Electrical Characteristics: continued
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
ꢀ Total Standby Current
Start-Up Current
Operating Supply Current
400
11
600
17
µA
mA
VFB = VSense = 0V, RT = 10kΩ, CT = 3.3nF
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
Min. Operating Voltage
14.5
8.5
16.0
10.0
17.5
11.5
V
V
After Turn On
Notes:
1. These parameters, although guaranteed, are not 100% tested in production.
2. Parameter measured at trip point of latch with VFB=0
3. Gain defined as:
∆VCOMP
∆VSense
A =
; 0 ≤ VSense ≤ 0.8V.
Package Pin Description
PACKAGE PIN #
PIN SYMBOL
FUNCTION
8L PDIP & SO
14L SO
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 to 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 ]
