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PDF BD9261EFV Data sheet ( Hoja de datos )
| Número de pieza | BD9261EFV | |
| Descripción | BD9261EFV / BD9261FP Technical Note | |
| Fabricantes | ROHM Semiconductor | |
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分发单位
青岛 IQC/JIT
黄岛 IQC/JIT
顺德 IQC/JIT
重庆 IQC/JIT
物流 JIT/IPC
零部件规格书
生效日期：2007.11.26
编号：
份数
零部件名称 G-IC-LEDDR-351-HSOP28-BD9261FP
专 用 号 0324402636
本体描述 BD9261FP
版本 A
1 生产厂家
厂家型号
页码
1 ROHM
BD9261FP
P1-P25
1 以下空白
1
1
确认参数(T=25℃)
参数
输入电压范围
LED 最大驱动电流
结温
封装
LED 通道数量
以下空白
数值
9～35
350
150
HSOP28
4
单位
V
mA
℃
/
/
参数
数值
单位
更改履历
序号
1 以下空白
更改内容
更改人
更改时间 版本
2
3
4
5
6
7
8
9
10
备注：
1．上表要保留此专用号的所有更改记录，便于查询；更改时要把需要更改的内容填完整。
2．此文件的所有技术规范均应符合海尔集团的最新技术标准要求；如有抵触，以集团标准为准。
编制
审核
标准化
会签
批准
徐艳艳
张永玲
孙佟佟
/
万秀水
以上所填、所签均经过确认，并明确表达了技术意图，不会造成歧义，并承担由此造成的损失！
1 page  
ROHM CO., LTD.
Special reference material
BD9261EFV BD9261FP Technical Note Ver.2.0
1.3 Electrical characteristics (unless otherwise specified, Ta = 25°C, VCC = 24V)
BD9261EFV/FP (1/2)
Item
[Whole device]
Symbol
Standard value
Minimum Standard Maximum
Unit
Condition
Operating circuit current
Icc － 6 12 mA VCC=24V, STB=3V, LED1-4 OFF
Stand-by circuit current
IST － 15 30 μA VCC=24V STB=0V
[VREF5V block]
VREF5V output voltage
VREF5 4.95 5.0 5.05 V IO=0mA
VREF5V Maximum output current
IREF5
15
－
- mA
[Switching block]
N terminal source resistance
RONH
0.5
1.0
2.0 μΩ ION=-10mA
N terminal sink resistance
RONL 0.5 1.0 2.0 Ω ION=10mA
[Over current protection (OCP) block]
Over current detection voltage
VOCP
350
400 450 mV
[Soft-start block]
SS terminal source current
ISS -4 -2 -1 μA
SS terminal release voltage
VSS
2.7 3.0 3.3 V SS=SWEEP UP
[Error amplifier block]
LED control voltage
VLED
0.55 0.6
0.65 V LED_VL=OPEN
OVP control voltage
OVP_FB
1.1
1.2
1.3 V LED_VL=OPEN,SS<2.7V
FB sink current
IFBSINK
40
100 200 μA VLED=1.2V, VFB=1.0V CP=GND
FB source current
IFBSOURCE
Upper resistance of divided LED_LV
terminal resistance
RupLED_LV
Lower resistance of dividedLED_LV
terminal resistance
RdownLED_LV
-200
72
18
-100
120
30
-40 μA VLED=0V, VFB=1.0V CP=GND
216 kΩ LED_LV=0V
54 kΩ LED_LV=3V
[CT oscillator block]
Oscillation frequency
FCT 558 600 642 KHz RT=100kΩ
N terminal MAX DUTY output NMAX_DUTY
78
85
95 % RT=100kΩ
RT terminal output voltage
VRT
1.05 1.5 1.95 V RT=100kΩ
SLOPE terminal output voltage VSLOPE
1.05
1.5
1.95 V SLOPE=100kΩ
[Over voltage protection (OVP) block
Over voltage protection detection voltage
VOVP
1.43
1.63
1.83 V VOVP SWEEP UP, LED_LV=OPEN
OVP sink current
I_OVP 1.5 3.0 6.0 μA OVP=2.0V
[Short circuit protection (SCP) block]
Short circuit protection detection voltage
[UVLO block]
VSCP
0.04 0.10 0.25 V VOVP SWEEP DOWN
Operation power source voltage (VCC) VUVLO_VCC
6.0
7.0
8.0 V VCC=SWEEP UP
VCC_UVLO hysteresis voltage VUHYS_VCC
150
300
600 mV VCC=SWEEP DOWN
UVLO terminal Pull-Down resistance R_UVLO
375
625
1125
kΩ UVLO=3V
UVLO Release voltage
UVLO Hysteresis voltage
VUVLO_U
VUHYS_U
2.4
50
2.55
100
2.7 V VUVLO=SWEEP UP
200 mV VUVLO=SWEEP DOWN
4/26
5 Page 
ROHM CO., LTD.
Special reference material
BD9261EFV BD9261FP Technical Note Ver.2.0
2 Understanding BD9261EFV・BD9261FP
2.1 Function of terminal
VREF5V (HTSSOP-B28:1PIN / HSOP28:22PIN)
5 V output terminal (TYP) used for DCDC converter driver, delivering 15 mA at maximum:
Use at a current higher than 15 mA may affect N terminal output pulse, which may result in malfunction. It will also
cause heating of IC itself. Therefore it is recommended to set the load as small as possible.
Install an oscillation prevention ceramic capacitor (1.0 uF-10 uF) nearest to VREF5V between VREF5V-AGND terminals.
N (HTSSOP-B28:2PIN / HSOP28:23PIN)
Gate drive output terminal of external NMOS of DC/DC converter with 0 – 5 V amplitudes:
Frequency can be set by a resistance connected to RT terminal. For details, see the explanation of <RT terminal>.
Gate drive signal output from N terminal becomes the source of noise, which may cause malfunction of IC due to
cross talk if placed by the side of an analog line. It is recommended to avoid placing the output line especially by
the side of CS, ISET, RT, OVP, LSP, LED_LV, FB, UVLO, etc. as far as possible when designing the board.
DCDC_GND (HTSSOP-B28:3PIN / HSOP28:24PIN)
Power GND terminal of output terminal, N Driver: it must be separated from AGND terminal and LED_GND terminal
on the board and a wire as thick as possible must be used to reduce impedance.
CS (HTSSOP-B28:4PIN / HSOP28:25PIN)
Inductor current detection resistance connecting terminal of DC/DC current mode: it transforms the current flowing
through the inductor into voltage by sense resistance RCS connected to CS terminal, and this voltage is compared
with that set in the error amplifier by current detection comparator to control DC/DC output voltage. RCS also
performs overvcurrent protection (OCP) and stops switching action when the voltage of CS terminal is 0.4 V (typ.) or
higher.
RCS resistance is affected by only a small wire resistance due to inductor current flowing through it. In
consideration of print layout wiring, the resistance value RCS becomes to be
(RCS+r1+r2), which is detected as overcurrent in some cases.
LX
r1,r2
CS terminal should be therefore connected directly with RCS to remove
the influence of r1. The influence of r2 can also be decreased by connecting
Layout
RCS to DCDC_GND with a wire as thick and short as possible.
In addition, placing a line which causes a noise like that of N terminal or LX
Wire
resistance
(beside NMOS-Drain) by the side of CS line may cause a noise on CS line,
which may be wrongly detected by OCP.It is therefore recommended to place
CS line apart from lines causing noise as far as possible and install a shield line if possible.
CP (HTSSOP-B28:4PIN／HSOP28:25PIN)
Terminal which sets the time from detection of abnormality until shutdown (Timer latch) : it performs constant current
charge of 2.0 uA to the capacitor externally connected with CP terminal and shuts down when it exceeds 2.0 V.
The external capacitor has an approximately 100 pF-1.0 uF capacitance.
CP charge time is set by the following equation:
TCP CCP 106[sec]
Here, Ccp = External capacitance of CP terminal [F]
Tcp = CP charge completion time
10/26
11 Page | ||
| Páginas | Total 27 Páginas | |
| PDF Descargar | [ Datasheet BD9261EFV.PDF ] | |
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