Electrical Characteristics: Unless otherwise stated, specifications apply for -40
≤
T
A
≤
85˚C; V
CC
= 15V (Note 1); R
T
= 10kΩ;
C
T
= 3.3nF for sawtooth mode.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
s
Total Standby Current
Start-Up Current
Operating Supply Current
V
CC
Zener Voltage
s
PWM Section
Maximum Duty Cycle
Minimum Duty Cycle
s
Undervoltage Lockout Section
Start Threshold
Min. Operating Voltage
Notes:
0.5
V
FB
=V
Sense
=0V R
T
=10kΩ, C
T
=3.3nF
I
CC
=25mA
11
34
1.0
17
mA
mA
V
46
0
48
50
%
%
7.8
After Turn On
7.0
8.4
7.6
9.0
8.2
V
V
1. Adjust V
CC
above the start threshold before setting at 15V.
2.These parameters, although guaranteed, are not 100% tested in production.
3. Parameter measured at trip point of latch with V
FB
=0.
4. Gain defined as:
A=
∆V
COMP
∆V
Sense
; 0
≤
V
Sense
≤
0.8V.
Package Pin Description
PACKAGE PIN #
PIN SYMBOL
FUNCTION
8L
SO Narrow
1
2
3
4
5
5
6
7
7
8
14L
SO Narrow
1
3
5
7
9
8
10
11
12
14
2,4,6,13
COMP
V
FB
Sense
OSC
Gnd
Pwr Gnd
V
OUT
V
CC
Pwr
V
CC
V
REF
NC
Error amp output, used to compensate error amplifier.
Error amp inverting input.
Noninverting input to Current Sense Comparator.
Oscillator timing network with Capacitor to Ground, resistor to V
REF
.
Ground.
Output driver Ground.
Output drive pin.
Output driver positive supply.
Positive power supply.
Output of 5V internal reference.
No Connection.
3
CHERRY [ CHERRY SEMICONDUCTOR CORPORATION ]
