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