STBB3JCC Datasheet, PDF (18/27 Pages) STMicroelectronics – 2 A, high efficiency single inductor buck-boost DC-DC converter and high brightness WLED driver

Application information
STBB3JCC
Equation 2
R_sense = R2 = _I-^V-_L---^FE----^BD-- = ¹----⁰--₁-⁰---_A-^m-----^v-- = 0.1Ω
P_{Diss_RSENSE} = R2 ⋅ I_LED = 0.1 ⋅ 1² = 0.1W
Figure 31. Application schematic HB WLED driver
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Table 8. List of external components⁽¹⁾
Component
Manufacturer
Part number
Value
C1, C2
Murata
GRM188R60J106ME84
10 μF
C6
Murata
GRM31CB31E226KE15
22 μF
C5
TDK
C1608X7R1H225K
2.2 μF
L1
R1⁽²⁾
TDK
Coilcraft
VLF403215MT-1R5N
XFL4020-152MEB
Standard resistor
1.5 μH
4.7 K
R3
D1⁽²⁾
R2⁽³⁾
Standard resistor
Zener diode
Standard resistor
from 47 to 100 Ω
4.7 V 1/4 W
0.1 Ω 1/4 W
LED
White LED
3.7 V_F I_LED=1 A
1. Above listed components refer to typical application. Operation of the STBB3JCC is not limited to the
choice of these external components.
2. R1 and D1 are used as V_OUT overvoltage protection in case of open-LED failure (these components are
optional and they are not mounted on the evaluation board).
3. R2 is calculated according to the following formula: _{R2 = I-}^V_-L---FE_----BD_{-- =} 1_----0I_--L-0_--E--m_--D---V_---
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