Chip-Rail CR6853 - Electrical Characteristics; Supply Voltage (VDD Pin); Voltage Feedback (FB Pin); Current Sensing (SEN Pin)

CR6853
Dec, 2007 V1.1 4/11
Chengdu Chip-Rail Tech. Co., Ltd. http://www.chiprail.com
Electrical Characteristics (Ta=25°C unless otherwise noted, V
DD
= 15V)
Symbol
Parameter Conditions Min.
Typ.
Max.
Unit
Supply Voltage (V
DD
Pin)
I
ST
Startup Current 3.0
20.0
µA
V
FB
=0V 3.0
mA
V
FB
=3V 1.4
mA
I
SS
Operating Current
V
FB
=Open 1.0
mA
VDD
ON
Turn-on Threshold Voltage 13.0
14.0
15.0
V
VDD
OFF
Turn-off Threshold Voltage 7.8
8.8
9.8 V
VDD
CLAMP
VDD Clamp Voltage I
VDD
=10mA 34.0
V
VDD
AIS
Anti Intermission Surge
VDD Voltage
12.7
V
T
OFF
Over temperature Protection 130
℃
T
RESTART
Temperature restart 100
℃
Voltage Feedback (FB Pin)
I
FB
Short Circuit Current V
FB
=0V 1.2
mA
V
FB
Open Loop Voltage V
FB
=Open 4.8
V
I
FB_0D
Zero Duty Cycle FB current 1.47
mA
I
PFM
Enter PFM FB current 1.37
mA
I
CRM
Enter CRM FB current 1.45
mA
V
PFM
Enter PFM Threshold V
FB
0.51
V
V
CRM
Enter CRM Threshold V
FB
0.30
V
I
OLP&SCP
Enter OLP&SCP FB current 152
uA
V
OLP&SCP
Enter OLP&SCP FB voltage 3.7
V
T
OLP&SCP
OLP&SCP min. delay Time RI=100K 33 35 50 mS
Current Sensing (SEN Pin)
V
TH_L
SEN Minimum Voltage Level RI=100K,
FB=3.3V
0.70
V
V
TH_H
SEN Maximum Voltage Level RI=100K,
FB=3.3V
0.80
V
T
PD
Delay to Output FB=3.3V 75 ns
R
CS
Input Impedance 40 KΩ
V
SCP
Sense short protect voltage 177
mV