BD6155FVM-TR Rohm Semiconductor, BD6155FVM-TR Datasheet - Page 5

• Manufacturer Part Number: BD6155FVM-TR
• Description: IC LED DRIVER DC/DC CONV 8MSOP
• Manufacturer: Rohm Semiconductor

Specifications of BD6155FVM-TR

• Constant Current: Yes
• Topology: Switched Capacitor (Charge Pump)
• Number Of Outputs: 1
• Internal Driver: Yes
• Type - Primary: Backlight
• Type - Secondary: White LED
• Frequency: 120kHz
• Voltage - Supply: 2.9 V ~ 5.5 V
• Voltage - Output: 5.6V
• Mounting Type: Surface Mount
• Package / Case: 8-MSOP
• Operating Temperature: -25°C ~ 75°C
• Current - Output / Channel: 80mA
• Internal Switch(s): *
• Efficiency: *
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Communication ICs
! ! ! ! Design information
1. The maximum of power loss of this IC is controlled by the output transistor M1 in regulator driver.
2) Power supply voltage
Relations of the power supply voltage are signified in 2 expressions with this loss.
The loss in M1,
∆V ; The voltage between LED-LEDS
VF1 ; Shotky’s Di VF
VF2 ; LED’s VF
V
VLED ; The voltage across RSENSE (examples at 205mV calculation)
ILED ; Drive current.
The thermal shutdown circuit turn on, and output electric current declines when chip temperature is about 125 degrees
due to low electric current driver.
OUT
∆V = V
∆V × ILED = ILED × {2VBAT− (2VF1 + VF2 + ILED × R1 + VLED)}
; Charge pump output voltage (Fig.2)
OUT
− (VF2 + ILED × R1 + VLED)
300
200
100
0
Room temperature power dissipation
(350mW)
2
V
BAT
Pd-V
VF1
BAT
3
Power supply voltage V
VF1
M1
ILED
VF2
4
0.2V
BAT
LED
LED
LEDS
RSENS
R1
V
(V)
OUT
5
I
I
O
O
∆V
=50mA
=80mA
(2 expressions)
6
VF1=0.5V
VF2=3.4V
R1=0Ω
BD6155FVM
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