LTC3783 Datasheet, PDF (3/24 Pages) Linear Technology – PWM LED Driver and Boost, Flyback and SEPIC Controller

LTC3783
ELECTRICAL CHARACTERISTICS
The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are T_A = 25°C.
V_IN = 12V, V_RUN = 1.5V, V_SYNC = 0V, V_FBP = V_REF, R_T = 20k, unless otherwise specified.
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX
I_RUN
RUN Pin Input Current
V_SENSE(MAX) Maximum Current Sense Threshold
I_SENSE(ON) SENSE Pin Current (GATE High)
I_SENSE(OFF) SENSE Pin Current (GATE Low)
I_SS
Soft-Start Pin Output Current
Voltage/Temperature Reference
V_SENSE = 0V
V_SENSE = 36V
V_SS = 0V
5
125
150 180
70
0.2
–50
V_REF
Reference Voltage
1.218 1.230 1.242
● 1.212
1.248
I_REF
Max Reference Pin Output Current
∆V_REF/∆V_IN Reference Voltage Line Regulation
∆V_REF/∆I_REF Reference Voltage Load Regulation
T_MAX
Overtemperature SD Threshold
Rising
3V ≤ V_IN ≤ 36V
0mA ≤ I_REF ≤ 0.5mA
0.5
0.002 0.02
0.2 1.0
165
T_HYST
Overtemperature Hysteresis
25
Error Amplifier
I_OV/FB
∆V_OV/FB(OV)
V_OV/FB(FB)
I_FBP, I_FBN
V_FBP – V_FBN
g_m
A_VOL
Oscillator
OV/FB Pin Input Current
OV/FB Overvoltage Lockout Threshold V_OV/FB(OV) – V_OV/FB(NOM) in %, V_FBP ≤ V_REF
OV/FB Pin Regulation Voltage
2.5V < V_FBP < 36V
Error Amplifier Input Current
0V ≤ V_FBP ≤ V_REF
2.5V < V_FBP < 36V
Error Amplifier Offset Voltage
(Note 5)
0V ≤ V_FBP ≤ V_REF
2.5V < V_FBP ≤ 36V (V_ILIM = V_REF)
2.5V < V_FBP ≤ 36V (V_ILIM = 0.123V)
Error Amplifier Transconductance
V_FBP ≤ V_REF
2.5V < V_FBP < 36V
Error Amplifier Open-Loop Gain
1.212
–3
500
18
7
1.230
– 0.4
50
100
10
1.7
14
60
1.248
3
f_OSC
Oscillator Frequency
Oscillator Frequency Range
R_FREQ = 20kΩ
250 300 350
20
1000
D_MAX
f_SYNC/f_OSC
t_SYNC(MIN)
t_SYNC(MAX)
V_IH(SYNC)
V_HYST(SYNC)
R_SYNC
t_ON(MIN)
Maximum Duty Cycle
Recommended Max SYNC Freq Ratio
SYNC Minimum Input Pulse Width
SYNC Maximum Input Pulse Width
SYNC Input Voltage High Level
SYNC Input Voltage Hysteresis
SYNC Input Pull-Down Resistance
Minimum On-time
f_OSC = 300kHz (Note 6)
V_SYNC = 0V to 5V
V_SYNC = 0V to 5V
With Sense Resistor, 10mV Overdrive
No R_SENSE Mode
85
90 97
1.25 1.3
25
0.8/f_OSC
1.2
0.5
100
170
300
UNITS
nA
mV
µA
µA
µA
V
V
mA
%/V
%/mA
°C
°C
nA
%
V
µA
µA
mV
mV
mV
mmho
mmho
V/V
kHz
kHz
%
ns
ns
V
V
kΩ
ns
ns
3783f
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