LTC3803 Datasheet, PDF (3/12 Pages) Linear Technology – Constant Frequency Current Mode Flyback DC/DC Controller in ThinSOT

ELECTRICAL CHARACTERISTICS
T_J = T_A + (P_D • 230°C/W).
Note 4: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency.
Note 5: The LTC3803 is tested in a feedback loop that servos V_FB to the
output of the error amplifier while maintaing I_TH/RUN at the midpoint of
the current limit range.
LTC3803
Note 6: Peak current sense voltage is reduced dependent on duty cycle
and an optional external resistor in series with the SENSE pin (R_SL). For
details, refer to the programmable slope compensation feature in the
Applications Information section.
Note 7: Guaranteed by design.
TYPICAL PERFOR A CE CHARACTERISTICS
Reference Voltage vs Temperature
800.5
V_CC = 8V
800.0
799.5
799.0
798.5
798.0
797.5
797.0
–50 –30 –10 10 30 50 70
TEMPERATURE (°C)
90 110
3803 G01
Oscillator Frequency
vs Temperature
210 _{VCC = 8V}
205
200
195
190
185
180
–50 –30 –10 10 30 50 70
TEMPERATURE (°C)
90 110
3803 G04
Reference Voltage
vs Supply Voltage
801.0
800.8
800.6
T_A = 25°C
V_CC ≤ V_CLAMP1mA
800.4
800.2
800.0
799.8
799.6
799.4
799.2
799.0
6
6.5 7 7.5 8 8.5
V_CC SUPPLY VOLTAGE (V)
9 9.5
3803 F02
Oscillator Frequency
vs Supply Voltage
210 _{TA = 25°C}
208
206
204
202
200
198
196
194
192
190
6 6.5 7 7.5 8 8.5 9
V_CC SUPPLY VOLTAGE (V)
3803 G05
Reference Voltage
vs V_CC Shunt Regulator Current
804
T_A = 25°C
803
802
801
800
799
798
797
796
0
5
10
15
20
25
I_CC (mA)
3803 G03
Oscillator Frequency
vs V_CC Shunt Regulator Current
210 _{TA = 25°C}
208
206
204
202
200
198
196
194
192
190
0
5
10
15
20
25
I_CC (mA)
3803 G06
3803i
3