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参数资料
| 型号： | BD9206EFV-E2 |
| 厂商： | Rohm Semiconductor |
| 文件页数： | 8/18页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVER 6V LCD 20HTSSOP |
| 标准包装： | 1 |
| 恒定电流： | 是 |
| 恒定电压： | 是 |
| 拓扑： | PWM |
| 输出数： | 6 |
| 内部驱动器： | 无 |
| 类型 - 主要： | 背光 |
| 类型 - 次要： | 白色 LED |
| 电源电压： | 8 V ~ 30 V |
| 输出电压： | 5V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-VSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 20-HTSSOP |
| 包装： | 标准包装 |
| 工作温度： | -40°C ~ 85°C |
| 其它名称： | BD9206EFV-E2DKR |
BD9206EFV
Datasheet
● Block functional descriptions
■ PREREG, REF, 5VREG
PREREG is an circuit of constant voltage supplied to REF and 5VREG in which the voltage applied to VCC terminal is
made to be constant.
REF is a temperature-compensated reference voltage resource and used as reference voltage of TSD (Thermal
Shutdown Circuit).
5VREG is a 5V constant-voltage source and used as a power supply of constant-current driver.
The 5V constant voltage is output to VREG terminal. Moreover, it is recommended to attach a 1 μ F ceramic capacitor
using for phase correction, to VREG terminal.
■ UVLO （ Under Voltage Lock Out ）
The LED driver is turned OFF when the VREG voltage is less than 2.9V(typ). The operation of lighting up is reset when
VREG becomes more than 3.0V(typ).
■ TSD （ Thermal Shutdown Circuit ）
TSD circuit protects the IC from thermo runaway or thermal damage.
TSD circuit detects the chip temperature and turns the circuit off if the chip temperature reaches 175 ℃ . The hysteresis of
20 ℃ is set for TSD detection and release so as to prevent malfunction caused by temperature fluctuations.
■ Current Driver （ Constant-current driver ） , Driver Current Setting
Current Driver(Constant-current driver) is an circuit that generates a constant current for lighting of LED.
Constant-current circuit of BD9206EFV consists of the constant current setting part and the constant current driver part.
The constant-current driver part operates in such a manner that the voltage of Point a is equal to the voltage of point b
because the part serves as a buffer, the input of which is the voltage VX that is set by the constant current setting part.
Therefore, the current ILED that flows into the VLED terminal is as follows:
ILED =
Vb/RSET =
Va/RSET = VX/RSET = VSET*A/RSET = VSET*B
（ A and B are numerical constants ）
For BD9206EFV, the numerical constants inside the IC are set in such a way that the following formula is brought into
existence:
ILED(mA) = VSET ＊ 10
(VSET=0.6 ～ 3.0V)
If VSET is fixed, then the Vb is fixed, therefore the current ILED always flows independent of the fixed voltage of VLED.
However, the constant current operation is stopped if the voltage of VLED terminal is less than 0.6V, so please ensure
VLED>0.6V.
Vo
compensation 償 用 コ ン デ ン サ
定 電 流 設 定 部
[ Constant 【 current setting part] 】
【 定 電 流 ド ラ バ
[ Constant current driver イ part] 部 】
Condenser for phase
位相補
IL E D
VX=VSET*A
a
+
-
VLED
b
VSET
電圧
Voltage
shift circuit
変換
回路
VX
EN
RSET
Figure 16
www.rohm.com
? 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111 ? 15 ? 001
8/15
TSZ02201-0F1F0C100070-1-2
20.Sep.2012 Rev.001
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