ICHAUS IC-NZP

ar y
n
i
im
prel
iC-NZP
P-TYPE LASER DIODE DRIVER
Rev B1, Page 1/15
FEATURES
APPLICATIONS
♦ Peak value controlled laser driver for operation from CW up to
155 MHz
♦ Spike-free switching of laser currents of up to 300 mA
♦ Setting of laser power (APC) via external resistor
♦ Optional current control (ACC)
♦ Laser current limitation
♦ LVDS/TTL switching input with TTL monitor output
♦ Low current consumption sleep-mode < 50 µA
♦ Safety shutdown with overtemperature
♦ Error signal output with overtemperature, undervoltage and
overcurrent
♦ All current LD types can be used (P/M/N configurations)
♦ Fast soft-start
♦ Strong suppression of transients with small external capacitors
♦ Pulsed and CW laser diode
modules
♦ Laser diode pointers
♦ Laser levels
♦ Bar-code readers
♦ Distance measurement
PACKAGES
QFN24
4 mm x 4 mm
BLOCK DIAGRAM
RVDD
+3..+5.5V
VDD
CVDD
i(RSI)x540
RSI
NSLP
0.68.. 9kΩ
REGE
CVDDA
iC-NZP
LDA MONITOR
100 nF..
RSI
VDDA
100 nF..
VDDL
VDD
&
AVG
ECI
..10 nF..
VSY
SYN
EP
REF
LVDS/TTL
CI
x280
LDA
VDD
IMON
VDD
MD
TTL
NCID
RMD
CI
+
+
EN
-
PMD
CIS
1
&
..300mA
ECI
OUTPUT DRIVER
INPUT INTERFACE
P
NERR
OverTemp.
1
GND
OverCurrent
Bandgap, Reference, Overtemp
Low V(LDA)
T.PAD
GND
OUTPUT MONITOR
RGND
suitable laser diode configurations
P
Copyright © 2011 iC-Haus
M
N
http://www.ichaus.com
ar y
n
i
im
prel
iC-NZP
P-TYPE LASER DIODE DRIVER
Rev B1, Page 2/15
DESCRIPTION
Laser diode pulse driver iC-NZP allows CW operation of laser diodes and spike-free switching with defined current pulses up to 155 MHz. The optical output power of the laser diode is set-up by means of an
external resistor (RMD/PMD). For laser current control without a monitor diode, the laser current monitor at pin IMON is utilised. For high pulse frequencies the device can be switched into controlled burst
mode. A previously settled operating point is maintained throughout the burst phase.
An averaging current monitor can be set by an external resistor at pin RSI. When the current limit is
reached, overcurrent is signalled at NERR and the
current from pin VCCA is limited to the pre-set value
but the iC is not shut down. There is an additional
current limitation in pin LDA that prevents the iC from
overpowering the laser diode.
Setting pin NSLP low, the iC enters a low consumption sleep-mode (< 50 µA typ.).
PACKAGES QFN24 4 mm x 4 mm to JEDEC
PIN CONFIGURATION
24
23
PIN FUNCTIONS
No. Name Function
22
21
20
19
1
18
2
17
16
3
NZP
code...
...
4
5
15
14
13
6
7
8
9
10
11
12
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
VDD
GND
MD
IMON
NCID
EP
EN
TTL
VSY
SYN
RGND
RVDD
LDA
CI
CIS
VDDL
VDDA
AVG
RSI
REGE
GND
NSLP
NERR
Power Supply
Ground
APC setup, monitor input
Laser Current Monitor
Disable Pulldown Current at CI
Positive LVDS/TTL switching input
Negative LVDS switching input
Enable TTL input
Sync Output Supply Voltage
Sync Output
Reference Ground
Reference (P-type laser diodes)
Laser Diode Anode
Power Control Capacitor
Power Control Capacitor sense
Laser Power Supply
Analogue Power Supply
Averaging Control Enabled
Current Monitor Setup
Control Enable
Ground
Not Sleep-Mode
Error Output
n/c
The Thermal Pad is to be connected to a Ground Plane (GND) on the PCB.
Only pin 1 marking on top or bottom defines the package orientation ( NZP label and coding is subject
to change).
ar y
n
i
im
prel
iC-NZP
P-TYPE LASER DIODE DRIVER
Rev B1, Page 3/15
PACKAGE DIMENSIONS
RECOMMENDED PCB-FOOTPRINT
3.80
2.49
15
R0.
TOP
0.30
0.70
0.50
0.25
0.40
3.80
0.90
2.49
SIDE
BOTTOM
2.45
4
2.45
4
0.50
dra_qfn24-1_pack_1, 10:1
All dimensions given in mm.
iC-NZP
P-TYPE LASER DIODE DRIVER
ar y
n
i
im
prel
Rev B1, Page 4/15
ABSOLUTE MAXIMUM RATINGS
Beyond these values damage may occur; device operation is not guaranteed.
Item
No.
Symbol
Parameter
Conditions
Unit
Min.
Max.
G001 VDD
Voltage at VDD
-0.7
6
V
G002 I(VDD)
Current in VDD
DC current
-2
1200
mA
G003 I(CI)
Current in CI
V(LDA) = 0
-2
5
mA
G004 I(NERR)
Current in NERR
-2
20
mA
G005 I(MD)
Current in MD
-2
20
mA
G006 I()dig
Current in EP, EN, TTL, REGE, NSLP,
AVG, NCID
-2
20
mA
G007 I(VDDL)
Current in VDDL
DC current
-2
1200
mA
G008 I(VDDA)
Current in VDDA
DC current
-1200
2
mA
G009 I(LDA)
Current in LDA
DC current
-1200
2
mA
G010 I(RSI)
Current in RSI
-2
20
mA
G011 I(VSY)
Current in VSY
-2
50
mA
G012 I(SYN)
Current in SYN
-2
50
mA
G013 I(IMON)
Current in IMON
-20
2
mA
G014 V()c
Voltage at RSI, VSY, SYN, EP, EN,
TTL, REGE, AVG, NCID, RGND, MD,
CI, IMON, RVDD, LDA, NERR, NSLP
-0.7
6
V
G015 Vd()
ESD Susceptibility at all pins
4
kV
G016 Tj
Operating Junction Temperature
-40
190
°C
G017 Ts
Storage Temperature Range
-40
190
°C
HBM, 100 pF discharged through 1.5 kΩ
THERMAL DATA
Operating Conditions: VDD = 3...5.5 V
Item
No.
Symbol
Parameter
Conditions
Unit
Min.
T01
Ta
Operating Ambient Temperature Range
(extended range on request)
T02
Rthja
Thermal Resistance Chip/Ambient
Typ.
-20
surface mounted, thermal pad soldered to ca.
2 cm² heat sink
All voltages are referenced to ground unless otherwise stated.
All currents flowing into the device pins are positive; all currents flowing out of the device pins are negative.
30
Max.
85
°C
40
K/W
iC-NZP
P-TYPE LASER DIODE DRIVER
ar y
n
i
im
prel
Rev B1, Page 5/15
ELECTRICAL CHARACTERISTICS
Operating Conditions: VDD = 3...5.5 V, VSY = 0 V...VDD, Tj = -40...85 °C, NSLP = hi, NCID = hi; unless otherwise stated
Item
No.
Symbol
Parameter
Conditions
Unit
Min.
Typ.
Max.
Total Device
001
VDD
Permissible Supply Voltage
002
VSY
Permissible Supply Voltage at
VSY
VSY ≤ VDD
003
Ioff(VDD)
Supply Current in VDD
NSLP = lo, all other input pins set to lo
5
50
µA
004
Idc(VDD)
Supply Current in VDD
RSI ≥ 680 Ω
10
15
mA
005
I(VSY)
Supply Current in VSY
SYN pin open
10
µA
006
Toff
Thermal Shutdown Threshold
130
196
°C
007
VDDon
Power-On Threshold
1.7
2.8
V
008
Vc()hi
Clamp Voltage hi at RSI, TTL,
I() = 0.1 mA, other pins open, VDD = 0
REGE, MD, CI, LDA, VDDA,
VDDL, NSLP, IMON, NCID, AVG
0.3
1.6
V
009
Vc(SYN)hi Clamp Voltage hi to VSY
010
Vc()lo
011
Vc(VSY)hi Clamp Voltage hi at VSY
I() = 1 mA, other pins open, VSY = 0
Clamp Voltage lo at VDD, AVG, I() = -1 mA, other pins open
MD, IMON, NCID, EP, EN, TTL,
VSY, SYN, RVDD, VDDL, VDDA,
CI, LDA, RSI, REGE, NSLP,
NERR
3
5.5
V
3
5.5
V
0.3
-1.5
-0.65
I() = 1 mA, other pins open, VDD = 0
1.5
V
-0.3
V
6
V
580
mV
9
9
kΩ
kΩ
620
mV
Current Monitor RSI, VDDA, VDDL, LDA
101
102
V(RSI)
Voltage at RSI
RSI
Permissible Resistor at RSI
103
V(VDDA)
VDDA Voltage Monitor Threshold VDD − V(VDDA), V(RSI) = VDD
104
105
V(VDDL)
Permissible voltage at VDDL
Ierr(VDDA) Maximum current from VDDA
without error signalling
420
VDD = 3...3.5 V
VDD = 4.5...5.5 V
When not connected to VDDA
V(RSI) = VDD;
VDD = 4.5...5.5 V
VDD = 3...3.5 V
500
2.5
0.68
400
500
0
V(VDD)
-980
-820
-400
-270
106
Cmin()
Minimum capacitor required at
VDDA
100
107
rIVDDA
Current Ratio
I(VDDA)max / I(RSI)
V(VDDA) = 0 V;
VDD = 3...5.5 V
460
630
108
rILDA
Current Ratio I(LDA)max / I(RSI)
V(REGE) = V(TTL) = V(EP) = VDD,
V(LDA) = 0 V, V(MD) = 0;
VDD = 3...5.5 V
470
970
109
i(LDA)
Maximum limited current
RSI = 680 Ω, VDD = 5.5 V
-630
110
Rdis()
Discharge Resistor at VDDA
NSLP = lo, V(VDDA) = VDD
mA
mA
nF
mA
1
20
kΩ
320
mV
Reference
201
V(MD)
Reference Voltage
V(MD) − V(RGND),
V(RVDD) − V(MD) for P-type LD,
closed control loop
202
dV(MD)
Temperature Drift of Voltage at
MD
closed control loop
203
V(MD)
Precharge Reference Voltage
V(RVDD) − V(MD);
V(EP) = 0, V(AVG) = 0, P-type MD
230
210
250
120
280
µV/°C
360
mV
VDD −
1.4
V
Digital Inputs/Outputs
301
Vin()
Input Voltage Range at EP, EN
TTL = lo, VDD = 3.0...5.5 V
0.6
302
Vd()
Input Differential Voltage at EP,
EN
TTL = lo, Vd() = |V(EP) − V(EN)|
200
303
R()
Differential Input Impedance at
EP, EN
V(EP), V(EN) < VDD − 1.5 V, TTL = lo
0.6
304
Vt(EP)hi
Input Threshold Voltage hi at EP TTL = hi, EN = open
305
Vt(EP)lo
Input Threshold Voltage lo at EP TTL = hi, EN = open
0.8
mV
3
kΩ
2
V
V
iC-NZP
P-TYPE LASER DIODE DRIVER
ar y
n
i
im
prel
Rev B1, Page 6/15
ELECTRICAL CHARACTERISTICS
Operating Conditions: VDD = 3...5.5 V, VSY = 0 V...VDD, Tj = -40...85 °C, NSLP = hi, NCID = hi; unless otherwise stated
Item
No.
Symbol
Parameter
Conditions
Unit
Min.
306
Vhys(EP)
Hysteresis at EP
TTL = hi, EN = open
40
307
Ipd(EP)
Pull-Down Current at EP
TTL = hi, EN = open, V() = 1 V...VDD
0.5
308
Vt()hi
Input Threshold Voltage hi at
TTL, REGE, NSLP, AVG, NCID
309
Vt()lo
Input Threshold Voltage lo at
TTL, REGE, NSLP, AVG, NCID
0.8
310
Vhys()
Hysteresis at TTL, REGE, NSLP,
AVG, NCID
130
311
Ipu()
Pull-Up Current at TTL, REGE,
NCID
312
Ipd()
Pull-Down Current at NSLP, AVG V() = 1 V...VDD
313
Vs()hi
Saturation voltage hi at SYN
Vs(SYN)hi = VSY − V(SYN), I() = -1 mA,
VSY = VDD, EP = TTL = hi, EN = open
314
Vs()lo
Saturation voltage lo at SYN
I() = 1 mA, VSY = VDD, TTL = hi, EP = lo,
EN = open
315
Isc()hi
Short-circuit Current hi at SYN
EP = TTL = hi, EN = open, V(SYN) = 0 V,
VSY = VDD
316
Isc()lo
Short-circuit Current lo at SYN
317
I(NERR)
318
Vs()lo
V() = 0...VDD − 1.2 V
Typ.
Max.
mV
5
µA
2
V
V
230
mV
-60
-2
µA
2
130
µA
0.4
V
0.4
V
-40
-3
mA
TTL = hi, EP = lo, EN = open, V(SYN) = VSY,
VSY = VDD
3
40
mA
Current in NERR
V(NERR) > 0.6 V, error
1
Saturation Voltage lo at NERR
I() = 1 mA, error
Laser Driver LDA, CI, IMON
401 Vs(LDA)hi Saturation Voltage hi at LDA
402
Idc(LDA)
Permissible DC Current in LDA
403
404
C(CI)
Required Capacitor at CI
|I(CI)|
Charge Current from CI
Vs(LDA)hi = V(VDDL) − V(LDA); RSI = 680 Ω
I(LDA) = 300 mA, VDD = 4.5...5.5 V
I(LDA) = 100 mA, VDD = 4.5...5.5 V
I(LDA) = 60 mA, RSI = 2.5 kΩ VDD = 3...3.5 V
1.6
1.2
0.8
20
mA
600
mV
2.2
2
1.3
V
V
V
-300
0
iC active, REGE = hi, V(VDD) − V(CI) = 1 V;
NCID = hi
NCID = lo
405
Ipu(CI)
Pull-Up Current in CI
iC active, REGE = NCID = lo, V(RSI) = VDD,
V(CI) = 0 V...VDD − 1 V
406
Imon()
Current at IMON
V(IMON)=0.5V;
I(LDA) < 100 mA, VDD = 3...4.5 V
I(LDA) < 300 mA, VDD = 4.5...5.5 V
mA
10
nF
20
0
60
µA
µA
-2.6
-0.3
µA
1/330
1/210
I(LDA)
Timing
501
twu
Time to Wakeup:
NSLP lo → hi to system enable
CVDDA = 1 µF, RSI = 1 kΩ
300
µs
502
tr
Laser Current Rise Time
VDD = 5 V see Fig. 2
1.5
ns
503
tf
Laser Current Fall Time
VDD = 5 V see Fig. 2
1.5
ns
504
tp
Propagation Delay
V(EPx, ENx) → I(LDAx)
VDD = 5 V
10
ns
ar y
n
i
im
prel
iC-NZP
P-TYPE LASER DIODE DRIVER
Rev B1, Page 7/15
ELECTRICAL CHARACTERISTICS: DIAGRAMS
I(LED)
tr
tf
I pk
V
90% I pk
Input/Output
VDD−0.45V
Vt()hi
Vt()lo
0.45V
1
t
10% I pk
t
0
Figure 1: Reference levels
Figure 2: Laser current pulse
ar y
n
i
im
prel
iC-NZP
P-TYPE LASER DIODE DRIVER
Rev B1, Page 8/15
DESCRIPTION OF FUNCTIONS
iC-NZP is a laser diode pulse driver, which features:
• Averaging or peak control
• Optical power or current control
• Laser current limitation
• Pulses of up to 155 MHz in controlled burst mode
• Sleep mode with less than 50 µA consumption
• Extension of the laser current with few external components
• Error signalling for overcurrent
OPTICAL POWER CONTROL
The iC-NZP supports the control of the laser diode’s
optical output power (APC) for all common laser diode
pin configurations (P, N and M). The control is enabled
with pin REGE set to high. With AVG set to low, the
peak power control is enabled. The laser power level
is selected by means of the resistor RMON (= RMD +
PMD). This control mode can be used for frequencies
up to ca. 4 Mhz. For higher frequencies the averaging control (AVG = high) or the burst mode have to be
used.
Tables 4 and 5 show how to set the inputs for laser
control depending on the input interface selected (TTL
or LVDS).
Laser control in TTL mode (TTL = high/open)
EP
EN
NSLP
REGE
SYN Mode
low/open Power-save mode
low/open open high
low VDDA charged, laser off
high
open high
high/open high VDDA charged, laser on, regulated
high
open high
low
high VDDA charged, laser on, burst mode
Table 4: Laser control in TTL mode
Laser control in LVDS mode (TTL = low)
EP
EN
NSLP
REGE
SYN
low/open < EN > EP high
low
> EN < EP high
high/open high
> EN < EP high
low
high
Mode
Power-save mode
VDDA charged, laser off
VDDA charged, laser on, regulated
VDDA charged, laser on, burst mode
Table 5: Laser control in LVDS mode
RMON dimensioning
Peak control (AVG = low): In order to calculate the right
value of RMON, the value of IM (monitor current with
respect to optical output power) of the laser diode must
be known. RMON must be chosen in a way that the
monitor current generated by the desired output power
creates a voltage drop across RMON of 250 mV (cf.
Electrical Characteristics No. 201).
Averaging control (AVG = high): In this mode the calculation is the same as in peak control, only the result
has to be divided by the duty cycle of the laser pulses,
D = Tτ . At a duty cycle of e.g. 50% D = 21 .
ar y
n
i
im
prel
iC-NZP
P-TYPE LASER DIODE DRIVER
Rev B1, Page 9/15
Control modes
Averaging Operation mode RMON calculation
AVG = 0
Peak control
RMON =
AVG = 1
Averaging control RMON =
V (MD)
IM
V (MD)
IM×D
Table 6: RMON dimensioning
Example
By way of example, an output level of 1 mW is to be
set. With an optical power of 1 mW e.g. laser diode
HL6342G has a typical monitor current (IM) of 15 µA.
The following value is then obtained for the resistor at
pin MD (RMON = PMD + RMD, where RMD is a fixed
resistor and PMD a potentiometer.):
RMON =
Best performance recommendations
The operating point for the laser diode is stored in an
on-chip capacitor. This permits a fast start-up but can
lead to an unstable control circuit under certain conditions such as inadequate PCB layout or laser with very
low monitor current. In that cases, an external capacitor is to be connected as close as possible to the chip,
across pin CI and CIS. This will prevent instability of
the control circuit. For averaging control a 10 nF capacitor at CI is recommended. Special care must be
taken in PCB layout when laying out the path from the
laser diode’s cathode to GND. This path must be kept
as short as possible to avoid parasitic inductances. A
snubber network across the laser diode also helps to
compensate for these parasitic inductances.
0.25 V
V (MD)
=
= 16.67 k Ω
IM
15 µA
External capacitor mode
In applications where an external capacitor is required
(see best performance recommendations below), the
external capacitor mode must be enabled (pin NCID =
low).
Figures 3, 4 and 5 show the typical set-up for the different P, N and M-type diode configurations.
P-Type diodes
RVDD
+3..+5.5V
VDD
CVDD
0.68.. 9kΩ
CVDDA
iC-NZP
LDA MONITOR
100 nF..
RSI
VDDA
i(RSI)x540
RSI
NSLP
100 nF..
VDDL
VDD
REGE
&
AVG
&
ECI
..10 nF..
VSY
SYN
EP
REF
LVDS/TTL
x280
CI
LDA
VDD
IMON
VDD
MD
TTL
NCID
OUTPUT DRIVER
P
NERR
OverTemp.
1
GND
..300mA
ECI
INPUT INTERFACE
T.PAD
GND
RMD
CI
+
+
EN
-
PMD
CIS
1
OverCurrent
Low V(LDA)
Bandgap, Reference, Overtemp
OUTPUT MONITOR
RGND
Figure 3: Circuit example for P-type laser diodes (case grounded)
ar y
n
i
im
prel
iC-NZP
P-TYPE LASER DIODE DRIVER
Rev B1, Page 10/15
M-Type diodes
RVDD
+3..+5.5V
VDD
CVDD
i(RSI)x540
RSI
NSLP
0.68.. 9kΩ
REGE
CVDDA
iC-NZP
LDA MONITOR
100 nF..
RSI
VDDA
100 nF..
VDDL
VDD
&
AVG
CIS
1
&
ECI
..10 nF..
VSY
EP
REF
LVDS/TTL
CI
x280
+
+
EN
CI
-
SYN
LDA
-
..300mA
IMON
VDD
TTL
MD
VDD
NCID
M
ECI
OUTPUT DRIVER
INPUT INTERFACE
NERR
RMD
OverTemp.
OverCurrent
1
GND
Bandgap, Reference, Overtemp
Low V(LDA)
T.PAD
GND
OUTPUT MONITOR
PMD
RGND
Figure 4: Circuit example for M-type laser diodes (case grounded)
will be coupled directly to pin MD due to monitor photo
diode’s internal capacitance. Thus making an accurate
control much more difficult.
N-Type diodes
Although this type of laser diodes are supported by
iC-NZP, it’s strongly recommended to use iC-NZN instead, since in this configuration all the pulses at LDA
RVDD
+3..+5.5V
VDD
CVDD
0.68.. 9kΩ
CVDDA
iC-NZP
LDA MONITOR
100 nF..
RSI
VDDA
i(RSI)x540
RSI
NSLP
100 nF..
VDDL
VDD
REGE
&
AVG
CIS
1
&
ECI
..10 nF..
VSY
SYN
EP
REF
LVDS/TTL
CI
CI
x280
+
+
EN
-
LDA
-
..300mA
IMON
VDD
TTL
MD
VDD
NCID
N
ECI
INPUT INTERFACE
OUTPUT DRIVER
NERR
RMD
OverTemp.
1
GND
T.PAD
GND
OverCurrent
Low V(LDA)
Bandgap, Reference, Overtemp
OUTPUT MONITOR
PMD
RGND
Figure 5: Circuit example for N-type laser diodes
iC-NZP
P-TYPE LASER DIODE DRIVER
ar y
n
i
im
prel
Rev B1, Page 11/15
LASER CURRENT LIMITATION
iC-NZP monitors the average laser current flowing
from pin VDDA (Figure 6). The DC current limit is set
by means of a resistor at pin RSI.
RSI @ VDD
VDDA
VDD
CVDDA
CVDD
i(RSI)x540
RSI
RSI
100 nF..
0.5V
When dimensioning resistor RSI the following applies
(cf. Electrical Characteristics No. 107):
-
VDD-0.5V
0.68..9 kΩ
+
100 nF..
Imax (VDDA) = 540 ×
0.5 V
RSI
NSLP
NERR
Overcurrent
1
OverTemp.
Figure 6: iC-NZP VDDA current limitation
If no current limitation is required, pin RSI must be connected to VDD to disable this feature.
Short pulses at VDDA with higher currents are possible as only the DC current is monitored and capacitor
CVDDA supplies the current for short pulses.
BURST MODE
In controlled burst mode iC-NZP can pulse with up to
155 MHz. Controlled here means that a pre-set operating point is maintained during the burst phase.
Therefore an operating point is settled first, for which
pin REGE has to be high and the laser must be
switched on. Once the operating point has been
reached the laser can be switched off again. The operating point is stored in an on-chip capacitor and when
REGE is set to low, the burst mode is activated. The
pre-set operating point is maintained. To prevent the
laser current from rising due to residual currents, the
capacitor is discharged with a maximum of 150 nA (cf.
Electrical Characteristics No. 405). For a longer burst
mode, an external capacitor can be connected to pin
CI. As the capacitor is discharged gradually, the output level must be re-settled again after a certain period,
depending on the admissible degradation of the laser
output power.
CURRENT CONTROL
The iC-NZP also supports laser current control, when
no monitor diode is present. For that purpose, a fraction of the current flowing trough the laser is provided
at IMON pin (ILDA / 280, cf. Electrical Characteristics
No. 406). The laser current is set by means of resistor
RMON (= RMD + PMD).
RMON =
V (MD)
IMON
Figure 7 shows the typical set-up for current control.
External capacitor mode
In applications where an external capacitor is required
(see best performance recommendations below), the
external capacitor mode must be enabled (NCID pin
set to low).
Best performance recommendations
The operating point for the laser diode is stored in an
on-chip capacitor. This permits a fast start-up but can
lead to an unstable control circuit under certain conditions such as inadequate PCB layout or laser with very
low monitor current. In that cases, an external capacitor is to be connected as close as possible to the chip,
across pin CI and CIS. This will prevent instability of
the control circuit.
Setting AVG to hi, keeps the control loop always on
and settled, thus improving the dynamic performance.
ar y
n
i
im
prel
iC-NZP
P-TYPE LASER DIODE DRIVER
Rev B1, Page 12/15
Special care must be taken in PCB layout when laying
out the path from the laser diode’s cathode to GND.
This path must be kept as short as possible to avoid
parasitic inductances. A snubber network across the
laser diode also helps to compensate for these parasitic inductances.
RVDD
+3..+5.5V
VDD
CVDD
i(RSI)x540
RSI
NSLP
0.68.. 9kΩ
REGE
CVDDA
iC-NZP
LDA MONITOR
100 nF..
RSI
VDDA
100 nF..
VDDL
VDD
&
AVG
CIS
1
&
ECI
..10 nF..
VSY
SYN
EP
REF
LVDS/TTL
CI
x280
+
+
EN
-
CI
LDA
-
..300mA
IMON
VDD
TTL
MD
VDD
NCID
ECI
INPUT INTERFACE
OUTPUT DRIVER
RMD
NERR
OverTemp.
1
GND
T.PAD
GND
OverCurrent
Low V(LDA)
Bandgap, Reference, Overtemp
OUTPUT MONITOR
PMD
RGND
Figure 7: Example set-up for current control
SLEEP MODE
The iC-NZP has a very low consuption mode that permits hibernation in battery powered applications. Setting the NSLP pin to low drives the chip into a state
where the VDDA pin is disconnected as supply and
pulled down. The wake up from sleep time is about
300 µs
R4
opt
19 RSI
1 VDD
U1
iC-NZP
11 J1-LVDS_N
9 J1-LVDS_P
3 J1-TTL
1
2
3
1
2
JP11
JP6
CEXT
GND
2
21 GND
23 NERR
NERR
VDD
+
-
&
1
Low V(LDA)
OverTemp.
OverCurrent
INPUT INTERFACE
LVDS/TTL
VDD
LDA MONITOR
i(RSI)x540
1
OUTPUT DRIVER
x280
OUTPUT MONITOR
Bandgap, Reference, Overtemp
SUB
EPAD
REF
&
iC-NZP
RGND 11
MD 3
IMON 4
LDA 13
CI 14
VDDL 16
CIS 15
VDDA 17
RVDD 12
C
1
N-Type
M-Type
ACC
JP1
R5
opt
3
3
P-Type
(default)
2
L
R
10K
P1
R1
5.1k
2
R6
opt
100nF
C3
(default)
ACC APC
JP2 1
IMON
CI
opt
10nF
CIS
1
JP3
C6
2
C5
3
(default)
D1
opt
C4
2
1
LDC
LDAMDC
3
P
C8
opt
D2
R7
opt
GND1
VDDL
1
2
2
1
3
LDC MDA
LDA
3
LDC MDA
LDA
N
M
MD
LDA
P-TYPE LASER DIODE DRIVER
GND2
5 NCID
8 TTL
7 EN
6 EP
10 SYN
9 VSY
NCID
TTL
EN
EP
SYN
VSY
18 AVG
JP10
LVDS
R2
2.74k
JP4
ILIM
OFF
AVG
JP9
BURST
JP7
ON
20 REGE
JP8
AVG
REGE
100nF
C7
JP5
12 J1-GND6
D3
RD
R3
1k
22 NSLP
JP12
opt
NSLP
3
C1
100nF
C2
VDD
10 J1-GND5
8 J1-GND4
5 J1-GND3
4 J1-GND2
2 J1-GND1
1 J1-GND
7 J1-V5D1
6 J1-V5D
iC-NZP
ar y
n
i
im
prel
Rev B1, Page 13/15
EVALUATION BOARD
iC-NZP comes with an evaluation board for test purpose. Figures 8 and 9 show both the schematic and the
component side of the evaluation board.
Figure 8: Schematic of the evaluation board
iC-NZP
P-TYPE LASER DIODE DRIVER
ar y
n
i
im
prel
Rev B1, Page 14/15
Figure 9: Evaluation board (component side)
iC-Haus expressly reserves the right to change its products and/or specifications. An info letter gives details as to any amendments and additions made to the
relevant current specifications on our internet website www.ichaus.de/infoletter; this letter is generated automatically and shall be sent to registered users by
email.
Copying – even as an excerpt – is only permitted with iC-Haus’ approval in writing and precise reference to source.
iC-Haus does not warrant the accuracy, completeness or timeliness of the specification and does not assume liability for any errors or omissions in these
materials.
The data specified is intended solely for the purpose of product description. No representations or warranties, either express or implied, of merchantability, fitness
for a particular purpose or of any other nature are made hereunder with respect to information/specification or the products to which information refers and no
guarantee with respect to compliance to the intended use is given. In particular, this also applies to the stated possible applications or areas of applications of
the product.
iC-Haus conveys no patent, copyright, mask work right or other trade mark right to this product. iC-Haus assumes no liability for any patent and/or other trade
mark rights of a third party resulting from processing or handling of the product and/or any other use of the product.
As a general rule our developments, IPs, principle circuitry and range of Integrated Circuits are suitable and specifically designed for appropriate use in technical
applications, such as in devices, systems and any kind of technical equipment, in so far as they do not infringe existing patent rights. In principle the range of
use is limitless in a technical sense and refers to the products listed in the inventory of goods compiled for the 2008 and following export trade statistics issued
annually by the Bureau of Statistics in Wiesbaden, for example, or to any product in the product catalogue published for the 2007 and following exhibitions in
Hanover (Hannover-Messe).
We understand suitable application of our published designs to be state-of-the-art technology which can no longer be classed as inventive under the stipulations
of patent law. Our explicit application notes are to be treated only as mere examples of the many possible and extremely advantageous uses our products can
be put to.
iC-NZP
P-TYPE LASER DIODE DRIVER
ar y
n
i
im
prel
Rev B1, Page 15/15
ORDERING INFORMATION
Type
Package
Order Designation
iC-NZP
QFN24 4 mm x 4 mm
Evaluation Board
iC-NZP QFN24
iC-NZP EVAL NZP1D
For technical support, information about prices and terms of delivery please contact:
iC-Haus GmbH
Am Kuemmerling 18
D-55294 Bodenheim
GERMANY
Tel.: +49 (61 35) 92 92-0
Fax: +49 (61 35) 92 92-192
Web: http://www.ichaus.com
E-Mail: [email protected]
Appointed local distributors: http://www.ichaus.com/sales_partners