LT1246 Datasheet, PDF (3/12 Pages) Linear Technology – 1MHz Off-Line Current Mode PWM and DC/DC Converter

LT1246/LT1247
ELECTRICAL CHARACTERISTICS (Notes 1, 2)
PARAMETER
Error Amplifier Section
Output Voltage High Level
Output Voltage Low Level
Current Sense Section
Gain
Maximum Current Sense Input Threshold
Power Supply Rejection Ratio
Input Bias Current
Delay to Output
Blanking Time
Blanking Override Voltage
Output Section
Output Low Level
Output High Level
Rise Time
Fall Time
Output Clamp Voltage
Undervoltage Lockout
Start-Up Threshold
Minimum Operating Voltage
Hysteresis
PWM
Maximum Duty Cycle
Minimum Duty Cycle
Total Device
Start-Up Current
Operating Current
CONDITIONS
V_{PIN 2} = 2.3V, R_L = 15k to GND
V_{PIN 2} = 2.7V, R_L = 15k to Pin 8
V_{PIN 3} < 1.1V
I_OUT = 20mA
I_OUT = 200mA
I_OUT = 20mA
I_OUT = 200mA
C_L = 1nF, T_J = 25°C
C_L = 1nF, T_J = 25°C
I_O = 1mA
LT1246
LT1247
LT1246
LT1247
LT1246
LT1247
T_J = 25°C
T_J = 25°C
MIN
TYP
q
5
5.6
q
0.2
q
2.85
3.00
q
0.90
1.00
70
q
–1
30
60
1.5
q
0.25
q
0.75
q
12.0
q
11.75
30
20
q
18
q
15
16
q
7.8
8.4
q
9.0
10
q
7.0
7.6
q
5.5
6.0
q
0.4
0.8
94
0
q
170
q
13
MAX
UNITS
V
1.1
V
3.15
V/V
1.10
V
dB
–10
µA
ns
ns
V
0.4
V
2.2
V
V
V
70
ns
60
ns
19
V
17
V
9.0
V
11
V
8.2
V
V
V
100
%
%
250
µA
20
mA
The q denotes those specifications which apply over the full operating
temperature range.
Note 1: Unless otherwise specified, V_CC = 15V, R_T = 10k, C_T = 3.3nF.
Note 2: Low duty cycle pulse techniques are used during test to maintain
junction temperature close to ambient.
3