FA7764 Datasheet, PDF (7/18 Pages) Fuji Electric – FUJI Power Supply Control IC

FA7764
(2) Recommended operating conditions
Item
Power Supply voltage (VCC)
VBIAS input voltage
Oscillation frequency
CREG pin capacitance
VBIAS pin capacitance
Symbol
V_CC
V_VBIAS
f_OSC
C_REG
C_VBIAS
Condition
MN. TYP. MAX. Units
9
45
V
3.1
5.5
V
30
400 kHz
0.1
-
-
μF
-
0.1
-
μF
(3) Electrical Characteristic
・ The characteristics is based on the condition of V_CC=42V,C_REG=0.1uF,R_T=39kΩ,Ta=+25°C,unless otherwise
specified.
・ Line regulation is the difference from 9V to 45V.
(1)Output feedback voltage (IN,VBIAS pin)
Item
Symbol
Condition
Feedback reference voltage
Variation with temperature
Input pin current
V_IN
V_{ＩＮｄＴ}
I_IN
Ta=-40 to +85°C
V_IN=0 to 2V
MIN.
0.990
-0.15
TYP.
1.000
MAX.
1.010
±1
0.15
Units
V
%
μA
(2)Regulated voltage for internal blocks (CREG pin)
Item
Symbol
Condition
MIN. TYP.
Regulated voltage
V_{ＲＥＧ}
*2
2.6
3.0
*2
CREG pin occurs over shoot voltage until about 4V in case of starting by ENB pin.
MAX. Units
V
(3)Oscillator section (RT pin)
Item
Symbol
Oscillation frequency
f_OSC
Line regulation
f_dV
Variation with temperature
f_dT
Condition
R_T=39kΩ
V_CC=9V to 45V
Ta=-40 to +85°C
MIN.
108
TYP.
120
±3
±3
MAX.
132
±5
±5
Units
kHz
%
%
(4)Soft start section
Item
Symbol
Condition
Soft start time
t_S
*4
*4
ts is the time of output voltage change from 10% to 90%
MIN.
4
TYP.
8
MAX. Units
12 ms
(5)Timer and latch for short circuit protection (CP pin)
Item
Symbol
Condition
MIN. TYP.
Delay time of timer latch
t_prot
V_CC=10V
45
90
IN pin on threshold voltage
V_THINON
V_CC=10V
*5-1
0.70 0.75
IN pin off threshold voltage V_THINOFF *5-2,5-3
0.85
IN pin Hysteresis voltage
V_THINHYS *5-3
0.10
*5-1 The counter of timer latch starts when IN pin voltage is lower than V_THINON,
*5-2 The counter of timer latch stops when IN pin voltage is higher than V_THOFF.
*5-3 Design value.
MAX. Units
180 ms
0.80 V
V
V
Fuji Electric Systems Co., Ltd.
AN-059E Rev.1.0
7
June.2010
http://www.fujielectric.co.jp/fdt/scd/