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參數(shù)資料
| 型號(hào)： | LTC4009IUF#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | BATTERY CHARGE CONTROLLER, 633 kHz SWITCHING FREQ-MAX, PQCC20 |
| 封裝： | 4 X 4 MM, 0.75 MM HEIGHT, LEAD FREE, PLASTIC, MO-220WGGD-1, QFN-20 |
| 文件頁數(shù)： | 14/28頁 |
| 文件大小： | 351K |
| 代理商： | LTC4009IUF#PBF |
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4009fd
LTC4009
LTC4009-1/LTC4009-2
TheLTC4009limitsmaximuminstantaneouspeakinductor
current during every PWM cycle. To avoid unstable switch
waveforms, the ripple current must satisfy:
I
mV
R
I
L
SENSE
MAX
<
2
150
–
so choose:
L
V
f
mV
R
I
CLP
PWM
SENSE
MAX
1
0 125
150
>
.
–
For C-grade parts, a reasonable starting point for setting
ripple current is ΔIL = 0.4 IMAX. For I-grade parts, use ΔIL
= 0.2 IMAX only if the IC will actually be used to charge
batteries over the wider I-grade temperature range. The
voltage compliance of internal LTC4009 circuits also im-
poses limits on ripple current. Select RIN (in Figure 1) to
avoid average current errors in high ripple designs. The
following equation can be used for guidance:
R
I
A
R
I
A
SENSE
L
IN
SENSE
L
50
20
≤
RIN should not be less than 2.37k or more than 6.04k. Val-
ues of RINgreaterthan3.01kmaycausesomereductionin
programmed current accuracy. Use these equations and
guidelines, as represented in Table 6, to help select the cor-
rect inductor value. This table was developed for C-grade
partstomaintainmaximumΔILnear0.6IMAXwithfPWMat
550kHz and VBAT = 0.5 VCLP (the point of maximum ΔIL),
assuming that inductor value could also vary by 25% at
IMAX. For I-grade parts, reduce maximum ΔIL to less than
0.4 IMAX, but only if the IC will actually be used to charge
batteries over the wider I-grade temperature range. In that
case, a good starting point can be found by multiplying
the inductor values shown in Table 6 by a factor of 1.6 and
roundinguptotheneareststandardvalue.
Table 6. Minimum Typical Inductor Values
VCLP
L1 (Typ)
IMAX
RSENSE
RIN
RPROG
<10V
≥10H
1A
100m
Ω
3.01k
26.7k
10V to 20V
≥20H
1A
100m
Ω
3.01k
26.7k
>20V
≥28H
1A
100m
Ω
3.01k
26.7k
<10V
≥5.1H
2A
50m
Ω
3.01k
26.7k
10V to 20V
≥10H
2A
50m
Ω
3.01k
26.7k
>20V
≥14H
2A
50m
Ω
3.01k
26.7k
To guarantee that a chosen inductor is optimized in any
given application, use the design equations provided and
perform bench evaluation in the target application, par-
ticularly at duty cycles below 20% or above 80% where
PWM frequency can be much less than the nominal value
of 550kHz.
TGATE BOOST Supply
Use the external components shown in Figure 11 to de-
velop a bootstrapped BOOST supply for the TGATE FET
driver. A good set of equations governing selection of the
two capacitors is:
C
Q
V
C
G
1
20
4 5
2 20 1
=
.
,
applicaTions inForMaTion
Figure 11. TGATE Boost Supply
20
17
BOOST
INTVDD
18
SW
LTC4009
4009 F11
C2
2F
C1
0.1F
L1
TO
RSENSE
D1
1N4148
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