin=5
1.4
1
V
VIH
II
En/Set, Ctrl0 to 2 Minimum high level threshold
En/Set, Ctrl0,Ctrl1, Ctrl2 Input Current
Ctrl0 to 2 minimum pulse width when dimming
with PWM signal
Vin=5
1.8
-1
V
uA
us
Vin=Ven/set=VCtrl0=VCtrl1=VCtrl2=5V
Tctrl
100
50
TsetL
TsetH
En/Set low level width
0.3
75
us
ns
us
En/Set high level width
Toff
En/Set shut down low level width
500
Thermal
TSD
THY
Thermal Shut Down Threshold
Thermal Shut Down Hysteresis
Temperature rise
150
160
10
170
oC
oC
Note1: IMatch=|ΔILEDmax/ILEDavg |×100%
Page 2
PJ9360, PJ9362
4 Channel 1×/1.5× Auto-Adjust
Charge Pump White LED Driver
PACKAGE INFORMATION
QFN16:
Page 3
相关型号:
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