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PDF ( 数据手册 , 数据表 ) OZ9910

零件编号 OZ9910
描述 Change Summary
制造商 O2 Micro
LOGO O2 Micro LOGO 


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OZ9910 数据手册, 描述, 功能
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OZ9910
Change Summary
CHANGES
No. Applicable Section
1. General Description
2 Pin Description
3
Recommended Operating
Range
4 Electrical Characteristics
5 Functional Information
6 Throughout data sheet
Description
Change “74uA” to “80uA” in last sentence of last paragraph
Modify Pin 5, 6, 7, 8, 9, 11 pin descriptions
a. Change “VIN” range, b. Add “Analog Dimming” range, c.
update “Thermal Impedance”.
a. Update general test conditions, b. Update “Normal
operating frequency” test conditions, Min, Typ & Max limits,
c. Update “Striking frequency” test conditions, Min, Typ &
Max limits, d. Delete “Ramp peak”, “Ramp Valley” & “Temp
stability”, e. Update “Operating frequency” test conditions,
Min, Typ & Max limits, f. Update “Ramp peak” Min, Typ &
Max limits, g. Update “Ramp valley” Min, Typ & Max limits,
h. Delete “Analog dimming range”, i. Update “ISEN
reference voltage” Min & Max limits, j. Update “VSEN
reference voltage” Min & Max limits, k. Update “Standby
current” test conditions, Typ & Max limits, l. Update
“Operation current” Max limit, m. Update “REF voltage”
Min, Typ & Max limits, n. Update “HSB voltage” Min, Typ &
Max limits, o. Update “NDR-PDR output” Max limits, p.
Delete “Min. Overlap between diagonal switches”, q.
Update “Max. Overlap between diagonal switches” Min &
Typ limits, r. Update “Brake before make” Min, Typ & Max
limits, s. Update “Timer” Min, Typ & Max limits
Update formula in No. 4. Ignition
Miscellaneous corrections.
Page(s)
1
3
3
4-5
8
---
REVISION HISTORY
Revision No.
0.97
0.96
0.95
Description of change
1. Ordering information: Add GN, SN, IS, ISN, D & DN packages; 2. Electrical
Characteristics: b. Change High Frequency Oscillator, Normal Operating Frequency Typ
value fm 56 to 62; c. Change High Frequency Oscillator, Ramp Valley Typ value fm 7 to 100;
d. Change Low Frequency Oscillator, ‘Operating Frequency’ Typ value fm 200 to 187; e.
Change Low Frequency Oscillator, Ramp Valley fm 84.9 to 110; f. Add ‘Analog Dimming
Range’ parameter; g. Add ‘ISEN Reference Voltage’ & ‘VSEN Reference Voltage’ symbols;
h. Change Supply, HSB voltage Typ value fm 7 to Vin-5; i. Change Max./Min. Overlap, Max
Overlap between diagonal switches Typ value fm 94.5 to 95; j. Change Threshold, Vin
Under Voltage Lock Out Threshold Min. Value fm 5.8 to 5.95, Max fm 5.4 to 4.95; k. Change
Timer, Over Voltage Protection Timer Typ value fm 50 to 15; 3. Others.
1. Ordering Information: Add OZ9910S 16 pin-SSOP package; 2. Recommended Operating
Range: Add OZ9910S 16 pin-SSOP thermal impedance; 3. Electrical Characteristics: a)
Add general test conditions before “High Frequency Oscillator” ;b) Normal operating
frequency: delete test conditions; correct Typ limit to 56; c) Striking frequency: delete test
conditions; correct Typ limit to 72; d) Operating frequency: delete test conditions; e) Supply
current: correct test conditions; f) REF voltage: add Symbol; correct test conditions; g) Min.
overlap between diagonal switches & Max. overlap between diagonal switches: correct test
conditions; h) PDRV3/ NDRV2 & PDRV1/ NDRV4: correct test conditions i) Over time
protection timer: correct test conditions; 4. Function Information: a) Section 4 Ignition:
correct striking frequency equation denominator from Clct[pF] to Cct[pF} & Rrt to Rct
;b) Section 5 Normal Operation: correct fop equation numerator frm 18.7 to 9.35; c) Section
6 Proection: correct 2nd paragraph to read “If the lamp fails to ignite after approximately 1.5
seconds, the IC will shut down.”; 5. Package Information: Add OZ9910S 16 pin-SSOP
package drawings
Initial release
Release Date
10/14/2004
7/26/2004
6/15/2004
12/09/04
Copyright 2004 by O2Micro
OZ9910-DS-1.0
All Rights Reserved
Page 0
CONFIDENTIAL







OZ9910 pdf, 数据表
www.DataSheet4U.com
FUNCTIONAL INFORMATION
1. Steady-State Operation
Referring to the schematics shown in Figures 2
and 3 on pages 10 and 11 the OZ9910 drives a
zero-voltage switching (ZVS), dual forward power
stage where the transformer couples the energy
from the power source to the secondary load. In
both applications, the voltage and the current can
be used as the feedback control signals to
regulate the outputs. In CCFL applications, Figure
2, page 10 the current flowing through the CCFL is
sensed and regulated, through sense resistor R8,
then compared with a reference voltage via a
current amplifier, resulting in PWM drive outputs to
the dual forward converter switches. Switches M1,
M2, M3, M4 are configured such that the switch in
each pair, M1/M4 and M2/M3, are turned-on
complementarily. The amount of time where
switches M1/M2 and M3/M4 conduct, determine
the amount of energy delivered to the load. A
voltage loop is established to monitor the output
voltage such that a required turn-on voltage is
achieved. A soft-start circuit ensures a gradual
increase in the output power to minimize stress to
the other components. The capacitor at
CMP_SST (pin 10), determines the rate of rise of
the voltage on CMP_SST pin, where the voltage
at this pin determines the on-time duration of
switches M1/M2 and M3/M4.
Circuit operation is initiated by applying the bias
voltage to VIN (pin13) and subsequently providing
the enable signal to ENA (pin 8) of the IC. The
output drives, include NDRV4, NDRV2, PDRV3
and PDRV1 (pins 1,3,15,16 respectively) output
square pulses. The frequency is determined by
resistor R4 and capacitor C2 connected to CT (pin
5). Initially, the energy converted from the power
source to the load is low due to the soft-start
function. The energy increases as the soft-start
capacitor voltage increases linearly with time. The
voltage at the secondary side of the transformer
T1 increases correspondingly. This process
continues until the load current is detected and
reaches a regulated value. The output of the error
amplifier, CMP_SST (pin 10), compared with CT
signal at pin 5, whose valley and peak voltages
are 0.1V and 2.0V respectively, commands proper
switching among the four output drives to maintain
current regulation. The operations of the four
switches are implemented with zero-voltage
switching to provide a high-efficiency power
conversion.
In the TWT application, Figure 3, page 11 either
the current or the voltage can be used as a
feedback control
OZ9910
parameter. The operation theory is similar to the
above discussion.
Referring to Figure 2, page 10 in the case of an
open-lamp condition emulating an aged lamp, the
OZ9910 provides an optional, user-defined,
turn-on frequency. The turn-on frequency is
implemented through capacitor C2 connected to
CT pin. The striking (turn-on) time is determined
by capacitor C9 connected to LCT (pin 6). The
ignition voltage (open-lamp voltage) is regulated
through the voltage feedback loop. This highly
integrated circuit (IC) provides a cost effective yet
high-degree of design flexibility.
An open-load protection feature is provided for
safe operation when removing a lamp during
normal operation under either one of the two
following conditions. For condition one, when the
IC senses the missing current signal through ISEN
(pin 11) and the voltage at CMP_SST (pin 10)
reaches an ~2.5V threshold, the output drives are
shut off. Under condition two, when the voltage
at VSEN (pin 9) reaches an ~ 3.0V threshold, the
output drives are shut off. The output drives will
remain in the latched mode. Toggling ENA (pin 8)
is necessary to resume normal operation.
Dimming control of OZ9910 is implemented by
combining LPWM and analog-adjust for regulating
the current in the CCFL. This provides a very wide
range of dimming control to a CCFL. When ADJ
(pin 7) input voltage is less than 1.5V, the LPWM
control is activated while the amplitude of the lamp
current is maintained. This mode provides a wide
dimming control while maintaining the operational
life-time of a CCFL. The LPWM frequency is
determined by capacitor C9 and resistor R1
connected to LCT (pin 6). When ADJ (pin 7)
input voltage is greater than 1.5V, the CCFL
current amplitude will be increased.
OZ9910 operates in a constant frequency mode.
This eliminates any undesired interference
between inverter and LCD panels where
interference is usually associated with
variable-frequency designs.
2. Enable
OZ9910 is enabled when the voltage on ENA (pin
8) is greater than 2V. A voltage of less than 1V
disables the IC. When the IC is disabled, it draws
approximately 80uA. An under-voltage lockout
protection feature is provided that will disable the
IC if VIN voltage drops below a threshold of
approximately 5.6V. The IC will resume normal
operation once VIN reaches a threshold voltage of
greater than approximately 5.8V.
CONFIDENTIAL
OZ9910-DS-1.0
Page 7







OZ9910 equivalent, schematic
OZ9910
www.DataPShAeeCt4UK.cAomGE INFORMATION – 16-PIN DIP 300mil: OZ9910D
CONFIDENTIAL
OZ9910-DS-1.0
Page 15










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