参数资料
| 型号： | DS3994Z+T&R |
| 厂商： | Maxim Integrated |
| 文件页数： | 7/28页 |
| 文件大小： | 0K |
| 描述： | IC CCFL CNTRLR 4CH 28-SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1,000 |
| 类型： | CCFL 控制器 |
| 频率： | 20 ~ 80 kHz |
| 电流 - 电源： | 9mA |
| 电源电压： | 4.5 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 28-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 28-SOIC W |
| 包装： | 带卷 (TR) |
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4-Channel Cold-Cathode
Fluorescent Lamp Controller
Pin Description
NAME
PINS BY CHANNEL (n = 1–4)
CH 1 CH 2 CH 3 CH 4
FUNCTION
GAn
GBn
7
8
11
12
17
18
21
22
MOSFET A Gate Drive. Connect directly to logic-level mode
n-channel MOSFET. Leave open if channel is unused.
MOSFET B Gate Drive. Connect directly to logic-level mode
n-channel MOSFET. Leave open if channel is unused.
Lamp Current Monitor Input. Lamp current is monitored by measuring a
LCMn
9
13
19
23
voltage across a resistor placed in series with the low-voltage side of the
lamp. Leave open if channel is unused.
Overvoltage Detection. Lamp voltage is monitored through a capacitor-
OVDn
10
14
20
24
divider placed on the high-voltage side of the transformer. Leave open if
channel is unused.
NAME
GND
V CC
BRIGHT
SVM
SDA
SCL
FAULT
LSYNC
LOSC
A0
PSYNC
POSC
PIN
15
16
5
6
25
26
27
28
1
2
3
4
FUNCTION
Ground Connection
Power-Supply Connection
Analog Brightness Control Input. Used to control DPWM dimming. Ground when using a PWM signal at
PSYNC to control brightness.
Supply Voltage Monitor Input. Used to monitor the inverter voltage for undervoltage conditions.
Serial Data Input/Output. I 2 C bidirectional data pin, which requires a pullup resistor to realize high logic levels.
Serial Clock Input. I 2 C clock input.
Fault Output. This active-low, open-drain pin, requires an external pullup resistor to realize high logic levels.
Lamp Frequency Input/Output. This pin is the input for an externally sourced lamp frequency when the
DS3994 is configured as a lamp frequency receiver. If the DS3994 is configured as a lamp frequency source
(i.e., the lamp frequency is generated internally), the frequency is output on this pin for use by other lamp
frequency receiver DS3994s.
Lamp Oscillator Resistor Adjust. A resistor to ground on this pin sets the frequency of the lamp oscillator.
Address Select Input. Determines the DS3994’s I 2 C slave address.
DPWM Input/Output. This pin is the input for an externally generated DPWM signal when the DS3994 is
configured as a DPWM receiver. If the DS3994 is configured as a DPWM source (i.e., the DPWM signal is
generated internally), the DPWM signal is output on this pin for use by other DPWM receiver DS3994s.
DPWM Oscillator Resistor Adjust. A resistor to ground on this lead sets the frequency of the DPWM
oscillator (dimming clock). This lead can optionally accept a 22.5Hz to 440Hz clock as the source timing for
the internal DPWM signal.
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