U3525 Datasheet, PDF (5/9 Pages) Unisonic Technologies – REGULATING PWM IC

U3525
LINEAR INTEGRATED CIRCUIT
ELECTRICAL CHARACTERISTICS(Cont.)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN TYP MAX UNIT
ERROR AMPLIFIER SECTION (V_CM = 5.1 V)
Output Low Level
0.2 0.5 V
Output High Level
3.8 5.6
V
Input Offset Voltage
V_OS
2 10 mV
Input Bias Current
I_b
1 10 µA
Input Offset Current
I_os
1 µA
Comm. Mode Reject.
CMR V_CM = 1.5 ~ 5.2 V
60 75
dB
Supply Voltage Rejection
PSR V_IN = 8 ~ 35 V
50 60
dB
DC Open Loop Gain
DC Transconduct. (Note 1, 3)
Gain Bandwidth Product (Note 1)
R_L ≥10 MΩ
30 KΩ ≤R_L≤1 MΩ, T_J = 25℃
Gv = 0 dB, T_J = 25℃
60 75
1.1 1.5
1
2
dB
ms
MHz
PWM COMPARATOR
Input Threshold (Note 2)
Input Bias Current (Note 1)
Zero Duty-cycle
Maximum Duty-cycle
0.7 0.9
V
3.3 3.6 V
0.05 _{1 µA}
Minimum Duty-cycle
0%
Maximum Duty-cycle (Note 2)
45 49
%
SHUTDOWN SECTION
Soft Start Low Level
Shutdown Threshold
V_SD = 2.5 V
0.4 0.7 V
To outputs, V_SS = 5.1 V, T_J = 25℃ 0.6 0.8 1
V
Shutdown Input Current
V_SD = 2.5 V
0.4 1 mA
Soft Start Current
Shutdown Delay (Note 1)
V_SD = 0 V, V_SS = 0 V
V_SD = 2.5 V, T_J = 25℃
25 50 80 µA
0.2 0.5 µs
OUTPUT DRIVERS (each output) (V_C = 20 V)
Output Low Level
I_SINK = 20 mA
I_SINK = 100 mA
0.2 0.4 V
1
2
V
Output High Level
I_SOURCE = 20 mA
I_SOURCE = 100 mA
18 19
V
17 18
V
Under-Voltage Lockout
V_COMP and V_SS = High
6
7
8
V
Collector Leakage
I_C
V_C = 35 V
200 µA
Rise Time (Note 1)
t_R
C_L = 1 nF, T_J = 25 °C
100 600 ns
Fall Time (Note 1)
t_F
C_L = 1 nF, T_J = 25 °C
50 300 ns
TOTAL STANDBY CURRENT
Supply Current
I_S
V_IN = 35 V
Note:1.The parameters are not 100% tested in production.
14 20 mA
2.Tested at fosc=40 KHz (R_T=3.6 KΩ, C_T=10nF, R_D=0 Ω). Approximate oscillator frequency is defined by :
1
f=
C_T(0.7R_T + 3R_D)
3.DC transconductance (g_M) relates to DC open-loop voltage gain (G_V) according to the following equation:
G_V=g_M R_L where R_L is the resistance from pin 9 to ground. The minimum g_M specification is used to calculate
minimum G_V when the error amplifier output is loaded.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
5 of 9
QW-R103-032,A