Texas Instruments TPS65820 Evaluation Module TPS65820EVM TPS65820EVM Datenbogen
Produktcode
TPS65820EVM
ELECTRICAL CHARACTERISTICS – LED AND PWM DRIVERS
Current range, Vin = 3.3 V,
I
O(SM3)
+
V(SM3REF)
R
FB3
SLVS663B – MAY 2006 – REVISED APRIL 2008
..............................................................................................................................................................
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ELECTRICAL CHARACTERISTICS – ADC (continued)
Over recommended operating conditions (typical values at T
J
= 25
°
C), V(ADC_REF) =2.535v if external reference voltage is
used,application circuit as in
(unless otherwise noted).
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
INTERNAL REFERENCE POWER CONSUMPTION
PD
ACTIVE
Power dissipation
Conversion active
2.3
mW
PD
ARMED
Power dissipation
Not converting
0.43
mW
TRIGGER TIMING CHARACTERISTICS
t
DELAY(TRG)
Trigger delay time accuracy
Time range, set via I
2
C register ADC_DELAY
0
750
uS
Relative to typical value set via I
2
C
–20%
20%
t
WAIT(TRG)
Trigger wait time accuracy
Time range, set via I
2
C register ADC_WAIT
0
20.48
mS
Relative to typical value set via I
2
C
–20%
20%
Over recommended operating conditions (typical values at T
J
= 25
°
C), application circuit as in
(unless otherwise
noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
SM3 BOOST CONVERTER, WHITE LED CONSTANT CURRENT DRIVER
V
VIN(SM3)
Input Voltage range
V(OUT) = 3.3 V
3
4.7
V
V
OVP3
Output overvoltage trip
OVP detected at V(SM3) > V
OVP3
26.5
29
30
V
V
HYS(OVP3)
Output overvoltage hysteresis
OVP not detected at V(SM3) < V
OVP3
– V
HYS(OVP3)
1.8
V
LED current below regulation point at
V
SM3REF
LED current sense threshold
244
252
260
mV
V(FB3) < V
SM3REF
0
25
mA
I
O(SM3)
LED current
Total accuracy, I
O(SM3)
= 10 mA
–10%
10%
D
SM3SW
= 0% to 99.6%, set
D
SM3SW
LED switch duty cycle
Duty cycle range
via I
2
C, 256 steps 0.4%
minimum step
SM3_LF_OSC = 0
122
LED switch duty cycle pattern
256 pulses within repetition
F
REP_SM3
Hz
repetition rate
rate time
SM3_LF_OSC = 1
183
R
DSON(SM3SW
LED switch MOSFET
V(OUT) = 3.6 V; I(SM3SW) = 20 mA
1
2
Ω
)
on-resistance
I
LKG(SM3SW)
LED switch MOSFET leakage
1
µ
A
Power stage MOSFET
R
DSON(L3)
V(OUT) = 3.6 V; I(L3) = 200 mA
300
600
m
Ω
on-resistance
I
LKG(L3)
Power stage MOSFET leakage
1
µ
A
Power stage MOSFET current
I
MAX(L3)
3 V < V(OUT) < 4.7 V
400
500
600
mA
limit
PWM DRIVER, PWM OPEN DRAIN OUTPUT
V
OL(PWM)
Low level output voltage
I(PWM)= 150 mA
0.5
V
Set via I
2
C, F
PWM
=
Frequency range
Hz
0.5/1/1.5/2/3/4.5/7.8/15.6
F
PWM
PWM driver frequency
Total accuracy, relative to selected value
-20%
20%
D
PWM
= 6.25% to 100%,
D
PWM
PWM driver duty cycle
Duty cycle range
set via I
2
C,
6.25% minimum step
LED_PWM DRIVER, LED_PWM OPEN DRAIN OUTPUT
D
LEDPWM
= 0% to 99.6%,
D
LEDPWM
LED_PWM driver duty cycle
Duty cycle range
set via I
2
C, 256 steps
0.4% minimum step
SM3_LF_OSC = 0
122
LED_PWM driver duty cycle
256 pulses within repetition
F
REP(LEDPWM)
Hz
pattern repetition rate
rate time
SM3_LF_OSC = 1
180
16
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