MC7731N6 Datasheet, PDF (4/10 Pages) Cystech Electonics Corp. – Current Mode PWM Controller

CYStech Electronics Corp.
Spec. No. : C494N6
Issued Date : 2012.04.02
Revised Date :
Page No. : 4/10
Recommended Operating Conditions
● Supply Voltage, VDD………………………………………………………………………................25V
● Operating Temperature Range……………………………………………………………-20°C to 85°C
● RI resistor value …………………………………………………………………………………100 kΩ
Electrical Characteristics
(TA = 25°C, RI=100kΩ, VDD=16V if not otherwise noted)
Parameter
SUPPLY SECTION
Symbol
Test Conditions
Min
Typ
Max
Units
Chip start up current via VDD pin
Operation current
I_set
I_op
Vdd=12V, measure current into VDD
pin
VDD=16V,VFB=3V
5
20
uA
1.4
mA
VDD Off(Turn-off threshold)
UVLO_L
8
9
10
V
VDD on(Turn-on threshold)
UVLO_H
13
14
15
V
VZ(VDD clamp voltage)
VDD_CLP Iz(Idd)=10mA
34
V
FEEDBACK SECTION
PWM input gain
A_PWM
ΔVFB/ΔVCS
2
V/V
VFB open loop voltage
VFB_O
5.3
V
FB pin short circuit current
VFB_S
Short FB pin to gnd and measure
current
0.8
mA
Zero duty cycle FB threshold
VFB_th_L
0.75
V
Power limiting FB threshold
Power limiting delay time
VFB_th_P
T_PL_D
3.7
V
35
ms
Input impedance
R_FB
6
KΩ
Maxim duty cycle
D_MAX
VDD=18V, FB=3V,CS=0
80
%
OSCILLATOR
Normal oscillation frequency
FOSC
60
65
70
kHz
Frequency temperature stability
Δf_Temp
TA = -20°C to +100°C
5
%
Frequency supply stability
Operating RI range
Δf_Sup
RI_range
VDD =12-25V
5
%
50
100
150
KΩ
RI open load voltage
Burst mode base frequency
RI_open
FOSC-BM
2
V
22
KΩ
Frequency modulate range (jitter) Δf_OSC
-3
3
%
Jitter frequency
f_jitter
32
Hz
CURRENT SENSE SECTION
Leading edge blanking time
T_blank
300
nS
Sense pin input impedance
R_sense
40
kΩ
Over current threshold voltage at
sense pin
VTH_OC
FB=3.3V
0.7
0.75
0.8
V
Over current protect delay
GATE OUTPUT
T_OC_D
CS>VTH_OC, FB=3.3V
75
nS
Output low level
VOL
Io=20mA
0.8
V
Output high level
VOH
Io=20mA
10V
V
MC7731N6
CYStek Product Specification