CS3845B
Electrical Characteristics: continued
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
s
Total Standby Current
Start-Up Current
Operating Supply Current
V
CC
Zener Voltage
s
PWM Section
Maximum Duty Cycle
Minimum Duty Cycle
s
Under-Voltage Lockout Section
Start Threshold
Min. Operating Voltage
Notes:
300
V
FB
=V
Sense
=0V R
T
=10kΩ, C
T
=3.3nF
I
CC
=25mA
11
34
500
17
µA
mA
V
46
48
50
0
%
%
7.8
After Turn On
7.0
8.4
7.6
∆V
COMP
∆V
Sense
9.0
8.2
V
V
1. These parameters, although guaranteed, are not 100% test-
ed in production.
2. Parameter measured at trip point of latch with V
FB
=0
3. Gain defined as: A =
; 0
≤
V
Sense
≤
0.8V.
Package Pin Description
PACKAGE PIN #
PIN SYMBOL
FUNCTION
8L PDIP & SO
1
2
3
4
5
6
7
8
14L SO
1
3
5
7
9
10
12
14
8
11
2, 4, 6, 13
COMP
V
FB
Sense
OSC
Gnd
V
OUT
V
CC
V
REF
Pwr Gnd
V
CC
Pwr
NC
Error amp output, used to compensate error amplifier
Error amp inverting input
Noninverting input in Current Sense Comparator
Oscillator timing network with Capacitor to Gnd, resistor
to V
REF
Ground
Output drive pin
Positive power supply
Output of 5V internal reference
Output driver Gnd
Output driver positive supply
No Connection
3
CHERRY [ CHERRY SEMICONDUCTOR CORPORATION ]
