LTC3706_15 Datasheet, PDF (3/22 Pages) Linear Technology – Secondary-Side Synchronous Forward Controller with PolyPhase Capability

LTC3706
ELECTRICAL CHARACTERISTICS The l indicates specifications which apply over the full operating
temperature range, otherwise specifications are at T_A = 25°C. V_CC = 7V, V_IN = 15V, GND = PGND = 0V, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Main Control Loop
V_FB
Regulated Feedback Voltage
(Note 4) ITH = 1.2V
l 0.594 0.600 0.606
V
I_FB
Feedback Input Current
(Note 4)
2
100
nA
∆V_FB(LINREG)
Feedback Voltage Line Regulation
V_IN = 6V to 30V, ITH = 1.2V
0.001
%/V
∆V_FB(LOADREG)
Feedback Voltage Load Regulation
Measured in Servo Loop,
ITH = 0.5V to 2V
l
–0.01 –0.1
%
V_ISMAX
V_ISOC
Maximum Current Sense Threshold
Over-Current Shutdown Threshold
VR_ISSE–N=^SEVM_CC^o,d0eV,
0<VV<_ISV_{+ I<S–2<V}
5V
(CT
Mode)
VR_ISSE–N=^SEVM_CC^o,d0eV,
0<VV<_ISV_{+ I<S–2<V}
5V
(CT
Mode)
68
78
88
mV
1.15 1.28
1.4
V
87
100
113
mV
1.45 1.65 1.85
V
g_m
Transconductance Amplifier g_m
2.40 2.75 3.10
mS
I_RUN/SS(C)
Soft-Start Charge Current
V_RUN/SS = 2V
–4
–5
–6
µA
I_RUN/SS(D)
Soft-Start Discharge Current
3
µA
V_RUN/SS
RUN/SS Pin On Threshold
V_RUN/SS Rising
l 0.4
0.45
0.5
V
t_ON,MIN
Minimum On-Time
200
ns
FG, SG R_UP
FG, SG Driver Pull-Up On Resistance FG, SG Low
1.5
2.7
Ω
FG, SG R_DOWN
PT⁺, PT^– R_UP
PT⁺, PT^– R_DOWN
FG, SG Driver Pull-Down On Resistance
PT⁺, PT^– Driver Pull-Up Resistance
PT⁺, PT^– Driver Pull-Down Resistance
FG, SG High
PT⁺, PT^– Low
PT⁺, PT^– High
1.5
2.7
Ω
1.5
2.7
Ω
1.5
2.7
Ω
∆V_FB(OV)
Output Overvoltage Threshold
V_FB Rising
15
17
19
%
V_CC Supply
V_CCOP
Operating Voltage Range
5
10
V
V_CCREG
Regulated Output Voltage
6.6
7.0
7.4
V
I_CC
Supply Current
Operating
Shutdown
f_OSC = 200kHz (Note 5)
V_RUN/SS = GND
4.2
mA
240
µA
V_UVLO
UV Lockout
V_CC Rising
l 4.52 4.60 4.70
V
V_HYS
UV Hysteresis
0.4
V
V_IN Supply
V_INOP
Operating Voltage Range
5
30
V
I_IN
Supply Current
Normal Mode
Shutdown
f_OSC = 200kHz
V_RUN/SS = GND
900
µA
460
µA
V_INUVLO
UV Lockout
V_IN Rising
l 3.90 4.30 4.51
V
V_INHYS
0.2
V
V_REGSD
REGSD Shutdown Threshold
V_REGSD Rising
4
V
g_m,REGSD
REGSD Transconductance
5
µS
3706fd
3