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1.5MHz, 30A High-Efficiency, LED Driver
with Rapid LED Current Pulsing
ELECTRICAL CHARACTERISTICS (continued)
(V CC = 5V, V DD = V CC , T A = T J = T MIN to T MAX , unless otherwise noted. Typical specifications are at T A = +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
CLKOUT Phase Shift
CLKOUT Output Low Level
CLKOUT Output High Level
SYNC Input-High Pulse Width
SYNC Input Clock High Threshold
SYNC Input Clock Low Threshold
φ _ CLKOUT
V CLKOUTL
V CLKOUTH
t SYNC
V SYNCH
V SYNCL
With respect to DH, f SW = 125kHz
I SINK = 2mA
I SOURCE = 2mA
4.5
200
2.0
180
0.4
0.4
Degrees
V
V
ns
V
V
SYNC Pullup Current
SYNC Power-Off Level
I SYNC_OUT
V SYNC_OFF
V RT/SYNC = 0V
250
750
0.4
μA
V
INDUCTOR CURRENT LIMIT
Average Current-Limit Threshold
Reverse Current-Limit Threshold
V CL
V CLR
CSP to CSN
CSP to CSN
24.0
-3.2
26.9
-2.3
28.2
-0.1
mV
mV
Cycle-by-Cycle Current Limit
Cycle-by-Cycle Overload
CSP to CSN
V CSP to V CSN = 75mV
60
260
mV
ns
Hiccup Divider Ratio
LIM to V CM , no switching
0.547
0.558
0.565
V/V
Hiccup Reset Delay
200
ms
LIM Input Impedance
LIM to SGND
55.9
k ?
CURRENT-SENSE AMPLIFIER
CSP or CSN Input Resistance
R CS
4
k ?
Common-Mode Range
Input Offset Voltage
Amplifier Gain
3dB Bandwidth
V CMR(CS)
V OS(CS)
A V(CS)
f 3dB
V IN = 7V to 28V
0
0.1
34.5
4
5.5
V
mV
V/V
MHz
CURRENT-ERROR AMPLIFIER (TRANSCONDUCTANCE AMPLIFIER)
Transconductance
g m
550
μS
Open-Loop Gain
A VOL(CE)
No load
50
dB
DIFFERENTIAL VOLTAGE AMPLIFIER FOR LED CURRENT (DIFF)
Common-Mode Voltage Range
DIFF Output Voltage
Input Offset Voltage
V CMR(DIFF)
V CM
V OS(DIFF)
V SENSE+ = V SENSE- = 0V
0
-1
0.6
+1.0
+1
V
V
mV
Amplifier Gain
3dB Bandwidth
Minimum Output-Current Drive
A V(DIFF)
f 3dB
I OUT(DIFF)
C DIFF = 20pF
0.994
4
1
3
1.006
V/V
MHz
mA
SENSE+ to SENSE- Input
R VS
V SENSE- = 0V
50
100
k ?
V_IOUT AMPLIFIER
Gain-Bandwidth Product
3dB Bandwidth
Output Sink Current
Output Source Current
V V_IOUT = 2.0V
V V_IOUT = 2.0V
30
90
4
1
MHz
MHz
μA
μA
_______________________________________________________________________________________
3
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