TL3577 Datasheet, PDF (4/21 Pages) Texas Instruments – 100-kHz CURRENT-MODE SIMPLE STEP-UP/FLYBACK SWITCHING REGULATOR

TL3577
100-kHz CURRENT-MODE SIMPLE STEP-UP/FLYBACK SWITCHING REGULATOR
SLVS633 – OCTOBER 2006
www.ti.com
Electrical Characteristics
V_IN = 5 V, V_FEEDBACK = V_REF, I_SWITCH = 0 (unless otherwise noted)
PARAMETER
TEST CONDITIONS
T_J
V_OUT
DV_OUT
DV_IN
DV_OUT
DI_LOAD
η
I_CC
V_UV
f_O
V_REF
DV_REF
DV_IN
I_B
G_M
A_VOL
I_SS
D
DI_SWITCH
DV_COMP
I_L
V_SAT
Output voltage
Line regulation
V_IN = 5 V to 10 V,
I_LOAD = 100 mA to 800 mA, See Figure 1
V_IN = 3.5 V to 10 V, I_LOAD = 200 mA,
See Figure 1
Load regulation
Efficiency
Input supply current
I_LOAD = 100 mA to 800 mA, See Figure 1
I_LOAD = 800 mA, See Figure 1
V_FEEDBACK = 1.5 V (SWITCH Off)
I_SWITCH = 2 A,
V_COMP = 2 V (maximum duty cycle)
Input supply undervoltage lockout I_SWITCH = 100 mA
Oscillator frequency
Measured at SWITCH, I_SWITCH = 100 mA
Reference voltage
Measured at FEEDBACK,
V_IN = 3 V to 40 V, V_COMP = 1 V
Reference voltage line regulation V_IN = 3 V to 40 V
Error amplifier input bias current V_COMP = 1 V
Error amplifier transconductance I_COMP = –30 µA to 30 µA, V_COMP = 1 V
Error amplifier voltage gain
V_COMP = 1.1 V to 1.9 V, R_COMP = 1 MΩ⁽¹⁾
Error amplifier output swing
Upper limit, V_FEEDBACK = 1 V
Lower limit, V_FEEDBACK = 1.5 V
Error amplifier output current
V_FEEDBACK = 1 V to 1.5 V, V_COMP = 1 V
Soft-start current
V_FEEDBACK = 1 V, V_COMP = 0
Maximum duty cyle
V_COMP = 1.5 V, I_SWITCH = 100 mA
Switch transconductance
Switch leakage current
Switch saturation voltage
NPN switch current limit
V_SWITCH = 65 V,
V_FEEDBACK = 1.5 V (SWITCH off)
I_SWITCH = 2 A,
V_COMP = 2 V (maximum duty cycle)
V_COMP = 2 V
25°C
Full range
25°C
Full range
25°C
Full range
25°C
25°C
Full range
25°C
Full range
25°C
Full range
25°C
Full range
25°C
Full range
25°C
25°C
Full range
25°C
Full range
25°C
Full range
25°C
Full range
25°C
Full range
25°C
Full range
25°C
Full range
25°C
Full range
25°C
25°C
Full range
25°C
Full range
25°C
Full range
TL3577-ADJ
MIN TYP MAX
11.6
12 12.4
11.4
12.6
20
50
100
20
50
100
80
7.5
10
14
45
70
85
2.7 2.85
2.95
85
100
115
80
120
1.214 1.23 1.246
1.206
1.254
UNIT
V
mV
mV
%
mA
V
kHz
V
0.5
mV
2400
1600
500
250
2.2
2
±130
±90
2.5
1.5
88
84
100
3700
800
2.4
0.3
±200
5
90
300
nA
800
4800
µmho
5800
V/V
V
0.4
0.55
±300
µA
±400
7.5
µA
9.5
%
12.5
A/V
10
300
µA
600
0.5
0.7
V
0.9
3.7
4.3
5.3
A
3
6
(1) A 1-MΩ resistor is connected to the compensation pin (which is the error amplifier output) to ensure accuracy in measuring A_VOL. In
actual applications, this load resistance should be ≥10 MΩ, resulting in A_VOL that is typically twice the specified minimum limit.
4
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