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LD7550
4
Leadtrend Technology Corporation
LD7550-DS-00 August 2004
Electrical Characteristics
(TA = +25
oC unless otherwise stated, V
CC=15.0V)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Supply Voltage (Vcc Pin)
Startup Current
5
25
µA
VCOMP=0V
3
4
mA
VCOMP=3V
2
mA
Operating Current
VCOMP=open
0.7
mA
UVLO (off)
10.4
11.4
12.4
V
UVLO (on)
14.8
16.0
17.5
V
Voltage Feedback (Comp Pin)
Short Circuit Current
VCOMP=0V
2.2
3.0
mA
Open Loop Voltage
COMP pin open
5.0
V
Green Mode Threshold VCOMP
2.35
V
Current Sensing (CS Pin)
Maximum Input Voltage
0.80
0.85
0.90
V
Leading Edge Blanking Time
250
nS
Input impedance
50
K
Ω
Delay to Output
300
nS
Oscillator (RT pin)
Frequency
RT=100K
Ω
61.5
66.5
71.5
KHz
Green Mode Frequency
Fs=66.5KHz
20
KHz
Temp. Stability
(-30
°C ~85°C)
5
%
Voltage Stability
(VCC=12V-30V)
2
%
Gate Drive Output (OUT Pin)
Output Low Level
VCC=15V, Io=20mA
1
V
Output High Level
VCC=15V, Io=20mA
8
V
Rising Time
Load Capacitance=1000pF
50
200
nS
Falling Time
Load Capacitance=1000pF
30
125
nS
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