Datasheet

TC646
DS21446D-page 4  2002-2012 Microchip Technology Inc.
V
IN
, V
AS
Inputs
V
C(MAX),
V
OTF
Voltage at V
IN
for 100% Duty
Cycle and Overtemp. Fault
2.5 2.65 2.8 V
V
C(SPAN)
V
C(MAX)
- V
C(MIN)
1.3 1.4 1.5 V
V
AS
Auto-shutdown Threshold V
C(MAX) ~
V
C(SPAN)
— V
C(MAX)
V
V
SHDN
Voltage Applied to V
IN
to
ensure Reset/Shutdown
—— V
DD
x 0.13 V
V
REL
Voltage Applied to V
IN
to
Release Reset Mode
V
DD
x 0.19 — — V V
DD
= 5V,
See Figure 5-11
V
HYST
Hysteresis on V
SHDN,
V
REL
— 0.01 x V
DD
—V
V
HAS
Hysteresis on Auto-shutdown
Comparator
—70—mV
Pulse Width Modulator
F
OSC
PWM Frequency 26 30 34 Hz C
F
= 1.0 µF
DC ELECTRICAL SPECIFICATIONS (CONTINUED)
Electrical Characteristics: Unless otherwise specified, T
MIN
 T
A
 T
MAX
, V
DD
= 3.0V to 5.5V
Symbol Parameter Min Typ Max Units Test Conditions
Note 1: Ensured by design, not tested.