LTC3726 Datasheet, PDF (3/16 Pages) Linear Technology – Secondary-Side Synchronous Forward Controller

LTC3726
ELECTRICAL CHARACTERISTICS _{The ● indicates specifications which apply over the full operating}
temperature range, otherwise specifications are at T_A = 25°C. V_CC = 7V, GND = PGND = 0V, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V_CC Supply
V_CCOP
I_CC
Operating Voltage Range
Supply Current
Operating
Shutdown
V_UVLO
UV Lockout
V_HYS
UV Hysteresis
Oscillator and Phase-Locked Loop
f_OSC = 200kHz (Note 5)
V_RUN/SS = GND
V_CC Rising
5
10
V
4.2
mA
700
µA
● 4.52
4.60
4.70
V
0.4
V
I_FS
f_LOW
f_HIGH
∆f (R_FS)
f_PLL(MAX)
f_PLL(MIN)
FS/SYNC Pin Sourcing Current
Oscillator Low Frequency Set Point
Oscillator High Frequency Set Point
Oscillator Resistor Set Accuracy
Maximum PLL Sync Frequency
Minimum PLL Sync Frequency
V_FS/SYNC = GND
V_FS/SYNC = V_CC
75kΩ < R_FS/SYNC < 175kΩ
20
µA
170
200
230
kHz
255
300
345
kHz
–20
20
%
500
kHz
75
kHz
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LTC3726E is guaranteed to meet the 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. The
LTC3726I is guaranteed and tested over the full – 40°C to 85°C operating
temperature range.
Note 3: Operating junction temperature T_J (in °C) is calculated from the
ambient temperature T_A and the average power dissipation P_D (in Watts)
by the formula:
T_J = T_A + θ_JA • P_D
Refer to the Applications Information section for details.
Note 4: The LTC3726 is tested in a feedback loop that servos V_FB to a
voltage near the internal 0.6V reference voltage to obtain the specified ITH
voltage (V_ITH = 1.2V).
Note 5: Operating supply current is measured in test mode. Dynamic
supply current is higher due to the internal gate charge being delivered at
the switching frequency. See Typical Performance Characteristics.
3726fb
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