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iT6801 데이터시트 PDF




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부품번호 iT6801 기능
기능 SELF-OSCILLATING HALF-BRIDGE DRIVER
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iT6801 데이터시트, 핀배열, 회로
iT6801
SELF-OSCILLATING HALF-BRIDGE DRIVER
1. Description
2. Features
iT6801 is a half-bridge driver with programmable
oscillator within a SOP-8L package to drive both
lower MOSFET and floating upper MOSFET. It is
suitable for electronic ballast of fluorescent lamp.
It is equipped with internal clamp of 17.2 V zener
diode, so the VCC voltage is easily regulated. For
proper operation assurance and low power start-
up, it is designed with internal under voltage
lockout (UVLO), so it takes little current for supply
capacitor voltage to builds up. Oscillator frequency
is controlled by the current drawn out from RT,
which acts as minimum base frequency. The
same current is duplicated internally to double
base frequency for preheat.
z Built in preheat function
z Lamp open or End-Of-Life detection
z Micro power start-up
z Integrated 600 V half-bridge gate driver
z Increased under-voltage lockout Hysteresis
z Lower power level-shifting circuit
z Constant LO, HO pulse widths at startup
z Lower di / dt gate driver for better noise
immunity
z Excellent latch immunity on all inputs and
outputs
3. Applications
z Electronic Ballast
4. Pin Assignments
5. Marking Information
Product Name
iT6801
1 VCC
VB 8
2 FB
HO 7
3 RT
VS 6
4 COM
LO 5
SOP-8L
Marking
iT6801
XXXXX
X : Date Code
1
Version 1.0




iT6801 pdf, 반도체, 판매, 대치품
iT6801
11. Static Electrical Characteristics
VBIAS (VCC, VBS) = 15 V, RT = 91K, VS = 0 V and TA = 25 unless otherwise specified. The output voltage and current
(VO and IO) parameters are referenced to COM and are applicable to the respective output leads : HO or LO.
CLO = CHO = 1 nF.
Symbol
Definition
Low Voltage Supply Characteristics
VCCUV+ Rising VCC under-voltage lockout threshold
VCCUV- Falling VCC under-voltage lockout threshold
VCCUVHYS VCC under-voltage lockout Hysteresis
IQCCUV Micro-power startup VCC supply current
IQCC
VCLAMP
Quiescent VCC supply current
VCC zener clamp voltage
Floating Supply Characteristics
IQBS Quiescent VBS supply current
VBSUV+ VBS supply under-voltage positive going threshold
VBSUV- VBS supply under-voltage negative going threshold
ILK Offset supply leakage current
Oscillator I / O Characteristics
fRUN Frequency range
fPRE Preheat frequency
VRT Bias voltage
NPRE Preheat steps
tPRE Preheat time
Protection Characteristics
VLOP
VLOPR
VOVP
VRUNOVP
Lamp open protection
Lamp open resumption
Over voltage protection
Run time over voltage protection
Min Typ Max Units Conditions
- 11 -
-9-V
-2-
- 25 50 μA VCC VCCUV-
- 300 -
VCC VCCUV+
- 17.2 - V
ICC = 5 mA
- 20 - μA
- 6.5 -
- 5.5 -
V
- - 50 μA VB = VS = 600 V
30 50 100 kHz
1.9 2 2.2 fRUN
1.9 2 2.1 V
- 64 - step
- 128 K - cycle
- 3.25 -
- 1.0 -
- 2.5 -
- 1.25 -
V
V
V
V
4
Version 1.0

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iT6801 전자부품, 판매, 대치품
iT6801
14. Functional Description
iT6801 is a half bridge driver with fixed 50% duty and controllable frequency.
Therefore, the ballast could be designed using minimal external component.
Under voltage lock out:
The power is supplied between VCC (pin1) and COM (pin4). Below UVLO start
voltage, controller is in UVLO state, it takes very small current, as low as 25uA, to detect
external voltage and protection. Once it rises above UVLO start voltage, the controller
starts to operate. iT6801 provides a sweep preheat function; It always starts from twice
of the frequency, and then slowly decreases. The standard preheat time is 128K cycles
of the switching period corresponds to 1.8s. In the operation mode, the controller
consumes about 3mA. It will continue to operate unless the voltage drops below UVLO
off voltage.
The VCC voltage is clamped at about 17.2V, and so VB is also clamped at 17.2V.
Oscillator
The oscillator frequency that acts as minimum base frequency is controlled by the
current drawn out from RT (pin3). The same current is duplicated internally to double
base frequency for preheat. The frequency decreased in 64 steps toward base
frequency, 2K cycles each step, giving total 128K cycles preheat time which is about 1.8
sec.
RT pin is fixed at 2.0V, and the maximum sourcing current is 50uA. More than that,
the voltage would decay. The suggested value is about 20uA, corresponds to 50KHz
base frequency.
Feed back
It is a high impedance input. Above 3.25V, iT6801 is turned into lamp open
protection. Once below 1 V, the oscillator starts to oscillate from preheat stage. During
preheat time, feedback pin is compared with 2.5V for over voltage protection. If it is
triggered, it is latched. Than the oscillator stops and IC consumes less then 300uA.
After the preheat time period, the over voltage reference is decreased to 1.75V.
During (lamp open, over voltage) protect state, the current consumption is below 300uA.
Any restart will initiate through preheat procedure.
Output
There is a dead time about 1.8 us, in which high and low side output both are low.
The sink current capability is set as 300 mA, which is stronger than 220 mA in source
current capability.
7
Version 1.0

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부품번호상세설명 및 기능제조사
iT6801

SELF-OSCILLATING HALF-BRIDGE DRIVER

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