LTC3783 Datasheet, PDF (4/24 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_J = 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
Low Dropout Regulator
V_INTVCC
UVLO
INTV_CC Regulator Output Voltage
INTV_CC Undervoltage Lockout
Thresholds
V_OV/FB = 1.5V
Rising INTV_CC
Falling INTV_CC
Hysteresis
● 6.5
1.8
7 7.5
2.3 2.5
2.1
0.2
∆V_INTVCC
∆V_IN
∆V_LDO(LOAD)
V_DROPOUT
I_INTVCC(SD)
INTV_CC Line Regulation
INTV_CC Load Regulation
INTV_CC Dropout Voltage
Bootstrap Mode INTV_CC Supply
Current in Shutdown
GATE/PWMOUT Drivers
12V ≤ V_IN ≤ 36V
0 ≤ I_INTVCC ≤ 10mA
V_IN = 7V, I_INTVCC = 10mA
V_SENSE = 0V
V_SENSE = 7V
2
6
–1
– 0.1
300 500
25
15
t_r(GATE)
GATE Driver Output Rise Time
C_L = 3300pF (Note 7)
15
t_f(GATE)
GATE Driver Output Fall Time
C_L = 3300pF (Note 7)
8
I_{PK(GATE,RISE)} GATE Driver Peak Current Sourcing
V_GATE = 0V
0.5
I_{PK(GATE,FALL)} GATE Driver Peak Current Sinking
V_GATE = 7V
1
V_PWMIN
PWMIN Pin Input Threshold Voltages Rising PWMIN
1.6
Falling PWMIN
0.8
Hysteresis
0.8
R_PWMIN
PWMIN Input Pull-Up Resistance
100
t_r(PWMOUT)
PWMOUT Driver Output Rise Time
C_L = 3300pF (Note 7)
30
t_f(PWMOUT)
PWMOUT Driver Output Fall Time
C_L = 3300pF (Note 7)
16
I_{PK(PWMOUT,RISE)} PWMOUT Driver Peak Current Sourcing V_PWMOUT = 0V
0.25
I_{PK(PWMOUT,FALL)} PWMOUT Driver Peak Current Sinking V_PWMOUT = 7V
0.50
UNITS
V
V
V
V
mV/V
%
mV
µA
µA
ns
ns
A
A
V
V
V
kΩ
ns
ns
A
A
Note 1: Absolute Maximum Ratings are those values beyond which the life
of the device may be impaired.
Note 2: The LTC3783E is guaranteed to meet performance specifications
from 0°C to 85°C junction temperature. Specifications over the – 40°C to
85°C operating temperature range are assured by design, characterization
and correlation with statistical process controls.
Note 3: T_J is calculated from the ambient temperature T_A and power
dissipation P_D according to the following formula:
T_J = T_A + (P_D • 43°C/W) for the DFN
T_J = T_A + (P_D • 38°C/W) for the TSSOP
Note 4: The dynamic input supply current is higher due to power MOSFET
gate charging (Q_G • f_OSC). See Operation section.
Note 5: The LTC3783 is tested in a feedback loop which servos V_FBN to
V_FBP = V_VREF with the I_TH pin forced to the midpoint of its voltage range
(0.3V ≤ V_ITH ≤ 1.2V; midpoint = 0.75V).
Note 6: In a synchronized application, the internal slope compensation is
increased by 25%. Synchronizing to a significantly higher ratio will reduce
the effective amount of slope compensation, which could result in sub-
harmonic oscillation for duty cycles greater than 50%
Note 7: Rise and fall times are measured at 10% and 90% levels.
3783f
4